Aposphragisma sumatra Fardiansah & Duperre , sp. n.

Fardiansah, Riko, Duperre, Nadine, Widyastuti, Rahayu, Potapov, Anton, Stefan Scheu, & Harms, Danilo, 2018, Description of three new species of Aposphragisma Thoma, 2014 (Araneae: Oonopidae) from Sumatra, Indonesia, ZooKeys 797, pp. 71-85 : 81-84

Aposphragisma sumatra Fardiansah & Duperre, sp. n. Figs 7, 8, 9

Type material.

Holotype ♂: Indonesia, Sumatra, Harapan, 02°09'09.9"S 103°21'43.2"E, secondary lowland rainforest, 10 June 2017, B. Klarner (LIPI). Paratypes: 2♀, Indonesia, Sumatra, Harapan, 02°09'09.9"S 103°21'43.2"E, secondary lowland rainforest, 4 September 2017 (LIPI) ( ZMH–A 0001198, ZMH–A 0001203); 02°09'09.9"S 103°21'43.2"E, 1♂3♀, 8 March 2017, B. Klarner ( ZMH–A 0001196, ZMH -A0001197, ZMH–A 0001199, ZMH–A 0001202), 3♂4♀, 10 June 2017, B. Klarner ( ZMH–A 0001195, ZMH–A 0001200, ZMH–A 0001204), 1♂, 26 November 2017, B. Klarner ( ZMH–A 0001194).

Etymology.

The specific name is a noun in apposition, the name of the island on which the types were collected.

Diagnosis.

Aposphragisma sumatra sp. n. males and females can be distinguished from most of the other Aposphragisma species by their completely reticulate sternum (Fig. 7E, F); from A. confluens Thoma, 2014, A. draconigenum Thoma, 2014, A. nocturnum Thoma, 2014 and A. scimitar Thoma, 2014 by their blunt tubercles on the carapace margin (Fig. 7G, H); absent or reduced in the other species; from A. stannum Thoma, 2014 by their longer embolus (Fig. 9B), shorter in the latter species ( Thoma et al. 2014; fig. 48D). From A. rimba Thoma, 2014, both males and females are differentiated by their reticulated carapace (Fig. 7G, H) and reduced eyes; in A. rimba the carapace and the eyes are of normal size ( Thoma et al. 2014; fig. 38A).

Description.

Male (holotype). Total length: 1.28; carapace length: 0.58; carapace width: 0.41; abdomen length: 0.70; abdomen width: 0.42. Cephalothorax. Carapace: Brownish orange, broadly oval in dorsal view, slightly elevated in lateral view, surface of elevated portion of pars cephalica smooth and without spikes, with 2 small tubercles at apical end that bear a terminal seta (Fig. 7A, G); sides finely reticulated; pars thoracica finely reticulated, sloping gradually, lateral margin with blunt denticles (Fig. 7G). Sternum: Brownish orange; longer than wide, finely reticulated, surface covered with setae (Fig. 7E). Eyes: Six, reduced, all oval; ALE largest; posterior eye row straight from above; ALE separated by their diameter, ALE-PLE separated by less ALE radius, PME separated by less than its radius, PLE-PME separated by less than its radius (Fig. 7A). Mouthparts: chelicerae yellowish white, straight in frontal view, convex in lateral view (Fig. 7G); posterior margin of inner surface proximally modified to a ridge with a median slit (sli); promargin with a row of flattened setae, distally extending into a short inward-pointing tooth-like projection (tlp) (Fig. 7E). Labium triangular, deeply incised, fused to sternum (Fig. 7E). Endites elongated, outer margin subdistally with a pair of long inward bent setae. Abdomen. Dorsal scutum yellowish white, ovoid; strongly sclerotized and covering full length abdomen (Fig. 7A); epigastric scutum strongly sclerotized, anteriorly with widely oval subterminal scutal ridge (sr) (Fig. 8A), book lung covers large, ovoid, surface smooth (Fig. 8A). Postepigastric scutum long, strongly sclerotized, venter fully occupied, posteriorly directed lateral apodemes (lap) long (Figs 7B, 8B). Legs: yellowish white. Genitalia. Epigastric region: sperm pore situated at level of posterior spiracles (Fig. 8B). Palp: White, not strongly sclerotized (Fig. 9A); cymbium slightly rectangular in dorsal view; bulb stout; conical bulge slightly flat (Fig. 9A, B); embolus (e) basally narrowed, very long, twisted and with wavy tip; conductor (c) medially triangular and with wide tip (Fig. 9B).

Female (paratype). Total length: 1.46; carapace length: 0.61; carapace width: 0.43; abdomen length: 0.85; abdomen width: 0.48. Colouration: same as in male. Cephalothorax. Carapace: Same as in male. Mouthparts: chelicerae distally without pointed tooth-like projection (tlp). Abdomen: Dorsal scutum not covering full length of the abdomen, soft tissue visible in dorsal view (Fig. 7C); epigastric scutum not fused to postepigastric scutum; postepigastric scutum not fully covering the venter, and with short posteriorly directed lateral apodemes (lap) (Fig. 8D). Legs: yellowish white. Genitalia. Dorsal view (Fig. 9C): Receptaculum (re) small, slightly rectangular; median part with papillae; laterally framed by rectangular sclerites (apodemes, lap) with wide and slightly bumpy tip, apodemes sloping upward; rectangular appendix lying dorsally of receptaculum about as long as receptaculum; a transverse sclerite (tsc) lies anteriorly to the receptaculum and bears medially a nail-like structure (na).

Natural History.

Specimens were collected in a secondary degraded lowland rainforest only.

Distribution.

Known only from the type locality, Bukit Duabelas National Park, Sumatra.