Ischnothyreus haymozi 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 : 56

Ischnothyreus haymozi Richard , sp. nov.

( Figs. 43–46 )

Type material. Holotype: male (PBI_OON00052390), SUMATRA: Kerinci, N. Park, 800m, nr. river, leaflitter, July 21–30, 1988, leg. Suh. Djojosudharmo, Coll. Deeleman, NNM Leiden.

Paratypes: 2 males (PBI_OON00031888), collected with holotype.

Additional material examined. 1 male (PBI_OON00031888), collected with holotype.

Etymology. The species epithet is dedicated to John-Clay Haymoz from Küsnacht, ZH, an arachnologist with special interest in African Theraphosidae , and good friend of the author.

Diagnosis. Males of I. haymozi sp. nov. strongly resemble males of I. namo Kranz-Baltensperger, 2012 in their palpal morphology but can be distinguished from them by the presence of a weakly sclerotized cheliceral process (p, Figs. 45 C, D, 46D, E), whose orientation can vary between specimens (compare Figs. 45 A and B) and the size of the dorsal abdominal scutum which is shorter in I. haymozi sp. nov. ( Fig. 43 G). Pedipalps of I. haymozi sp. nov. show an accentuated retrolateral lobe and a distal tongue-shaped membrane on the embolic tip (rl, tsm, Figs. 44 D– I), which resembles the spoon-shaped appendage of I. ligulatus and I. nentwigorum sp. nov. The pedipalps and chelicerae of I. haymozi sp. nov. look very similar to I. obscurus sp. nov. but these two species can be distinguished by the tip of the bulb which is shorter and less slender in I. haymozi sp. nov.. Further, the overall body sclerotization is darker in I. obscurus sp. nov..

Description. Male: (PBI_OON00052390). Total length 1.91; carapace length: 0.91; carapace width: 0.73; abdomen length; 0.92.

CEPHALOTHORAX: Carapace yellow-brown, 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; non-marginal pars thoracica setae dark, needle-like. 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, with radial furrows between coxae I–II, II–III, III–IV, furrow smooth, surface smooth, microsculpture absent, lateral margin without infra-coxal grooves, distance between coxae approximately equal, extensions of precoxal triangles present, lateral margins unmodified; setae dark, needle-like, evenly scattered, originating from surface. Mouthparts: Chelicerae, endites and labium pale orange. Chelicerae straight, anterior face unmodified; directed medially, shape normal, tip unmodified; setae dark, needle-like, evenly scattered. Fang base with less sclerotized process with variable orientation (p, Figs. 45 C, D, 46D, E). 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, fused to epigastric scutum, middle surface smooth, sides smooth. Epigastric scutum weakly sclerotized, surrounding pedicel, not protruding, small lateral sclerites present. Postepigastric scutum weakly sclerotized, pale orange, short, only around epigastric furrow, fused to epigastric scutum, anterior margin unmodified. Dorsum setae present, dark, needle-like. Spinneret scutum with fringe of needle-like setae.

LEGS: pale orange, without color pattern; patella plus tibia I longer than 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: furrow without setae. Bulb with one large edged ventral protuberance, retrolateral lobe accentuated (rl, Figs. 44 H, I, 46C). Tip of bulb slender, with prolateral groove and distal tongue-shaped membrane (pg, tsm, Figs. 44 D–I, 46B, C).

Female: Unknown.

Distribution. Known only from Kerinci National Park in middle Sumatra.

Figures

FIGURE 43. Ischnothyreus haymozi sp. nov. Male: A, H, left palp, prolateral view; B, left bulbus, prolateral view; C, left bulbus, retrolateral view; D, F, left embolus, prolateral view; E, G, left embolus, retrolateral view; I, left palp, retrolateral view. rl, retrolateral lobe; tsm, tongue-shaped membrane. Scale bars: A, B, H = 0.1 mm.

FIGURE 44. Ischnothyreus haymozi sp. nov. Male: A, H, left palp, prolateral view; B, left bulbus, prolateral view; C, left bulbus, retrolateral view; D, F, left embolus, prolateral view; E, G, left embolus, retrolateral view; I, left palp, retrolateral view. rl, retrolateral lobe; tsm, tongue-shaped membrane. Scale bars: A, B, H = 0.1 mm.

FIGURE 45. Ischnothyreus haymozi sp. nov. Male: A, chelicerae, posterior view; B, C, right chelicera, posterior view; D, right chelicera, anterior view. p, process; r, rostrum. Scale bars: B, C = 0.1 mm.

FIGURE 46. Ischnothyreus haymozi sp. nov. Male, SEM images: A, right palp, prolateral view; B, right embolus, prolateral view; C, right embolus prolateral view; D, left chelicera, anterior view; E, apophysis of left chelicera, anterior view; F, tip of right leg I, prolateral view. p, process; pg, prolateral groove; rl, retrolateral lobe; tsm, tongue-shaped membrane. Scale bars: A = 0.1 mm; B, C, F = 20 µm; D = 50 µm; E = 10 µm.