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Research Article
Additions to the South African sea anemone (Cnidaria, Actiniaria) fauna, with expanded distributional ranges for known species
expand article infoMegan C. Laird, Charles L. Griffiths
‡ University of Cape Town, Cape Town, South Africa
Open Access

Abstract

The last monograph on South African sea anemones was published by Carlgren more than 75 years ago. Since that time, very little taxonomic research has been undertaken on this group and only seven additional species have been added to the regional fauna. In this study we document the history of taxonomic research and of species discovery for the South African anemone fauna, report on further additions to the fauna, and document expanded distributional ranges of known species. This study presents data from our own collections, as well as from the examination of historical data and museum collections, and from photographic records and specimens collected by SCUBA divers. Based on these data, two newly-discovered, but still un-described species, along with 12 new records, are added to the list of South African sea anemones. In addition, the ranges of 39 previously-known species are expanded. These new discoveries raise the total number of Actiniaria and Corallimorpharia species recognised from South African waters to 63.

Keywords

Anemone, Actiniaria, South Africa, species list

Introduction

The first anemone record from South African waters was Actinia capensis in 1830, now accepted as Bunodosoma capense (Lesson, 1830). No further new discoveries that remain valid today were made until 1857, when Cystiactis reynaudi, now called Bunodactis reynaudi, was described from the Cape of Good Hope (Milne Edwards 1857). Verrill (1865, 1867, 1869) then described three new species, now called Haloclava capensis, Corynactis annulata and Anthothoe stimpsonii. This was followed by the description of Anthopleura michaelseni by Pax (1926) and by the addition of 10 species collected during the German deep-sea expedition on the steamer “Valdivia” two years later (Carlgren 1928a). In 1938, Carlgren made what has been the most significant contribution to South African Actiniarian systematics to date, by recording an additional 23 species from the region (Carlgren 1938) in his ‘Monograph of South African Actiniaria and Corallimorpharia’ and raising the total number of South African actiniaria up to 41 species.

Following Carlgren’s work, more than 40 years passed without any additional species being added to the anemone fauna, after which Dunn (1981) mentioned the presence of three tropical species, Entacmaea quadricolor, Heteractis magnifica and Stichodactyla mertensii in South Africa and England and Robson (1984) discovered Preactis millardae. This was followed by reports of two alien introductions in the region - Metridium senile from Cape Town Harbour, Table Bay (Griffiths et al. 1996) and Sagartia ornata from Saldanha Bay (Acuña et al. 2004). Subsequent to this, Schama et al. (2012) found that South African representatives of the species long known as ‘Actinia equina’ in fact represented an un-described, endemic species, which they named Actinia ebhayiensis. Finally, in the most recent addition to the fauna, Daly et al. (2012) described Edwardsia isimangaliso from Lake St Lucia.

Apart from these few taxonomic studies and a review of the species richness, endemicity and distribution patterns of the anemone fauna by Acuña and Griffiths (2004), no recent work has been undertaken on the South African sea anemones, resulting in an underestimation of both the richness of South African fauna and the distributional ranges of known species. In this study we contribute to the rectification of these shortcomings by collating an assortment of new data from museum collections, trawl surveys, SCUBA collected records, and our own field surveys to add both new anemone species to the South African fauna and to better document the true distributional ranges of existing species.

Material and methods

During three intensive sampling trips around South Africa, animals were gathered for examination from the east, south and west coasts. Areas mentioned in the text are displayed on a map in Figure 1.

Figure 1.

Map of South Africa showing places mentioned in the text: 1 St Helena Bay 2 Cape Columbine 3 Saldanha Bay 4 Langebaan Lagoon 5 Table Bay 6 Sea Point 7 Oudekraal 8 Kommetjie 9 Cape of Good Hope 10 False Bay 11 Cape Hangklip, and 12 Bhanga Nek (Mozambique border).

Anemones were collected from the rocks using a specialised scraper tool, relaxed using 5 ml of menthol crystals placed into sea water, and fixed in formalin. After three days, the formalin was replaced with 70% ethanol. Two collection methods were used during these surveys: collection off rocks exposed during spring low tide and collection from up to 30 m depth by SCUBA divers. As collection permits for Sodwana Bay and Rocktail Bay were not granted for this study, due to the value of these anemones to the SCUBA diving ecotourism industry, only photographic records were obtained in these areas. Following identification of wet material, all specimens were deposited in the Iziko South African Museum (SAM) marine invertebrate collection, along with digital copies of photographs and an Excel database containing details of all records. Synonymy lists were adapted from Hexacorallians of the World (Fautin 2013).

