Ischnothyreus barratus, 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 : 94-98

Ischnothyreus barratus , new species Figures 56–57 , map 9

TYPES: AUSTRALIA: Queensland: Male holotype from Mount Elliot National Park, Upper North Creek, 19.48334 ° S, 146.9667 ° E, 1000 m (3–5 Dec 1986, G. Monteith, G. Thompson, D. Hamlet), deposited in QM ( S18696 , PBI_OON 00021981). Female allo- type from Mount Elliot National Park, summit, 19.48334 ° E, 146.9667 ° E, 1150 m (1 Jan 1900, A. Graham), deposited in QM ( S37946 , PBI_OON 00021734).

ETYMOLOGY: The specific epithet is derived from the Latin barrus and - atus, meaning ‘‘elephant, pertaining to’’ ( Brown, 1956), and refers to the trunklike embolic part of the male palp.

DIAGNOSIS: Male fang with slight basal process that is dorsally flattened, embolic part of palp without enlarged or complex distal tip, but shaped like an elephants trunk, with rounded tip (fig. 57A, B). Females have a simple epigynal region with a thick convoluted duct, and a very small, rounded epigynal atrium (figs. 56I, 57F). The posterior edge of the female dorsal scute is wider than the anterior edge (fig. 56D).

MALE (PBI_OON 21981, figs. 56A–C, G– H, 57A–E). Total length 1.43. CEPHALO- THORAX: Carapace pale orange, broadly oval in dorsal view, pars cephalica strongly elevated in lateral view, anteriorly narrowed to between 0.5 and 0.75 times its maximum width, 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 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 straight, anterior face unmodified; promargin with one larger denticle; shape normal, with dorsally flattened basal process; 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 1/2 to 3/4 of abdomen, more than 1/2 to most of abdomen width, middle surface smooth, sides smooth. Postepigastric scutum yellow, covering about 1/2 of abdominal length. Dorsum, epigastric area, and postepigastric area setae dark. LEGS: White, 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; patella about as long as femur; cymbium dark red-brown; bulb dark red-brown, more than two times as long as cymbium, stout; embolic region without enlarged or complex distal tip, shaped like elephant’s trunk, elongate, distal edge round- ed, subdistal transparent membranous structure on dorsal aspect (fig. 57A, B).

FEMALE (PBI_OON 21734, figs. 56D–F, I, 57F). Total length 1.58. CEPHALOTHO- RAX: Carapace pars cephalica slightly elevated in lateral view, anteriorly narrowed to 0.49 times its maximum width or less. ABDOMEN: Dorsal scutum between 1/4 and 1/2 abdomen width. Epigastric scutum small lateral sclerites present. Postepigastric scutum pale orange, widely hexagonal. LEGS: 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: Ventral view: epigynal atrium simple, small and rounded, sclerotization heavier around posterior edge; convoluted duct thicker than apodemes (figs. 56I, 57F).

OTHER MATERIAL EXAMINED: AUS- TRALIA: Queensland: Ella Bay National Park (NQ 10), rainforest, 17.48334 ° S, 146.07170 ° E, July 24–Nov. 25, 1992 (R. Raven, P. Lawless, E. Lawless, M. Shaw, QM S24917 , PBI _OON 21717), 1 ³ ; Hinchinbrook Island, Gayundah Creek , rainforest, 10 m, 18.35983 ° S, 146.21820 ° E, Nov. 8–17, 1984 (V. Davies, J. Gallon, QM S58702, PBI _OON 22212), 1 ³ ; Hinchinbrook Island, Bowen Creek , rainforest, leaf litter, 18.30000 ° S, 146.23333 ° E, July 11, 1977 (R.W. Taylor, ANIC, PBI _OON 25824), 1 ♀ ; Hinchinbrook Island, Missionary Bay , rainforest, leaf litter, 18.23333 ° S, 146.21666 ° E, July 10, 1977 (R.W. Taylor, ANIC, PBI _OON 25825), 1 ♀ ; Hinchinbrook Island, Missionary Bay , rainforest, leaf litter, 18.23333 ° S, 146.21666 ° E, July 10, 1977 (R.W. Taylor, ANIC, PBI _OON 25826), 2 ³, 2 ♀ ; Hinchinbrook Island, Missionary Bay , rainforest, leaf litter, 18.23333 ° S, 146.21666 ° E, July 10, 1977 (R.W. Taylor, ANIC, PBI _OON 25827), 2 ♀ ; Hinchinbrook Island, Missionary Bay , rainforest, leaf litter, 18.23333 ° S, 146.21666 ° E, July 10, 1977 (R.W. Taylor, ANIC, PBI _OON 25828), 2 ³ ; Mission Beach , 20 m, 17.52000 ° S, 146.05000 ° E, Jan. 29–Mar. 4, 1996 (M. Cermak, ANIC, PBI _ OON 5855 ), 1 ³ ; Mount Elliot National Park, Upper North Creek , rainforest, 1000 m, 19.48334 ° S, 146.96670 ° E, Dec. 3–5, 1986 (G. Monteith, G. Thompson, D. Hamlet, QM S18690 , PBI _OON 22158), 8 ♀ ; Palm Island , site 1, rainforest, leaf litter, 450 m, 18.73800 ° S, 146.58920 ° E, Feb. 20–21, 2001 (G. Monteith, QM S67575, PBI _OON 22249), 1 ♀ ; Polly Creek ( Hasenpusch property), rainforest, 50 m, 17.46667 ° S, 146.01670 ° E, Nov. 25, 1994, to Jan. 10, 1995 (G. Monteith, J. Hasenpusch, QM S27946 , PBI _OON 22229), 1 ³ .

DISTRIBUTION: This species is known from Ella Bay south of Cairns to Elliot Uplands, Hinchinbrook, and Palm Island, in northeastern Queensland (map 9).

Figures

Fig. 56. Ischnothyreus barratus, sp. nov. Holotype male (PBI_OON 00021981): A. habitus, dorsal view; B. habitus, ventral view; C. habitus, lateral view; G. carapace, anterior view; H. sternum, ventral view. Allotype female (PBI_OON 00021734): D. habitus, dorsal view; E. habitus, ventral view; F. habitus, lateral view; I. epigynum, ventral view.

Fig. 57. Ischnothyreus barratus, sp. nov. Holotype male (PBI_OON 00021981): 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 00021734): F. epigynum, ventral view. Scale lines 5 0.1 mm.