Oedothorax bifoveatus, Tanasevitch, 2017

Tanasevitch, Andrei V., 2017, New genera and new species of the family Linyphiidae from Borneo, Sumatra and Java (Arachnida, Araneae), Revue suisse de Zoologie 124 (1), pp. 141-155 : 148-149

Oedothorax bifoveatus sp. nov.

Figs 31-34 , 46-51

Holotype: Male; Indonesia, Java, Cibodas Botanical Garden, near Cipanas, ca 50 km E of Bogor , 1400 m a.s.l., vegetational debris in montane Lithocarpus & Castanopsis forest, sifting; 3.-6.XI.1989; leg. D. Burckhardt, I. LöbI & D. Agosti [# 2a ].

Paratypes: 2 males, 17 females; collected together with the holotype. – 1 male, 21 females; Java, Gunung Gede - Pangrango National Park, near Cibodas, 6°47’0”S, 107°01’0”E, 1450-1600 m a.s.l.; 4.-11.V.2005; leg. A. Schulz [AS-05/11]. – 3 males, 1 female; East Malaysia, Borneo Island, Sabah, Tambunan District, Crocker Range, near pass, 1550-1650 m a.s.l., road Kota Kinabalu to Tambunan, Lithocarpus & Castanopsis forest, sifting dead wood, leaves and moss; 16.V.1987; leg. D. Burckhardt & I. Löbl [#27a].

Etymology: The species name is an adjective derived from the Latin “fovea”, meaning “a pit”, a “socket”, referring to the structure of the epigyne.

Diagnosis: The species is characterized by the unmodified carapace, by the peculiar shape of the palpal tibia, as well as by the curved shape of the convector in the male. The female is characterized by the specific structure of the epigyne, namely by the presence of two large sockets on either side of the median plate.

Description: Male (holotype). Total length 1.83. Carapace ( Fig. 31 ) unmodified, 0.95 long, 0.70 wide, greyish pale yellow-brown, with indistinct, grey, radial stripes and darker margin; sulci absent. Chelicerae 0.38 long, mastidion absent. Legs yellow. Leg I 3.43 long (0.90+0.25+0.88+0.80+0.60), IV 3.33 long (0.88+0.25+0.85+0.85+0.50). Chaetotaxy 2.2.1.1, length of spines about 1-1.5 diameters of segment. TmI 0.61. All metatarsi with trichobothrium. Palp ( Figs 46-50 ): Tibia with a narrow notch retrolaterally and a sharp tooth prolaterally. Paracymbium with a massive distal part, bearing several strong, long spines. Distal suprategular apophysis short and wide. Convector large, spindly curved, distal apophysis (DAC in Figs 46, 50 ) ending in several short, pointed processes. Abdomen 0.95 long, 0.70 wide, dorsally grey, with a pale, longitudinal stripe.

Female. Total length 2.23, habitus as shown in Fig. 32 . Carapace 0.88 long, 0.40 wide, unmodified. Chelicerae 0.40 long. Leg I 3.18 long (0.88+0.25+0.80+0.75+0.50), leg IV 3.16 long (0.88+0.25+0.80+0.75+0.48). TmI 0.62. Abdomen 1.28 long, 1.00 wide, dorsal and ventral pattern as shown in Figs 32 and 33 , respectively. Epigyne ( Figs 33-34 , 51 ) with two large rounded sockets on either side of median plate. Receptacles small, rounded. Body coloration, leg coloration and chaetotaxy as in male.

Taxonomic remarks: By the unmodified carapace and by the structure of the embolic division, namely the small embolus and the shape of the convector , the new species resembles several Oriental congeners, e.g., O. cunur Tanasevitch, 2015 or O. rusticus Tanasevitch, 2015 , but is clearly distinguished from those and other congeners by the structure of the epigyne, namely by the presence two large, rounded sockets on either side of the median plate.

Distribution: Known from Borneo Island, East Malaysia, and from Java Island, Indonesia.

Figures

Figs 22 - 34. Photographs of Kalimagone cuspidata sp. nov., male and female paratypes from Mt Kinabalu (22 - 26), of K. rotunda sp. nov., male holotype and female paratype (27 - 30), and of Oedothorax bifoveatus sp. nov., male and female paratypes from Cibodas Botanical Garden (31 - 34). (22 - 23, 27) Male habitus. (31) Male cephalothorax, lateral view. (24, 28, 32) Female habitus. (25, 29, 33) Female abdomen, ventral view. (26, 30, 34) Epigyne, ventral view.

Figs 46 - 51. Oedothorax bifoveatus sp. nov., male and female paratypes from Cibodas Botanical Garden. (46 - 47) Right palp, retrolateral and prolateral view, respectively. (48) Palpal tibia and paracymbium, retrolateral view. (49) Palpal tibia, dorsal view. (50) Embolic division. (51) Epigyne, ventral view.