Additional datasets from previous rocky shore intertidal surveys around South Africa were generously provided by Dr Kerry Sink and Dr Angela Mead, and photographic records provided by recreational SCUBA divers were also included where the species could be identified with confidence. Additional specimens examined for this study included previously unexamined specimens from the Iziko South African Museum (SAM) collection, which included specimens collected by the University of Cape Town (UCT) Ecological Survey and specimens collected by the Department of Agriculture, Forestry and Fisheries (DAFF) during routine deep-sea trawl surveys.

Attached to the locality data are depth records, enabling a depth range to be determined for each species. For the purposes of this study, the west coast was defined as stretching from the Namibian border to Cape Point, the south coast as stretching eastwards from Cape Point to the Mbashe River in the Transkei, and the east coast as stretching from the Mbashe River northwards to the Mozambique border.

Results

History of discovery

Figure 2 shows a timeline of the numbers of Actiniarian and Corallimorpharian species recorded from South Africa over the last two centuries. The enormous contributions made by Carlgren (1928a, 1938) are particularly striking, as is the very low level of taxonomic activity over the subsequent decades until present. Fourteen species new to South Africa were recorded during this study, including two new species currently undergoing description, making this the most significant contribution in terms of expansion of the fauna list since the monograph of Carlgren (1938). Following this study, the total number of Actiniaria and Corallimorpharia species recognised from South African waters is raised to 63.

Figure 2.

The number of species recorded from South Africa between 1830 and 2015.

New additions to the fauna

The samples and data sources examined resulted in the addition of 14 anemone species to the South African fauna. These comprise two species new to science, both of which are currently being formally described elsewhere, plus 12 species new to the region. The following account summarises the previously known range of each of these species, details where South African specimens were found, mentions similar species known from South Africa, and lists museum specimens and selected photographs of each of the new species recorded.

Table 1 summarises the specimen and photographic data for each of the new records. Five of these new records are based on photographic evidence, while specimens exist for the remaining seven.

Selected specimen and photographic records of the 12 species recorded in South Africa for the first time. Records based on photographs are only listed if no specimens are available. ‘Cat #’ refers to the category number of the specimen lodged in SAM, ‘Station #’ refers to the site where the specimens were collected and ‘Photograph #’ refers to the file name of the photograph lodged at SAM.

Species Cat # Date Latitude Longitude Coast Station # Depth Photograph #
Actinoscyphia plebeia H5181 31/01/2011 31°09'44.16"S 15°37'22.68"E West 31427 653 Actinostola capensis_Groen River_1–2
Actinoscyphia plebeia H5179 31/01/2011 31°09'44.16"S 15°37'22.68"E West 31427 427
Actinoscyphia plebeia H5178 24/01/2011 32°36'43.14"S 16°29'30.42"E West 31399 811 Actinostola capensis_Columbine_1
Peachia parasitica H5202 27/10/2011 33°50'11.03"S 18°25'42.52"E West TB01 2 Peachia parasitica_Table Bay_1–3
Peachia sp. H5385 29/03/2002 33° 7'17.26"S 18° 3'06.57"E West 1
Peachia sp. 33°58'53.43"S 25°40'05.51"E South 8 Peachia sp._Philips Reef_1
Peachia sp. 34° 2'34.89"S 25°38'30.92"E South 18 Peachia sp._Scotsmans Reef_1-2
Pseudactinia sp. H5588 11/03/2008 33°59'05.82"S 25°51'46.44"E South SAF110A 20 Pseudactinia sp. n._Riy Banks_1-5
Pseudactinia sp. H5599 11/03/2008 33°59'04.14"S 25°51'50.46"E South SAF112B 17 Pseudactinia sp. n._Riy Banks_7-9
Megalactis griffithsi 28/07/2008 27° 5'53.18"S 32°50'39.91"E East 18 Megalactis griffithsi_Pineapple Reef_1
Megalactis griffithsi 07/12/2003 27°30'38.23"S 32°42'20.54"E East 20 Megalactis griffithsi_Sodwana Bay_1
Alicia sansibarensis H5158 25/04/2004 27°27'30.00"S 32°43'34.80"E East Jago 811 105 Alicia sansibarensis_White Sands_1-2
Triactis producta 01/07/2011 30°14'60.00"S 30°49'00.00"E East 30 Triactis producta_Aliwal Shoal_1-3
Heteractis aurora H5401 08/04/2002 27°36'22.08"S 32°39'48.96"E East D12 12
Heteractis aurora H5467 06/10/2009 27°27'02.74"S 32°49'22.08"E East RR2 22 Heteractis aurora_Ribbon Reef_1-2
Heteractis crispa H5469 05/10/2009 27°19'03.03"S 32°50'17.08"E East AR1 15 Heteractis crispa_Antons Reef_1-2
Heteractis malu 30/07/2008 27° 7'02.21"S 32°50'46.34"E East 15 Heteractis malu_Aerial Reef_1-2
Heteractis malu 13/01/2004 27°30'38.23"S 32°42'20.54"E East 20 Heteractis malu_Sodwana Bay_1
Stichodactyla haddoni 12/01/2005 27°30'10.63"S 32°42'16.62"E East 14 Stichodactyla haddoni_Bikini Reef_1
Stichodactyla haddoni 11/05/2004 27°30'38.23"S 32°42'20.54"E East 17 Stichodactyla haddoni_Devils Peak_1-4
Stichodactyla haddoni 14/04/2005 27°30'38.23"S 32°42'20.54"E East 20 Stichodactyla haddoni_Sodwana Bay_1
Cryptodendrum adhaesivum 27°30'38.23"S 32°42'20.54"E East 10 Cryptodendrum adhaesivum_Sodwana_1
Cryptodendrum adhaesivum 27°30'38.23"S 32°42'20.54"E East 15 Cryptodendrum adhaesivum_Sodwana_2

