Research Article |
Corresponding author: Sergei L. Zonstein ( znn@post.tau.ac.il ) Academic editor: Pavel Stoev
© 2016 Sergei L. Zonstein, Yuri M. Marusik, Mikhail M. Omelko.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Zonstein SL, Marusik YM, Omelko MM (2016) Redescription of the type species of Diaphorocellus Simon, 1893 (Araneae, Palpimanidae, Chediminae). African Invertebrates 57(2): 93-103. https://doi.org/10.3897/AfrInvertebr.57.9988
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The type species of Diaphorocellus Simon, 1893, the South African D. biplagiatus Simon, 1893, is redescribed, and the male is described for the first time. The species is diagnosed and figured in detail, including the copulatory organs of both sexes, previously undescribed for any species of the genus. New distributional data of D. biplagiatus are provided.
Taxonomy, Diaphorocellus biplagiatus , brush-footed spiders, endogyne, South Africa
Diaphorocellus Simon, 1893 is a small genus of palpimanid spiders with four species distributed in the Afrotropical region (
While resurrecting Diaphorocellus,
All genera in Chediminae were diagnosed by
Although
A male, recorded (but not described) by
It is notable that none of the species considered currently to be in the genus have illustrations of the endogyne or the male palp. Additionally, we were unable to find a detailed description of the very complex endogyne for any member of the subfamily. The existing more or less detailed figures given in
To revise the genus, we studied numerous specimens from South Africa and adjacent states identified as D. biplagiatus. Although specimens from all over the country and adjacent Botswana have the same abdominal pattern and size, we recognised that specimens from the Western Cape clearly differ from specimens from Botswana and the eastern provinces of South Africa by the palp and the endogyne. We consider specimens from the Western Cape Province to be D. biplagiatus, and those from other areas to be D. helveolus.
Specimens from the following spider collections were studied:
NCA
National Collection of
We examined over 40 specimens of D. biplagiatus and over a hundred specimens belonging to other species of Diaphorocellus. Although the number of specimens belonging to D. biplagiatus are high, they were collected in three localities only. In the “material examined” we list only selected samples containing males and females or samples from the exactly same locality collected in different dates.
Comparative material used in this study (selected samples):
Diaphorocellus sp. (nr. albooculatus): NAMIBIA: 1♂ 45 km N Okahandja, Prelude farm (32°17'S, 19°10'E), 16–25.x.1987, R. Jocqué (
Diaphorocellus helveolus: BOTSWANA: 1♂, Okavango Delta, Pom Pom, 23.viii.2001, M. Dangerfield, pitfall traps, dry riparian (NCA 2001/417); 1♀ same, near Shakawe (18°21'S, 21°50'E), 29.xi.2006, C. Haddad (NCA 2007/978).
Diaphorocellus rufus: TANZANIA: 1♂ 1♀ Mkomazi Game Reserve, 27.xi.1994, A. Russell-Smith (
Photographs were taken using a Zeiss Discovery V20 stereomicroscope with a Canon PowerShot G9 camera and an Olympus SZX16 stereomicroscope with an Olympus E-520 camera and prepared using CombineZP software. Scanning electron micrographs were made using the SEM JEOL JSM-5200 scanning microscope at the Zoological Museum, University of Turku, Finland. Illustrations of scuta and endogynes were made after maceration in a 20% potassium hydroxide aqueous solution and exposure for a few minutes in an alcohol/water solution of Chlorazol Black. Endogynes were photographed on slides either with an Olympus SZX16 or an Olympus BH-2. Small pieces of cotton were used to fix the copulatory organs in the correct position. Measurements were made to an accuracy of 0.01 mm. Lengths of leg and palp segments were measured on the dorsal side, from the midpoint of the anterior margin to the midpoint of the posterior margin. All measurements are given in millimetres.
The following abbreviations are used:
ALE anterior lateral eyes
AME anterior median eyes
Ce base of cymbium encircling bulb
Cg cilia of grape-shaped gland
CL carapace length
Cs strong cymbial setae
CW carapace width
Da dark area in basal part of receptacle
Em “embolus”
Ft fine threads
Gg grape-shaped gland
Ls lateral sclerite
Mo membranous outgrowth
Ms median sclerite
PLE posterior lateral eyes
PME posterior median eyes
Re receptacle
Rs membranous sac-shaped part of receptacle
So sclerotized outgrowth
Sb complex sclerotised base of receptacle
TL total length of body in dorsal view
Diaphorocellus
: Simon 1893: 314;
Diaphorocellus biplagiatus Simon, 1893, by monotypy.
Since its description, the genus has always been considered a member of the Old World subfamily Chediminae Simon, 1893. Diaphorocellus can be easily recognised by the large PME that are very close or even touching each other (as in Fig.
