Ischnothyreus ujungkulon Richard

Richard, Miguel, Graber, Werner & Kropf, Christian, 2016, The goblin spider genus Ischnothyreus (Araneae, Oonopidae) in Java and Sumatra, Zootaxa 4151 (1), pp. 1-99 : 34

Ischnothyreus ujungkulon Richard , sp. nov.

( Figs. 24–26 )

Type material. Holotype: male (PBI_OON 00052391), JAVA: W . Java, Ujung Kulon National Park (6° 44′ 48″ S, 105° 20′ 1″ E), November 14–25, 1986, leg. Suh. Djojosudharmo, Coll. Deeleman, NNM Leiden.

Etymology. The specific epithet is a noun in apposition, taken from the type locality, Ujung Kulon National Park in Western Java, which is one of the last big reserves of primary lowland forest in Java.

Diagnosis. Males of I. ujungkulon sp. nov. resemble males of I. barratus Edward & Harvey, 2014 and I. monteithi Edward & Harvey, 2014 in palpal morphology but I. ujungkulon sp. nov. can be distinguished by the shape of the tip of the bulb with its less sclerotized helix-shaped membrane (hm, Figs. 25 C–F) making it appear like a korkscrew. Also the slightly sclerotized crown-shaped process on the fang base of I. ujungkulon sp. nov. (p, Figs. 26 C, D) is diagnostic and lacking in I. barratus and I. monteithi .

Description. Male: (PBI_OON00052391). Total length 1.43; carapace length: 0.68; carapace width: 0.55; abdomen length; 0.63.

CEPHALOTHORAX: Carapace pale orange, broadly oval in dorsal view, pars cephalica strongly elevated in lateral view, anteriorly narrowed to 0.49 times its maximum width or less, surface of elevated portion of pars cephalica smooth, sides finely reticulate; lateral margin straight, smooth. Clypeus margin unmodified, straight in front view, sloping forward in lateral view, high, ALE separated from edge of carapace by their radius or more. Eyes six, well developed, ALE largest, ALE oval, PME squared, PLE oval; posterior eye row straight from above, procurved from front; ALE touching, ALE-PLE touching, PME touching throughout most of their length, PLE- PME touching. Sternum as long as wide, yellow, uniform, surface smooth, microsculpture absent, lateral margin without infra-coxal grooves, distance between coxae approximately equal, extensions of pre-coxal triangles absent, lateral margins unmodified; setae, dark, needle-like, evenly scattered, originating from surface. Mouthparts: Chelicerae, endites and labium yellow. Chelicerae straight, anterior face unmodified, directed medially, shape normal, tip unmodified; setae dark, needle-like, evenly scattered. Fang base with weakly sclerotized crown-shaped process (p, Figs. 26 C, D). Labium rectangular, not fused to sternum, anterior margin not indented at middle, same as sternum in sclerotization; with setae. Endites distally not excavated, anteromedian tip with one strong, tooth-like projection, much more heavily sclerotized than sternum.

ABDOMEN: ovoid, pointed posteriorly; dorsum soft portions white, without color pattern. Posterior spiracles not connected by groove. Scutum extending far dorsal of pedicel. Dorsal scutum weakly sclerotized, pale orange, without color pattern, covering 1/2 to 3/4 of abdomen, more than 1/2 to most of abdomen width, not fused to epigastric scutum, middle surface smooth, sides smooth. Epigastric scutum weakly sclerotized, surrounding pedicel, not protruding, small lateral sclerites absent. Postepigastric scutum weakly sclerotized, yellow, short, almost rectangular, covering about 1/3 of the abdominal length, not fused to epigastric scutum, anterior margin unmodified. Spinneret scutum present, incomplete ring. Dorsum setae present, dark, needle-like. Spinneret scutum with fringe of needle-like setae. Interscutal membrane without setae.

LEGS: yellow, without color pattern; patella plus tibia I shorter than carapace, tibia I unmodified. Leg spination: femora: I p0-1-1; II p0-0-1; patellae: II p1-1-0; r1-1-0; tibiae: I, II p2-2-0; r2-2-0; metatarsi: I p1-1-0; r1- 1-0. GENITALIA: Epigastric region with sperm pore large, oval, situated at level of anterior spiracles, unmodified. Bulb with one small ventral protuberance, retrolateral lobe hook-like (rl, Fig. 23 H). Tip of bulb with helix-shaped membrane (hm, Figs. 25 C–F).

Female: Unknown.

Distribution. Known only from Ujung Kulon National Park in western Java.

Figures

FIGURE 23. Ischnothyreus sigridae sp. nov. Male: A, C, left chelicera, anterior view; B, D, left chelicera, posterior view. p, process. Scale bars: A, C = 0.1 mm.

FIGURE 24. Ischnothyreus ujungkulon sp. nov. Male: A, habitus, dorsal view; B, habitus, ventral view; C, carapace, frontal view; D, habitus, lateral view; E, opisthosoma, dorsal view; F, sternum, ventral view; G, opisthosoma, lateral view; H, opisthosoma, ventral view. Scale bar: A = 1 mm.

FIGURE 25. Ischnothyreus ujungkulon sp. nov. Male: A, G, left palp, prolateral view; B, H, left palp, retrolateral view; C, left bulbus, prolateral view; D, F, left embolus, retrolateral view; E, left embolus, prolateral view. hm, helical membrane; rl, retrolateral lobe. Scale bars: A, G = 0.1 mm.

FIGURE 26. Ischnothyreus ujungkulon sp. nov. Male: A, right chelicerae, posterior view; B, D, right chelicera, anterior view; C, right chelicera, posterior view. p, process. Scale bars: B, D = 0.1 mm.