Species new to science

Family Halcampidae Andres, 1883

Genus Halianthella Kwietniewski, 1896

Halianthella sp. n

Fig. 3A

Figure 3.

The two new species of sea anemone reported in this study: A Halianthella sp. n. (3 mm) and B Anthostella sp. n. (10 mm). Photographs taken by Guido Zsilavecz (A) and Megan Laird (B).

This very tiny species was discovered by Helen and Guido Zsilavecz while diving at 15 m in False Bay, near Cape Point. Specimens were sent to Dr Estefanía Rodríguez, assistant curator of the American Museum of Natural History, who is in the process of describing this material as a new species in the genus Halianthella. This species is thus referred to here as Halianthella sp. n., and it is known to SCUBA divers as the ‘clown anemone’.

Family Actiniidae Rafinesque, 1815

Genus Anthostella Carlgren, 1938

Anthostella sp. n

Fig. 3B

The second new species, known to divers as the ‘dwarf spotted anemone’, was first collected by Prof. Charles Griffiths from Oudekraal. This species is referred to here as Anthostella sp. n. as the formal publication of the description by Dr Estefanía Rodríguez and Dr Megan Laird is still pending.

Species newly reported from South Africa

Family Actinoscyphiidae Stephenson, 1920

Genus Actinoscyphia Stephenson, 1920

Actinoscyphia plebeia (McMurrich, 1893)

Fig. 4A

Figure 4.

Six of the twelve species recorded from South Africa for the first time: A Actinoscyphia plebeia (20 mm) B Peachia paracitica (2 mm) C Peachia sp. (20 mm) D Pseudactinia sp. (10 mm) E Megalactis griffithsi (10 mm) and F Alicia sansibarensis (20 mm). Photographs taken by Dr Lara Atkinson (A), Dr Megan Laird (B, E), Andre Aggenbach (C), Dr Bernard Picton (D) and Dr Kerry Sink (F).

Actinernus plebeius McMurrich, 1893: 165–167, pl. 24, figs 42–45; Carlgren 1896: 174; Gravier 1918: 6–7; 1922: 31–32

Actinoscyphia plebeian: Fautin 1984: 37–40; Rodríguez 2012: 215

This species is previously known from Antarctica, Chile and the South Georgia Islands off Argentina. The addition of this species to the South African fauna is based on multiple trawl records from both the west and south coasts of South Africa collected by the Department of Agriculture, Forestry and Fisheries (DAFF) during annual trawl surveys. According to available records, it was first found in 2007 on the Agulhas Bank, but those specimens remained unidentified until this study. Three specimens are lodged in the Iziko South African Museum (SAM): H5181, H5179 and H5178 (Table 1) and additional records are based on trawl data with no supporting specimens. The distribution range of this species extends from Kleinzee on the west coast to the Agulhas Bank on the south coast, between 128–866 m depth. Actinoscyphia plebeia is distinguishable from Actinostola capensis, another deep-sea species found in the same area off the coast of South Africa, by the maroon coloration of its tentacles and oral disc, its smooth column and its slimy texture.

