Ischnothyreus tectorius Tong & Li

Tong, Yanfeng, Koh, Joseph K. H., Tong, Xiujiao & Li, Shuqiang, 2016, Five new species of the genus Ischnothyreus Simon, 1893 from Singapore, ZooKeys 618, pp. 39-66 : 47-50

Taxon classification Animalia Araneae Oonopidae

Ischnothyreus tectorius Tong & Li sp. n. Figs 13, 14, 15

Type material.

Holotype: male (LKCNHM), Singapore: Central Catchment Nature Reserve, near Mandai Agrotechnology Park, Alt. 46 m, 1°24'53.7"N, 103°47'56.2"E, Sep 1, 2015, S. Li and Y. Tong leg. Paratypes: 7 males, 7 females (LKCNHM), same data as holotype.

Other material studied.

2 males, 1 female (SYNU-73), Singapore: Bukit Timah Nature Reserve, Alt. 86 m, 1°21'37.4"N, 103°46'30.0"E, August 24, 2015, S. Li and Y. Tong leg.; 7 males, 10 females (SYNU-74), Singapore: Central Catchment Nature Reserve, near Singapore Zoo, Alt. 50 m, 1°24'22.3"N, 103°47'7.4"E, August 30, 2015, S. Li and Y. Tong leg.; 12 females (SYNU-75), Singapore: Bukit Timah Nature Reserve, Seraya Loop, Alt. 118 m, 1°21'25.4"N, 103°46'25.3"E, August 17, 2015, S. Li and Y. Tong leg.; 6 males, 9 females (SYNU-76), Singapore: Central Catchment Nature Reserve (off Mandai Lake Road), Alt. 39 m, 1°24'30.7"N, 103°46'51.3"E, August 31, 2015, S. Li and Y. Tong leg.; 2 males, 5 females (SYNU-77), Singapore: Bukit Timah Nature Reserve, Catchment Path, Alt. 107 m, 1°21'12.5"N, 103°46'50.6"E, August 20, 2015, S. Li and Y. Tong leg.; 6 males, 11 females (SYNU-78), Singapore: Central Catchment Nature Reserve, near Singapore Zoo, Alt. 50 m, 1°24'22.3"N, 103°47'7.4"E, August 30, 2015, S. Li and Y. Tong leg.; 4 males, 3 females (SYNU-79), Singapore: Bukit Timah Nature Reserve, Jungle Fall Stream, Alt. 118 m, 1°21'25.4"N, 103°46'25.3"E, August 18, 2015, S. Li and Y. Tong leg.; 3 males, 3 females (SYNU-80), Singapore: Bukit Timah Nature Reserve, Jungle Fall Stream, Alt. 118 m, 1°21'25.4"N, 103°46'25.3"E, August 18, 2015, S. Li and Y. Tong leg.; 2 males, 2 females (SYNU-81), Singapore: Bukit Timah Nature Reserve, Jungle Fall Stream, Alt. 118 m, 1°21'25.4"N, 103°46'25.3"E, August 18, 2015, S. Li and Y. Tong leg.; 2 males, 2 females (SYNU-82), Singapore: Bukit Timah Nature Reserve, Bukit Timah Summit, Alt. 163 m, 1°21'16.65"N, 103°46'34.95"E, August 19, 2015, S. Li and Y. Tong leg.; 1 female (SYNU-83), Singapore: Bukit Timah Nature Reserve, Catchment Path, Alt. 107 m, 1°21'12.5"N, 103°46'50.6"E, August 20, 2015, S. Li and Y. Tong leg.; 2 females (SYNU-84), Singapore: Central Catchment Nature Reserve (off Mandai Lake Road), Alt. 39 m, 1°24'30.7"N, 103°46'51.3"E, August 31, 2015, S. Li and Y. Tong leg.; 2 males, 1 female (SYNU-90), Singapore: Pulau Ubin, Alt. 2 m, 1°25'18.0"N, 103°56'25.4"E, August 22, 2015, S. Li and Y. Tong leg.

