Ischnothyreus namo , Kranz-Baltensperger, Yvonne, 2012

Kranz-Baltensperger, Yvonne, 2012, Three new species of the oonopid spider genus Ischnothyreus (Araneae: Oonopidae) from Tioman Island (Malaysia), Zootaxa 3161, pp. 37-47: 43-46

publication ID

http://doi.org/ 10.5281/zenodo.214142

persistent identifier

http://treatment.plazi.org/id/03B42166-FFD4-FFD5-86B4-CAFEFDCCFE54

treatment provided by

Plazi

scientific name

Ischnothyreus namo
status

sp. nov.

Ischnothyreus namo  sp. nov.

( Figs 5 –6View FIGURE 5View FIGURE 6, 7View FIGURE 7. A)

Type material. Holotype: male (PBI_OON 00012688), MALAYSIA: Tioman  Island (= Pulau Tioman  ), Gunung Kajang, 900–1000m, 2 ° 46 ’0”N, 104 °09’ 4 ”E, 29.IV. 2005, leg. A. Schulz, MHNG. Paratypes: 1 female (PBI_OON 00032382), collected with holotype, MHNG. 1 female (PBI_OON 00015670), Tioman  Island, westside, 2 km SE of Kampung Genting, 100m, 2 ° 47 ’N, 104 ° 8 ’E, 27.VI. 2001, leg. A. Schulz & K. Vock, MHNG. 1 male (PBI_OON 00012604), Tioman  Island, Gunung Kajang, 500–600m, 2 ° 46 ’0”N, 104 °09’ 4 ”E, 25.IV. 2005, leg. A.Schulz, MHNG. 2 females (PBI_OON 00012646), same data as holotype, but 27.IV. 2005, MHNG. 1 female (PBI_OON 00032352), Tioman  Island, path from Kampung Paya to Gunung Kajang, 200–600m, 02° 46 ’ 84 ”N, 104 °07’ 63 ”E, 6.– 7.VI. 2007. leg. A. Schulz, MHNG. 1 female (PBI_OON 00032353), Tioman  Island, westside of Gunung Kajang, 2 km E of Kampung Genting, 400m, 2 ° 47 ’N, 104 ° 8 ’E, 2.VII. 2001, leg. A. Schulz & K. Vock, MHNG. 1 female (PBI_OON 00015672), same data as PBI_OON 0 0 0 32353, but 300–400m, 3.VII. 2001, MHNG.

Etymology. The specific name is an arbitrary combination of letters.

Diagnosis. The male of I. namo  can be distinguished from males of I. tioman  and I. tekek  by the lack of the cheliceral apophyses and the simple palp. I. namo  resembles I. aculeatus ( Simon 1893)  from Sumatra and the Philippines but can be distinguished from this species by the abdominal scuta, which cover almost the whole abdomen ( Fig. 5View FIGURE 5 A –F), while they are short in I. aculeatus  . The female of I. namo  shows a very distinct epigastric conformation with strongly sclerotized apodemes and a strongly winding tube ( Fig. 6View FIGURE 6 C –E).

Description. Male. Total length 1.49 mm. Carapace: slightly elevated in lateral view, fovea present, lateral margin rebordered. Eyes: ALE separated by less than their radius. Mouthparts: Chelicerae slightly divergent, base of fang slightly enlarged, ridges (r) and three trichobothria-like setae present on the anterior face of the paturon (arrows) ( Fig. 5View FIGURE 5 D). Anterior margin of labium indented at middle. Anteromedian tip of endites with one strong, tooth-like projection (stp) ( Fig. 5View FIGURE 5 B). Abdomen: Scutum extending far dorsal of pedicel. Dorsal scutum covering more than 3 / 4 of abdomen, more than 1 / 2 to most of abdomen width, not fused to epigastric scutum. Legs: spine formula: femora: I p 0-1 - 1; II p0- 0-1; tibiae: I, II p 2 - 1 - 1; r 2 - 1 - 1; metatarsi: I, II p 1 - 1 -0; r 1 - 1 -0. Trichobothria not examined. Genitalia: Trochanter with small ventral projection (vp) ( Fig. 5View FIGURE 5 B); tibia with three trichobothria, distal part of bulb simple, with small prolateral membrane (mo) and retrolateral lobe (l), embolus (e) thin and short, directed backwards ( Fig. 5View FIGURE 5 E –F).

Female: Total length 1.39 mm. As in male except as noted. Carapace: without any pattern, broadly oval in dorsal view, pars cephalica strongly elevated in lateral view, fovea absent. Eyes: ALE separated from edge of carapace by less than their radius. ALE touching. Mouthparts: Labium not fused to sternum, anterior margin not indented at middle. Anteromedian tip of endites unmodified. Palpal femur with four spines, palpal tibia with three trichobothria. Abdomen: Pedicel scutum not extending far dorsal of pedicel. Dorsal scutum covering less than 1 / 2 of abdomen, between 1 / 4 and 1 / 2 abdomen width. Epigastric scutum slightly protruding. Postepigastric scutum widely hexagonal, only around epigastric furrow, not fused to epigastric scutum, with short posteriorly directed lateral apodemes. Dense patch of setae anterior to spinnerets present. Legs: spine formula: femora: I p 0-1 - 1; r 0-1 -0; II p0- 0-1; r0- 0-1; tibiae: I, II p 2 - 1 - 1; r 2 - 1 - 1; metatarsi: I, II p 1 - 1 -0; r 1 - 1 -0. Genitalia: The posterior margin of the epigastric scutum is lined with numerous needle-like setae. Postepigastric scutum with strongly sclerotized apodemes (a), connected by transverse ridge (tr). Dark, winding tube running posteriorly (wt) ( Fig. 6View FIGURE 6 D –F).

Distribution. Tioman  Island.

MHNG

Museum d'Histoire Naturelle