Family Haloclavidae Verrill, 1899

Genus Peachia Gosse, 1855

Peachia parasitica (Agassiz, 1859)

Fig. 4B

Bicidium parasiticum Agassiz, 1859: 23–24

Peachia parasitica: Verrill 1866: 338–339, 343; McDermott et al. 1982: 319–321

Previously known from east and west coasts of North America, as well as from the east coast of Greenland. The addition of this species to the South African fauna is based on a single specimen collected by Dr. Deborah Robertson-Andersson in 2011. The anemone was collected from Table Bay during a boat-based expedition targeting the collection of jellyfish. The juvenile was found attached to the underside of the medusa of the jellyfish Chrysaora fulgida. This specimen is lodged in SAM with catalogue number H5202 (Table 1). Peachia parasitica is distinguishable from Peachia sp. (below) by the unmarked tentacles and oral disc of the former, as well as the tendency of juveniles to live as parasites.

Peachia sp

Fig. 4C

Due to a lack of well-preserved samples, it was not possible to determine the specific name of this anemone, thus the previous range is unknown. The addition of this species to the South African fauna is based on a single specimen found in 1 m of water and collected from Langebaan Lagoon in 2002. Two additional photographic records of this species exist, both from Port Elizabeth on the south coast, between 8–18 m depth. The specimen is lodged in SAM with catalogue number H5385 (Table 1). Peachia sp. is distinguishable from Peachia parasitica by the unmistakable chevron patterns on the tentacles.

Family Actiniidae Rafinesque 1815

Genus Pseudactinia Carlgren, 1928b

Pseudactinia sp

Fig. 4D

As it was not possible to determine the specific name of this anemone, the previous range is unknown. The addition of this species to the South African anemone fauna is based on two specimens collected from Algoa Bay in 2008, as well as 34 photographic records from the south coast. The distributional range of this species is recorded from False Bay to Aliwal Shoal from 1–29 m depth. The two specimens are lodged in SAM: H5588 and H5599 (Table 1) and additional records are based on photographic records collected by recreational SCUBA divers. Photographic records are not listed in Table 1 and are obtainable from SAM. Pseudactinia sp. is large and has a very wide oral disc, like that of P. flagellifera, but has only one row of vesicles, while P. flagellifera has up to five. Pseudactinia varia is much smaller than Pseudactinia sp., but also has one row of vesicles. Pseudactinia sp. is unique in that the column is often mottled and the oral disc is striped. The distinction between species is not purely morphological, but is also based on molecular studies (Heestand 2009).

Family Actinodendronidae Haddon, 1898

Genus Megalactis Hemprich & Ehrenberg, 1834 in Ehrenberg, 1834

Megalactis griffithsi Saville-Kent, 1893

Fig. 4E

Megalactis griffithsi Saville-Kent, 1893: 35, 147; Carlgren 1896: 175; 1949: 68; Haddon 1898: 399, 493–494; Stephenson 1922: 295; Uchida et al. 1975: 34–35; Fautin 1988: 25; Ardelean and Fautin 2004: 488, 491, 494, 500–501

This species is previously known from the area around Melanesia, Polynesia and Micronesia. The addition of this species to the South African fauna is based on two photographic records, one from Sodwana Bay and the other from Rocktail Bay. Megalactis griffithsi was first recorded in 2003 (Table 1) and is know from depths of 18–20 m. The original photograph remained unidentified until this species was again encountered during a research dive that formed part of this study in 2008. Although the specimen was not collected, it was possible to observe the behaviour of the anemone, and based on this, as well as the external morphology visible in photographs, the species name was determined. Megalactis griffithsi is distinguishable from Actinodendron hansingorum and other species of the genus by the alternating dark and light areas between each segment of the oral disc. The number of secondary branches on the tentacles also does not exceed 35 in number (Ardelean and Fautin 2004).

Family Aliciidae Duerden, 1895

Genus Alicia Johnson, 1861

Alicia sansibarensis Carlgren, 1900

Fig. 4F

Alicia sansibarensis Carlgren, 1900: 28–30; Parulekar 1990: 219–220, 223, 225; Pax 1909: 402; Stephenson 1922: 280; Carlgren 1927b: 444; 1949: 43

This species was previously considered endemic to Zanzibar. The addition of this species to the South African fauna is based on one specimen from Sodwana Bay collected from 105 m depth in 2004. This specimen remained unidentified until now due to a lack of taxonomic expertise. The anemone is lodged in SAM with catalogue number H5158 (Table 1). Alicia sansibarensis is distinguishable from Triactis producta, the only other species of the family Aliciidae found in South Africa, by the division of the column of A. sansibarensis into a scapus and a capitulum. The tentacles of A. sansibarensis are very long and snake-like, while those of T. producta are short.

Genus Triactis Klunzinger, 1877

Triactis producta Klunzinger, 1877

Fig. 5A

Figure 5.

Six of the twelve species recorded from South Africa for the first time: A Triactis producta (30 mm) B Heteractis aurora (50 mm) C Heteractis crispa (50 mm) D Heteractis malu (40 mm) E Stichodactyla haddoni (100 mm) and F Cryptodendrum adhaesivum (150 mm). Photographs taken by Dr Megan Laird (A–C, F), Christo Van Jaarsveld (D) and Dr Kerry Sink (E).