Etymology.

The specific epithet means "usable to cover a roof" in Latin, and refers to the long protruding extension on male clypeus; adjective.

Diagnosis.

The new species can be distinguished from the congeneric species by the strongly protruding extension (spe) on male clypeus (Fig. 13I), the modifications on male chelicerae (Figs 13G, H, 15F) and the large, plate like sclerite (pls) in the female epigastric region (Fig. 14J, K).

Description.

Male (holotype). Total length 1.26; carapace 0.73 length, 0.57 width; abdomen 0.65 length, 0.35 width. Habitus as in Fig. 13A, C, E. Carapace: pale orange, with brown egg-shaped patches behind eyes, ovoid in dorsal view, strongly elevated in lateral view, surface of elevated portion of pars cephalica smooth, sides strongly reticulate, fovea absent, lateral margin straight, smooth (Fig. 13B, D). Clypeus: anterior margin with strongly protruding extension (spe) (Fig. 13I). Carapace anterolateral corners with strongly sclerotized, triangular extension (ste) (Fig. 13D). Eyes: six, well developed, ALE largest, ALE circular, PME and PLE oval, posterior eye row procurved from both above and front, ALE separated by less than their radius, ALE-PLE separated by less than ALE radius, PME touching, PLE-PME touching. Sternum: longer than wide, pale orange, uniform, not fused to carapace, surface smooth, setae sparse. Mouthparts: chelicerae, endites and labium orange. Chelicerae straight, base of fang unmodified, strongly sclerotized at lateral margin of paturon, proximal part of paturon with a scape-like sclerite (sls) (Fig. 15F), fang groove with a small denticle. Labium rectangular, fused to sternum, anterior margin not indented at middle. Antero median tip of endites with one strong, tooth-like projection (Fig. 13E, F). Abdomen: ovoid, rounded posteriorly. Posterior spiracles connected by groove. Pedicel tube short, ribbed, scutum not extending far dorsal of pedicel. Dorsal scutum well sclerotized, pale orange, covering approximately 4/5 of abdomen length, 2/3 of abdomen width, fused to epigastric scutum, middle surface and sides smooth. Epigastric and postepigastric scutum well sclerotized, pale orange, fused, without posteriorly directed lateral apodemes. Dorsum setae present, light, needle-like. Legs: pale orange, femur I with two prolateral and two small retrolateral spines, tibia I with four pairs, metatarsus I with two pairs of long ventral spines. Leg II spination is similar to leg I except femur with only one prolateral and one retrolateral spine. Legs III and IV spineless. Genitalia: epigastric region with sperm pore large, circular, situated at level of anterior spiracles, anterior margin of sperm pore with a fringe of needle-like setae. Palp strongly sclerotized, right and left palps symmetrical, proximal segments brown, trochanter with ventral projection (vp) (Fig. 15C), cymbium brown, fused with bulb, bulb brown, more than two times as long as cymbium, tapering apically, with two small ventral protuberance (vpr) (Fig. 15E), distal part elongated, end stout (Fig. 15A, C, D, E).

Female (paratype). Total length 1.24; carapace 0.72 length, 0.44 width; abdomen 0.77 length, 0.56 width. Habitus as in Fig. 14A, C, E. As in male except as noted. Carapace: without any pattern, broadly oval in dorsal view. Clypeus: margin unmodified, ALE separated from edge of carapace by less than their radius. Mouthparts: chelicerae and endites unmodified. Abdomen: dorsal scutum covering less than 1/2 of abdomen length, less than 1/3 of abdomen width. Postepigastric scutum rectangular, strongly sclerotized. Genitalia: the posterior margin of the epigastric scutum is lined with numerous needle-like setae. The epigastric groove is narrow. From the middle of the strongly thickened margin of the postepigastric scutum runs a dark, winding tube posteriorly (wt), ending in a triangular-shaped atrium (tsa) (Fig. 14J); from dorsal view, a large, plate like sclerite (pls) covers the internal structures (Fig. 14K).

Distribution.

Singapore.