Ischnothyreus rixi, 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 : 119-122

Ischnothyreus rixi , new species Figures 68–69 , map 12

TYPES: AUSTRALIA: Queensland: Male holotype, female allotype and one female paratype from Bunya Mountains , 26.88333 ° S, 151.6 ° E (7–10 Nov 2005, M. Rix), deposited in QM (³ holotype: QM S96002 , PBI _ OON 00005888 ; ♀ allotype and paratype: QM S96003 , PBI _ OON 00005597 ) .

ETYMOLOGY: The specific epithet is a patronym in honor of Michael Rix of the Western Australian Museum (Perth), the collector of the holotype and other wonderful tiny spiders, in recognition of his contribution to taxonomy and systemtaics.

DIAGNOSIS: Males of this species are similar to I. tragicus , sp. nov., but can be distinguished by the stout palpal embolic region that tapers to a rounded tip (fig. 69A, B). The female epigynum has a triangular process overhanging circular epigynal atrium and the horizontal sclerotization anterior to epigynal atrium is very thick and strong (figs. 68I, 69F).

MALE (PBI_OON 5888, figs. 68A–C, G– H, 69A–E). Total length 1.65. CEPHALO- THORAX: Carapace brown, 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 separated from edge of carapace by less than their radius; setae dark. Eyes: ALE largest, ALE circular, PME circular, PLE oval; posterior eye row straight from above; ALE touching, ALE- PLE touching. Sternum longer than wide, pale orange, uniform; setae dark, densest laterally. Chelicerae, endites, and labium labium and endites dark red brown, chelicerae pale. Chelicerae slightly divergent, anterior face unmodified; promargin with one to two larger denticles; fang shape normal, with prominent basal process; setae dark. Labium elongated hexagon, not fused to sternum, anterior margin indented at middle, much more heavily sclerotized than sternum; with six or more setae on anterior margin, subdistal portion with unmodified setae. Endites anteromedian tip with one strong, toothlike projection, much more heavily sclerotized than sternum. ABDOMEN: Ovoid; dorsum soft portions white. Book lung covers elliptical. Dorsal scutum brown, 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 present. Postepigastric scutum pale orange, covering about 2/3 of abdominal length. Dorsum, epigastric area, and postepigastric area setae dark. LEGS: Orange-brown, without color pattern; patella plus tibia I shorter than carapace. Leg spination: femora: I p0-1-1; 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 one to two times as long as trochanter; patella about as long as femur; cymbium dark red-brown; bulb dark redbrown, 1 to 1.5 times as long as cymbium, stout; embolic region obtusely bent, simple, without enlarged or complex processes, stout, tapered to rounded tip (fig. 16A, B).

FEMALE (PBI_OON 5597, figs. 68D–F, I, 69F). Total length 1.88. CEPHALOTHO- RAX: Carapace pars cephalica slightly elevated in lateral view. Clypeus straight in front view. Chelicerae, endites, and labium pale orange. ABDOMEN: Dorsal scutum covering 1/2 to 3/4 of abdomen, between 1/4 and 1/2 abdomen width. Postepigastric scutum widely hexagonal, only around epigastric furrow. LEGS: Pale orange. Leg spination: femora: I p0-1-1; II p0-1-0; tibiae: I, II p2-2- 0; v2-2-0; metatarsi: I, II p1-1-0; v1-1-0. GENITALIA: Ventral view: strong horizontal scleriotization anterior to rounded epigynal atrium, thick, clearly joins posteriorly directed lateral apodemes; heavily sclerotized process overhanging epigynal atrium with triangular edge; convoluted duct thicker than apodemes (figs. 68I, 69F).

OTHER MATERIAL EXAMINED: AUS- TRALIA: Queensland: Boombana National Park, Jollys Lookout , sieved litter, dry forest, 27.40000 ° S, 152.80000 ° E (June 30, 1991, D. Black, WAM T78964, PBI _ OON 00004322 ), 2 ♀ ; Bunya Mountains, Mowbullan , rainforest, leaf litter, 26.85000 ° S, 151.56666 ° E, Aug. 10, 1955 (T.E. Woodward, QM S78056 , PBI _OON 26300), 1 ♀ ; D’Aguilar National Park, Boombana Walk , rainforest, leaf litter, 27.40611 ° S, 152.79083 ° E, May 12, 2007 (K. Edward and K. Pitz, QM S96004 , PBI _OON 25730), 1 ³ ; D’Aguilar National Park, Mount Glorious Walk , rainforest, leaf litter, 27.32194 ° S, 152.76250 ° E, May 12, 2007 (K. Edward and K. Pitz, QM S96005 , PBI _OON 25734), 1 ♀ ; D’Aguilar National Park, Mount Glorious Walk , rainforest, leaf litter, 27.32194 ° S, 152.76250 ° E, May 12, 2007 (K. Edward and K. Pitz, QM S96006 , PBI _OON 25735), 1 ³ ; D’Aguilar Range National Park, Boombana , 24 km W of Brisbane, eucalypt woodland, leaf litter, 520 m, 27.40194 ° S, 152.79222 ° E, May 4–5, 2009 (H. Wood, CASENT 9035024), 1 ♀ ; D’Aguilar Range National Park, Boombana , 24 km W of Brisbane, eucalypt woodland, leaf litter, 520 m, 27.40194 ° S, 152.79222 ° E, May 4–5, 2009 (H. Wood, CASENT 9035025, PBI _ OON 5635 ), 1 ♀ ; Nob Creek, Byfield (BandR Healy Property ), 22.86667 ° S, 150.61670 ° E, Aug. 1, 1994, to Jan. 1, 1995 (D. Wallace, Healy, QM S57991 , PBI _OON 21957) 10 ³, 4 ♀ .

DISTRIBUTION: This species is widespread from Brisbane to north of Rockhampton, in northeastern Queensland (map 12).

Figures

Fig. 68. Ischnothyreus rixi, sp. nov. Holotype male (PBI_OON 00005888): A. habitus, dorsal view; B. habitus, ventral view; C. habitus, lateral view; G. carapace, anterior view; H. sternum, ventral view. Allotype female (PBI_OON 00005597): D. habitus, dorsal view; E. habitus, ventral view; F. habitus, lateral view; I. epigynum, ventral view.

Fig. 69. Ischnothyreus rixi, sp. nov. Holotype male (PBI_OON 00005888): 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 00005597): F. epigynum, ventral view. Scale lines 5 0.1 mm.