Triactis producta Klunzinger, 1877: 85–86, pl. 6, fig. 8; Carlgren 1947: 14; 1949: 44. Fishelson 1970: 107–108, fig. 5; Fautin et al. 2008: 39–40, 51–52

Hoplophoria cincta Haddon, 1898: 398, 438–439; pl. 23, figs 11–15; Carlgren 1947: 14

Triactis cincta: Carlgren 1945: 7; 1949: 44; 1950: 427, 433

This species is previously known from across most of the Indo-Pacific. The addition of this species to the South African fauna is based on one photographic record from a 30 m dive at Aliwal Shoal in 2011 (Table 1). It was possible to determine the species of the anemone conclusively based on external morphology visible in photographs. This anemone is unique in that it possesses pseudotentacles that function to maximise photosynthesis by zooxanthellae. Triactis producta is distinguishable from Alicia sansibarensis by the presence of bifurcated stalked outgrowths protruding from mid-column.

Family Stichodactylidae Andres, 1883

Genus Heteractis Milne Edwards & Haime, 1851

Heteractis aurora (Quoy & Gaimard, 1833)

Fig. 5B

Actinia aurora Quoy & Gaimard, 1833: 141–142, pl. 12, fig. 1–4

Heteractis aurora: Milne Edwards 1857: 261; Carlgren 1949: 108; Dunn 1981: 39–40, 56–66, 105, 107–108; Hirose 1985: 114, 116–121, 123–125; Cutress and Arneson 1987: 54, 55, 57, 59, pl. 2, fig. 2f; England 1988: 45–54; Badsha 1991: 139–144; den Hartog 1994: 75, 77–78

Antheopsis koseirensis England, 1987: 207, 273, 276

Bunodes koseirensis: England 1988: 53

This species is previously known from across most of the Indo-Pacific. The addition of this species to the South African fauna is based two specimens from Sodwana Bay. The first specimen was found in 2002, but remained unidentified until the collection of the second specimen in 2009. Subsequently, numerous sightings have been reported between depths of 12–15 m, with one sighting at Aliwal Shoal. The two specimens are lodged in SAM: H5401 and H5467 as shown in Table 1; with six additional photographic records not listed here, but obtainable from the SAM database. Heteractis aurora is distinguishable from other species of the genus by the ‘beaded’ tentacles formed by swellings along their length.

Heteractis crispa (Hemprich & Ehrenberg in Ehrenberg, 1834)

Fig. 5C

Actinia Entacmaea crispa Ehrenberg, 1834: 260, pl. 8, fig. 1

Entacmaea crispa Carlgren, 1899: 14

Heteractis crispa Dunn, 1981: 47–57, 65, 71. Hirose 1985: 114, 116–125. Fautin 1986: 172–173, 179. Richardson et al. 1997: 60–65. Hattori 2006: 51–56. Scott and Harrison 2007a: 163–169; 2007b: 110–119; 2008: 833–838. Fautin et al. 2009: 121, 123, 134–135, 136, 139, 140

Heteractis macrodactylum Cutress & Arneson, 1987: 54–55, 57, 59, pl. 2, fig. 2d

Radianthus crispus Uchida & Soyama, 2001: 91, 151, 155

The range of this species extends across most of the Indo-Pacific. The addition of Heteractis crispa to the South African fauna is based on one specimen from Sodwana Bay found during a field survey for this study in 2009. This specimen is lodged in SAM with catalogue number H5469 (Table 1). The seven photographic records are obtainable from the SAM database. The distributional range of this species in South Africa is from Aliwal Shoal to Rocktail Bay, between 15–22 m depth. Heteractis crispa is distinguishable from other species of the genus by the frosted stripes on each tentacle and the thick, leathery column.

Heteractis malu (Haddon & Shackleton, 1893)

Fig. 5D

Discosoma Malu Haddon & Shackleton, 1893: 117, 120

Heteractis malu Dunn, 1981: 35, 40, 47, 57, 66–71, 104, 107–108

Radianthus malu England, 1988: 53

This species is previously known from across most of the Indo-Pacific. The addition of Heteractis malu to the South African fauna is based on two photographic records from Sodwana Bay from 15–20 m, with the first taken by a SCUBA diver in 2004 (Table 1). The species was encountered again during a field survey for this study in 2008. Although the anemone was not collected, it was possible to conclusively determine the species based on external morphology visible in photographs. They show adhesive verrucae on the column, as well as short, sparse tentacles (Fautin et al. 2008).