Diaphorocellus biplagiatus. 8 eye pattern in female, dorsal 9 epigastric scutum, female, ventral 10 epigastric scutum after maceration, caudal view 11–13 male palp, prolateral, ventro-prolateral and retrolateral. Abbreviations: Bs sclerite opposite to book lungs; Cs strong cymbial setae; Em “embolus”; Gg grape-shaped gland; Ls lateral sclerite; Mo membranous outgrowth; Ms median sclerite; Re receptacle; So sclerotised outgrowth.
Details of male palp of Diaphorocellus biplagiatus. 14, 17–18 cymbium and bulb, prolateral, ventro-prolateral (from above) and retrolateral 15 bulb, prolateral 16 femur and tibia, ventral 19 trochanter, femur and patella, retrolateral. Abbreviations: Ce base of cymbium encircling bulb; Cs strong cymbial setae; Em “embolus”; Mo membranous outgrowth; So sclerotised outgrowth.
Diaphorocellus
biplagiatus
Iheringia
biplagiata
:
The species can be distinguished from D. albooculatus by eye arrangement: in D. biplagiatus, the distance between the AMEs is two times less than their diameter, whereas in D. albooculatus, the distance is subequal; the shape of the ventral scuta of the males also differs (cf. Fig.
Male (NCA 2008/4672).
Habitus: as in Figs
Leg measurements: male NCA 2008/4672 (female NCA 2008/2607 in parentheses):
Femur | Patella | Tibia | Metatarsus | Tarsus | Total | |
---|---|---|---|---|---|---|
Palp | 0.50 (0.69) | 0.14 (0.18) | 0.27 (0.41) | – | 0.29 (0.42) | 1.20 (1.57) |
I | 1.49 (1.52) | 1.07 (1.28) | 0.99 (1.13) | 0.37 (0.44) | 0.51 (0.51) | 4.43 (4.88) |
II | 1.03 (1.20) | 0.61 (0.74) | 0.76 (0.85) | 0.53 (0.71) | 0.42 (0.45) | 3.35 (3.95) |
III | 0.86 (0.97) | 0.49 (0.70) | 0.60 (0.74) | 0.56 (0.79) | 0.43 (0.46) | 2.94 (3.66) |
IV | 1.35 (1.34) | 0.77 (0.85) | 1.03 (1.26) | 0.91 (1.13) | 0.54 (0.57) | 4.60 (5.15) |
Female (NCA 2008/2607).
Habitus: as in Figs
Details of endogyne of Diaphorocellus biplagiatus. 20 dorsal 21 basal part, caudal-dorsal 22 grape-shaped glands 23 base of receptacles, dorsal 24 tip of base showing cilia 25 lateral part of receptacle base showing grape-shaped glands and fine threads 26 terminal part of receptacle base 21–26 made by transmitting microscope. Abbreviations: Cg cilia of Gg; Da dark area of Sb; Ft fine threads; Gg grape-shaped gland; Rs membranous sac like part of Re; Sb complex sclerotised base of Re.
♀ (probably immature) – SOUTH AFRICA: Western Cape: “Caput Bonæ-Spei” (Cape of Good Hope), with no other data provided.
(selected samples). SOUTH AFRICA: Western Cape: 1♂ Beaufort-West, Farm Katdoornkuil (32.7093°S, 22.7538°E), 3-6.xii.2007, D.H. Jacobs, pitfall traps, Karoo bush (NCA 2008/4672); 1♀ same, Farm Kantkraal (32.7605°S, 22.7673°E), 3-6.xii.2007, D.H. Jacobs (NCA 2008/2607); 1♂ same, Farm Vaalkuil (32.8139°S, 22.7818°E), 3-6.xii.2007, D.H. Jacobs (NCA 2008/2673); 1♂ same, Farm Bokvlei (32.4331°S, 23.3535°E), 11-14.xii.2007, D.H. Jacobs (NCA 2008/4676); 1♂ 1♀ same, Farm Eerste Water (32.6887°S, 22.9610°E), 6-9.xii.2007, D.H. Jacobs (NCA 2008/4675); 1♂ Cederberg Wilderness Area, Wupperthal (32°16.757'S, 19°13.200'E), 515 m, 6.x.2009, S. Kritszinger-Klopper (NCA 2011/2739); 1♀ same, Sneeukop, (32°21.141'S, 19°10.073'E), 1680 m, 1-31x.2004, E. Nortje, S. Kritszinger-Klopper (NCA 2011/1129); 1♂ Cederberg, Sederhoutkloof (32°17'S, 19°10'E), 1100–1200 m, 2.vii.1994, R. Jocqué & M. Jocqué (
Most specimens were collected in karoo bush with pitfall traps.
We thank Ansie Dippenaar-Schoeman and Petro Marais (NCA) and Rudy Jocqué (