Ischnothyreus ovinus, Edward & Harvey, 2014

Edward, Karen L. & Harvey, Mark S., 2014, Australian Goblin Spiders Of The Genus Ischnothyreus (Araneae, Oonopidae), Bulletin of the American Museum of Natural History 2014 (389), pp. 1-144 : 81-84

Ischnothyreus ovinus , new species Figures 47–48 , map 7

TYPES: AUSTRALIA: Queensland: Male holotype from Mount Edith, Lamb Range, 17.1 ° S, 145.6167 ° E, 1140 m (11 Oct 1982, G. Monteith, D. Yeates, G. Thompson), deposited in QM ( S16118 , PBI_OON 00025969). Female allotype and 1 female paratype from Emerald Creek, Lamb range, 17.1 ° S, 145.61666 ° E, 950 m (11 Oct 1982, G. Monteith, D. Yeates, G. Thompson), deposited in QM ( S16083 , PBI_OON 00025970).

ETYMOLOGY: The specific epithet is of the Latin ovinus , meaning ‘‘of sheep’’ ( Brown, 1956), and relates to the distribution of the species within the Lamb Range.

DIAGNOSIS: The male of this species can be distinguished by the distal tip of the embolic region of the palp, which is angled backward toward the cymbium and elongate, extending almost half way along the bulb (fig. 48A, B). The female epigynal region is quite similar to that of I. comicus , sp. nov., but differs in the discontinuous sclerotization of the epigynal atrium, which is much heavier around the lateral edges and not present around the anterior edge (fig. 48F).

MALE (PBI_OON 25969, figs. 47A–C, G– H, 48A–E). Total length 1.50. CEPHALO- THORAX: 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, anterolateral corners without extension or projections, surface of elevated portion of pars cephalica finely reticulate, sides strongly reticulate. Clypeus margin unmodified, curved downward in front view, low, ALE separat- ed from edge of carapace by less than their radius; setae dark. Eyes: ALE largest, ALE circular, PME oval, PLE oval; posterior eye row straight from above; ALE touching, ALE-PLE touching. Sternum longer than wide, pale orange, uniform; setae dark, evenly scattered. Chelicerae, endites, and labium pale orange. Chelicerae slightly divergent, anterior face unmodified; promargin with one larger denticle; fang shape normal, with slight basal process (fig. 48D); setae dark. Labium elongated hexagon, not fused to sternum, anterior margin indented at middle, same as sternum in sclerotization; with six or more setae on anterior margin. Endites anteromedian tip with one strong, toothlike projection, same as sternum in sclerotization. ABDOMEN: Ovoid; dorsum soft portions white. Book lung covers elliptical. Dorsal scutum pale orange, covering more than 3/4 of abdomen, more than 1/2 to most of abdomen width, middle surface smooth, sides smooth. Epigastric scutum small lateral sclerites absent. Postepigastric scutum pale orange, covering about 2/3 of abdominal length. Dorsum, epigastric area, and postepigastric area setae dark. LEGS: Pale orange, without color pattern; patella plus tibia I shorter than carapace. Leg spination: femora: I p0-2-0; II p0-1-0; tibiae: I, II p2-2-0; v2-2-0; metatarsi: I, II p1-1-0; v1-1-0. GENITALIA: Palp proximal segments dark red-brown; embolus dark; femur shorter than trochanter, without posteriorly rounded lateral dilation; patella shorter than femur; cymbium dark red-brown; bulb dark red-brown, more than two times as long as cymbium, stout; embolic region angled back toward cymbium, elongate, extending almost halfway along palpal bulb, rounded distal tip (fig. 48A, B).

FEMALE (PBI_OON 25970, figs. 47D–F, I, 48F). CEPHALOTHORAX: Carapace pars cephalica slightly elevated in lateral view. Clypeus straight in front view. ABDOMEN: Dorsal scutum covering about 1/2 of abdomen, between 1/4 and 1/2 abdomen width. Epigastric scutum small lateral sclerites present. Postepigastric scutum widely hexagonal, covering about 1/3 of the abdominal length. GENITALIA: Ventral view: epigynal atrium wider than high, smile shaped, lateral edges rounded, heavily sclerotized around lateral edges and not around anterior edge (fig. 48F), lacking heavily sclerotized processes over epigynal atrium; convoluted duct much thicker than apodemes.