Genus Stichodactyla Brandt, 1835

Stichodactyla haddoni (Saville-Kent, 1893)

Fig. 5E

Discosoma Haddoni Saville-Kent, 1893: 32–33. Carlgren 1896: 174

Stichodactyla haddoni Dunn, 1981: 82–91. Fautin and Allen 1992: 40–41. Fautin et al. 2009: 133

The range of this species extends across most of the Indo-Pacific. The addition of Stichodactyla haddoni to the South African fauna is based on three photographic records from Sodwana Bay in 14–20 m of water. The anemone was first recorded by a SCUBA diver in 2004, with two additional photographs taken in 2005 (Table 1). No South African specimens of this anemone are housed in SAM; however, a specimen from just north of the Mozambique border is in the museum collection. As this is a large anemone, it was possible to determine the species based on external morphology visible in photographs. Stichodactyla haddoni is usually easily distinguishable from S. mertensii, as S. haddoni is usually found in sand, has a weakly adherent pedal disc, has extremely sticky tentacles, has a column that is unable to contract completely, and has a maximum oral disc diameter of 500 mm. In contrast, S. mertensii is found attached to coral reef, has an extremely adhesive pedal disc, has non-adherent tentacles, is able to slowly contract into crevices (Fautin and Allen 1997) and has a maximum oral disc diameter of 1500 mm.

Family Thalassianthidae Milne Edwards, 1857

Genus Cryptodendrum Klunzinger, 1877

Cryptodendrum adhaesivum Klunzinger, 1877

Figure 5F

Cryptodendrum adhäsivum Klunzinger, 1877: 86

Cryptodendrum adhaesivum Haddon, 1898: 399, 483–484, pl. 25, figs 4–6, pl. 32, figs 5–6. Carlgren 1940b: 7, 32–34, figs 9,13; 1949: 70. Dunn 1981: 7–13. Cutress and Arneson 1987: 54, 55, 57, 59, pl. 2, fig. 2c. Richardson et al. 1997: 61–62, 64. Fautin 2009: 131–132, 140, fig. 11

This species is previously known from across most of the Indo-Pacific. The addition of this species to the South African fauna is based on two photographic records taken between 10–15 m at Sodwana Bay during SCUBA diving surveys for this study (Table 1). As this is a large anemone, it was possible to determine the species based on external morphology visible in photographs. C. adhaesivum is unlike other South African anemones, as it has two forms of tentacles: inner tentacles each with five branches at tip, and outer tentacles with a single bulb at tip (Fautin and Allen 1997).

Range expansion

Since the work of Carlgren (1938) and the distributional review by Acuña and Griffiths (2004), a large amount of distributional data for anemones has been collected. These data have been stored in museums and on online databases such as ‘Hexacorallians of the world’ (Fautin 2013), but these ranges have never before been collated and published.

The range expansion of Metridium senile is the most notable, as this is one of two alien anemone species known in South Africa. This species was first recorded in South Africa from the Table Bay Harbour (Griffiths et al. 1996) in September 1995, when a well-established colony was discovered. Anemones were attached to artificial substrata, such as car tyres, at a depth of 10–16 m, and it is thought that the species was introduced to South Africa via shipping from Europe (Griffiths et al. 1996). However, in February 2006, another population of M. senile was discovered at 115 m on the PetroSA pipeline on the Agulhas Bank (35°13'59.08"S, 21°29'53.44"E) by Dr Lara Atkinson. Individuals were morphologically identical to those of the Table Bay population and it was interesting to note that both populations were established on artificial structures. The size of each of these alien populations should be monitored annually to ensure that their range does not expand.

Other species for which range expansions have been detected since the work of Carlgren (1938) and Acuña and Griffiths (2004) are listed in Table 2. The distribution ranges of eight species were extended to the west, 18 species to the east, and 13 species to both the west and the east (Table 2). The fact that the ranges of so many species have been expanded, suggests that sea anemones around the South African coastline have been severely under-sampled in the past.

Discussion and conclusions

Since the writings of Carlgren (1927a, 1928a, 1938, 1940a, 1949), very little South African work has been done on the taxonomy of this group. The most recent species list available is that compiled by Acuña and Griffiths (2004), who reported 49 species of sea anemones from South Africa. Following extensive fieldwork and examination of unidentified anemones in the Iziko South African Museum (SAM) during the course of this study, the number of sea anemone species know from South Africa is hereby increased to 63. This number is high in comparison to the 30 species reported from the Faroe Islands (Fautin et al. 2005) and the 26 species from Galicia in north-western Spain (den Hartog and Ates 2011), but is on a par with the 63 species recorded from Chile (Häussermann 2006). The South African sea anemone fauna makes up over 5% of the total anemone species worldwide when compared to the species list published by Daly et al. (2007). An increase of 14 species in one country over a relatively short study suggests that many more anemone species are still to be found in South Africa. The ranges of 79% of the anemone species reported by Acuña and Griffiths (2004) were also expanded by this study. Gaps in sample coverage remain particularly obvious in deep-sea areas, particularly the bathyal (500–3500 m) and the abyssal (3500–5000 m), the latter being essentially completely unexplored. Geographically, the west and east coasts need to be more thoroughly sampled, while estuarine habitats also need to be made a priority.

