Ischnothyreus sigridae 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: 29-34

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Ischnothyreus sigridae Richard

sp. nov.

Ischnothyreus sigridae Richard  , sp. nov.

( Figs. 20–23View FIGURE 20View FIGURE 21View FIGURE 22View FIGURE 23)

Type material. Holotype: male (PBI_OON00052396), JAVA: W  . Java, Cibodas , 1500–1600m, December 1986, leg. Suh. Djojosudharmo, Coll. Deeleman, NNM Leiden. 

Etymology. The specific name is a patronym in honor of Dr. Sigrid van Rensen (July 17, 1940 – June 19, 2015), a psychologist and good friend of the author.

Diagnosis. Males of I. sigridae  sp. nov. resemble males of I. barratus Edward & Harvey, 2014  and I. monteithi Edward & Harvey, 2014  in palpal morphology but I. sigridae  sp. nov. can be distinguished by the shape of the more slender tip of the bulb with strong wrinkles on the dorsal side (w, Figs. 22View FIGURE 22 C –F). Furthermore the process on the fang base of I. sigridae  (p, Figs. 23View FIGURE 23 C, D) is diagnostic and lacking in I. barratus  and I. monteithi  . Description. Male: (PBI_OON00052396). Total length 1.45; carapace length: 0.73; carapace width: 0.60; abdomen length; 0.69.

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, with angular posterolateral corners, surface of elevated portion of pars cephalica finely reticulate, 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 characteristic process (p, Figs. 23View FIGURE 23 C, D). Labium elongated hexagon, 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 more than 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, pale orange, short, almost rectangular, covering about 1/3 of the abdominal length, not fused to epigastric scutum, anterior margin unmodified. Dorsum setae present, dark, needle-like. Spinneret scutum with fringe of needle-like setae. Interscutal membrane with setae.

LEGS: yellow, without color pattern; patella plus tibia I near as long as carapace, tibia I unmodified. Leg spination: femora: I p0-1-1; II p0-0-1; tibiae: I, II p2-2-0; r2-2-0; metatarsi: I, II p1-1-0; r1-1-0. GENITALIA: Epigastric region with sperm pore large, oval, situated at level of anterior spiracles, unmodified. Tip of bulb slender, bent dorsally, with dorsal wrinkles (w, Figs. 22View FIGURE 22 C –F). Bulb with one small ventral protuberance, retrolateral lobe pointed (rl, Fig. 22View FIGURE 22 H).

Female: Unknown.

Distribution. Known only from Cibodas in western Java.


National Museum of Natural History, Naturalis