OTHER MATERIAL EXAMINED: AUS- TRALIA: Queensland: Emerald Creek, Lamb Range , rainforest, leaf litter, 950 m, 17.10000 ° S, 145.61666 ° E, Oct. 11, 1982 (G. Monteith, D. Yeates, G. Thompson, QM S16027 , PBI _OON 25782), 1 ♀ ; Baldy Mountain Road, 2 km from S end, open forest, leaf litter, 1200 m, 17.33333 ° S, 145.41670 ° E, Nov. 30, 1997, to Feb. 5, 1998 (G. Monteith, D. Cook, QM S44749 , PBI _OON 22054), 1 ³ ; Lambs Head , 10 km W Edmonton, rainforest, 1200 m, 17.03333 ° S, 145.65000 ° E, Dec. 10, 1989, to Jan. 8, 1990 (G. Monteith, G. Thompson, H. Janetzki, QM S79684, PBI _OON 21783), 1 ³ ; Millstream CP, open forest, 1040 m, 17.53717 ° S, 145.48680 ° E, Dec. 6, 1998, to Feb. 4, 1999 (G. Monteith, D. Cook, QM S57151 , PBI _OON 22168), 1 ³ ; Mount Edith Road, Lamb Range , rainforest, 1000 m, 17.10000 ° S, 145.61670 ° E, Oct. 12, 1982 (G. Monteith, D. Yeates, G. Thompson, QM S16033 , PBI _OON 25780), 1 ♀ ; Mount Edith Road, Lamb Range , rainforest, leaf litter, 1000 m, 17.10000 ° S, 145.61670 ° E, Oct. 12, 1982 (G. Monteith, D. Yeates, G. Thompson, QM S16060 , PBI _OON 25783), 1 ³ ; Mount Edith Road, Lamb Range , rainforest, leaf litter, 780 m, 17.10000 ° S, 145.61670 ° E, Oct. 12, 1982 (G. Monteith, D. Yeates, G. Thompson, QM S16061 , PBI _OON 25786), 2 ♀ ; Mount Edith, Lamb Range , rainforest, leaf litter, 1050 m, 17.10000 ° S, 145.61670 ° E, Oct. 12, 1982 (G. Monteith, D. Yeates, G. Thompson, QM S16078 , PBI _OON 25784), 2 ³, 1 ♀ ; Wooroonooran National Park, Josephine Falls section, start of Mount Bartle Frere trail, rainforest, leaf litter, 17.44055 ° S, 145.85833 ° E, Apr. 25, 2009 (K. Edward and P. Cullen, QM S95951 ), 4 ³, 2 ♀ ; Wooroonooran National Park, Josephine Falls section, start of Mount Bartle Frere trail, rainforest, leaf litter, 17.44055 ° S, 145.85833 ° E, Apr. 25, 2009 (K. Edward and P. Cullen, QM S95952 , PBI _ OON 5538 ), 1 ♀ .

DISTRIBUTION: This species is only known from three central subregions of the Wet Tropics Bioregion (AU, LU, and BK), in northeastern Queensland (map 7).

Figures

Fig. 47. Ischnothyreus ovinus, sp. nov. Holotype male (PBI_OON 00025969): A. habitus, dorsal view; B. habitus, ventral view; C. habitus, lateral view; G. carapace, anterior view; H. sternum, ventral view. Allotype female (PBI_OON 00025970): D. habitus, dorsal view; E. habitus, ventral view; F. habitus, lateral view; I. epigynum, ventral view.

Fig. 48. Ischnothyreus ovinus, sp. nov. Holotype male (PBI_OON 00025969): A. left palp, prolateral view; B. left palp, retrolateral view; C. left chelicerae, anterior view; D. left chelicerae, posterior view; E. left palp, dorsal view. Allotype female (PBI_OON 00025970): F. epigynum, ventral view. Scale lines 5 0.1 mm.