Eight of the 14 species added to the fauna were found on the east coast, with seven discovered by SCUBA divers and one collected in a trawl. Two of the new additions were found on the west coast, one a shallow water species found burrowing in sand and the other a pelagic species found on the medusa of a jellyfish. Two of the new records were found on the south coast by SCUBA divers, and a further two species were found to inhabit areas extending from the west to the south coast, with one found by SCUBA divers and the other retrieved by a deep-sea trawl. All of the east coast records are tropical forms previously well known from the Indo-Pacific. The use of SCUBA divers as a collection method for sea anemones has resulted in the addition of 10 of the 14 new records. This method was not available to Carlgren, which probably explains why these species were missed by him. As they occur at depths of 2 m and deeper, they are beyond the reach of rocky shore researchers, while at the same time being too shallow, or occurring in reef habitats that could not be sampled using ship-borne equipment such as grabs, dredges and trawl nets. This emphasises the importance of recreational SCUBA divers in the discovery of new species within this and other groups that are abundant on shallow rocky reefs.

Previous distribution and depth ranges and updated distribution and depth ranges for each anemone species that experienced an alteration in range. References for previous records are listed. Species range expansions were classified as being to the west (W), the east (E) or to both the west and east (W&E). A dash (-) indicates species that were found to have increased depth ranges. See Figure 1 for site locations.

Species Previous records Updated records Exp. Reference
Location Depth Location Depth
Acontiophorum mortenseni Agulhas Bank 73–76 Hondeklip Bay to Transkei 73–775 W&E Carlgren 1938
Actinauge granulata Cape Point to Agulhas Bank 64–500 Port Nolloth to Agulhas Bank 64–657 W Carlgren 1938
Actinia ebhayiensis Port Nolloth to Durban 0 Port Nolloth to Durban 0–10 - Carlgren 1938
Actinostola capensis Table Bay to East London 168–500 Port Nolloth to Port Shepstone 81–100 W&E Carlgren 1938, Acuña and Griffiths 2004
Aiptasia parva East London ? East London to Sodwana Bay 1–45 E Carlgren 1938
Amphianthus capensis Agulhas Bank 155 Port Nolloth to Sodwana Bay 12–623 W&E Carlgren 1938
Amphianthus laevis Sea Point ? Hondeklip Bay to Port Elizabeth 36–457 W&E Carlgren 1938
Amphianthus natalensis Durban 804 Agulhas Bank to Sodwana Bay 1–804 W&E Carlgren 1938
Anemonia natalensis Durban to Cape Vidal 0–2 Durban to Sodwana Bay 0–2 E Carlgren 1938, Acuña and Griffiths 2004
Anthopleura anneae Durban 0 Langebaan Lagoon to St Lucia 0–15 W&E Carlgren 1940a
Anthopleura insignis Kleinmond to Port St John’s 0 Table Bay to Durban 0–29 W&E Carlgren 1940a
Anthopleura michaelseni Port Nolloth to Durban 0 Port Nolloth to Bhanga Nek 0–36 E Carlgren 1938
Anthosactis capensis Elands Bay to Cape Point 287 Hondeklip Bay to Sodwana Bay 12–498 W&E Carlgren 1938, Acuña and Griffiths 2004
Anthostella stephensoni Port Nolloth to Qolora 0 Port Nolloth to St Lucia 0–42 E Carlgren 1938, Acuña and Griffiths 2004
Anthothoe stimpsonii Port Nolloth to Durban 0–76 Port Nolloth to Durban 0–120 - Carlgren 1938
Bolocera kerguelensis Table Bay to East London 73–325 Port Nolloth to East London 16–750 W Carlgren 1938, Acuña and Griffiths 2004
Bunodactis reynaudi Port Nolloth to Durban 0 Port Nolloth to St Lucia 0–30 E Carlgren 1938
Bunodosoma capense Saldanha to Durban 0–27 Port Nolloth to Durban 0–100 W Carlgren 1938, Acuña and Griffiths 2004
Calliactis algoaensis Port Elizabeth 91 Port Elizabeth to Sodwana Bay 66–850 E Carlgren 1938
Calliactis polypus Durban to Mozambique ? False Bay to Mozambique 2–201 W Carlgren 1938, Acuña and Griffiths 2004
Condylanthus magellanicus Cape Point to Agulhas Bank 73–500 Cape Point to Agulhas Bank 73–500 - Carlgren 1938
Corynactis annulata Port Nolloth to Mossel Bay 0–73 Port Nolloth to East London 0–108 E Carlgren 1938, Acuña and Griffiths 2004
Edwardsia capensis False Bay 91 False Bay to Sodwana Bay 0–91 E Carlgren 1938
Entacmaea quadricolor Aliwal Shoal to Durban ? Aliwal Shoal to Sodwana Bay 14–18 E Acuña and Griffiths 2004
Gyractis sesere Port Edward to Durban 0 Port Edward to Sodwana Bay 0–20 E Carlgren 1938, Acuña and Griffiths 2004
Halcampa capensis False Bay 91 St Helena Bay & False Bay 12–91 W Carlgren 1938
Halcampaster teres East London 0–3 Sea Point to East London 0–11 W Carlgren 1938
Halcurias capensis Cape Town and Agulhas Bank 100–287 Cape Town to Cape Agulhas 25–349 E Carlgren 1938, Acuña and Griffiths 2004
Halianthella annularis Lamberts Bay to Kommetjie 0 Lamberts Bay to Richard’s Bay 0–79 E Carlgren 1938, Acuña and Griffiths 2004
Haloclava capensis False Bay 21 Lambert’s Bay to Port St John’s 0–170 W&E Carlgren 1938
Heteractis magnifica Durban ? Durban to Rocktail Bay 14–25 E Acuña and Griffiths 2004
Isanthus capensis Lamberts Bay to Cape Hangklip 0 Hondeklip Bay to Cape Hangklip 0–157 W Carlgren 1938, Acuña and Griffiths 2004
Isophellia algoaensis Port Elizabeth 40 Hondeklip Bay to East London 15–1240 W&E Carlgren 1938
Korsaranthus natalensis False Bay to Durban ? False Bay to Durban 0–32 - Carlgren 1938, Acuña and Griffiths 2004
Liponema multiporum Agulhas Bank 500 Hondeklip Bay to St Francis Bay 110–500 W&E Carlgren 1938
Litophellia octoradiata Durban 0 Durban 0 - Carlgren 1938
Metridium senile Table Bay 6–12 Table Bay & Mossel Bay 9–122 E Griffiths et al. 1996, Acuña and Griffiths 2004
Phellia aucklandica Oudekraal 0–1 Oudekraal 0–1 - Carlgren 1938
Phelliactis algoaensis Port Elizabeth 40 Cape Point & Port Elizabeth 40 W Carlgren 1938
Phelliactis capensis Cape Point 566–1024 Cape Point to St Lucia 560–1204 E Carlgren 1938
Preactis millardae Table Bay to False Bay 10 - 20 Table Bay to False Bay 0–32 - England and Robson 1984
Pseudactinia flagellifera Port Nolloth to Durban 0–45 Port Nolloth to St Lucia 0–102 E Carlgren 1938
Pseudactinia varia Oudekraal to East London 0–76 Cape Columbine to Durban 0–102 W&E Carlgren 1938
Rhodactis rhodostoma Durban 0 Durban to Sodwana Bay 0–20 E Carlgren 1938
Sagartia ornata Langebaan Lagoon 0 Langebaan & Saldanha Bay 0–56 - Acuña et al. 2004, Acuña and Griffiths 2004
Stichodactyla mertensii Durban ? Durban to Sodwana Bay 15–20 E Acuña and Griffiths 2004
Telmatactis natalensis Durban 0–1 Durban 0–1 - Carlgren 1938
Urticinopsis crassa Cape Point 566–1024 Hondeklip Bay to Agulhas Bank 143–1024 W&E Carlgren 1938

Acknowledgements

Thanks to the Department of Agriculture, Forestry and Fisheries (DAFF) for access to their invaluable trawl dataset and the Iziko South African Museum for access to historical records. Access was granted by the iSimangaliso Wetland Park, SANParks and Cape Nature to conduct fieldwork in their respective reserves. Specimen collection was carried out with a research collecting permit issued to Prof. Charles Griffiths jointly by DAFF and the Department of Environmental Affairs (DEA). This research was funded by a National Research Foundation (NRF) grant to Prof. Charles Griffiths, a South African National Biodiversity Institute (SANBI) scholarship awarded to Megan Laird, as well as a number of University of Cape Town bursaries.

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