Ischnothyreus piricius, 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 : 92-94

Ischnothyreus piricius , new species Figures 54–55 , map 9

TYPES: AUSTRALIA: Queensland: Male holotype, female allotype, and 3 male paratypes from Emmett Creek area S of Townsville (NQ 4/1), 19.45 ° S, 147.4 ° E (26 Oct 1991 – 27 Jul 1992, P. Lawless, R. Raven, M. Shaw), deposited in QM (³ holotype: QM S21948 , PBI _ OON 00022002 ; ♀ allotype and ³ paratypes: QM S95972 , PBI _ OON 00005623 ) .

ETYMOLOGY: The specific epithet is derived from the Latin pirum and - anus meaning ‘‘pertaining to the pear’’ ( Brown, 1956), and refers to the pear-shaped epigynal atrium of the female epigynum.

DIAGNOSIS: This species can be easily recognized by an orange-brown bulbous male palp, which has an elongate and distally tapered, obtusely bent embolic region (figs. 54H, 55A, B). Females exhibit an epigynal atrium that is distinctly pear shaped (figs. 54I, 55E).

MALE (PBI_OON 22002, figs. 54A–C, G– H, 55A–D). Total length 1.28. CEPHALO- THORAX: Carapace orange, broadly oval in dorsal view, pars cephalica slightly 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 finely reticulate. Clypeus margin unmodified, curved downward in front view, low, ALE separated from edge of carapace by less than their radius; setae light. Eyes: ALE largest, ALE circular, PME oval, PLE oval; posterior eye row procurved from above; ALE touching, ALE-PLE touching. Sternum longer than wide, pale orange, uniform. Chelicerae, endites, and labium pale orange. Chelicerae straight, anterior face unmodified; fang shape normal, without prominent basal process; setae light. 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, subdistal portion with unmodified setae. 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 orange-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: 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. GENI- TALIA: Palp proximal segments orangebrown; embolus dark; femur shorter than trochanter; patella about as long as femur; cymbium orange-brown; bulb orange-brown, 1 to 1.5 times as long as cymbium; palpal bulb bulbous; embolic region obtusely bent at right angles to palpal bulb, elongate, distally tapered (figs. 54H, 55A, B).

FEMALE (PBI_OON 5623, figs. 54D–F, I, 55E). Total length 1.51. CEPHALOTHO- RAX: Carapace nonmarginal pars cephalica setae dark. Clypeus setae dark. Eyes: PME circular; posterior eye row straight from above. 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: 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 distinctly pear shaped, without sclerotized projections; convoluted duct tightly coiled, stout, thicker than apodemes (figs. 54I, 55E).

OTHER MATERIAL EXAMINED: AUS- TRALIA: Queensland: Emmett Creek area S of Townsville (NQ 4/1), 19.45000 ° S, 147.40000 ° E, July 27–Dec. 2, 1992 (R. Raven, P. Lawless, E. Lawless, M. Shaw, QM S24753 , PBI _OON 21731), 1 ♀ ; Mount Cleveland summit, 560 m, 19.25433 ° S, 147.02430 ° E, Jan. 19, 1991 (A. Graham, QM S33471 , PBI _OON 22222), 1 ♀ ; Mount Cleveland , summit, 500 m, 19.26667 ° S, 147.05000 ° E, Mar. 23, 1991 (G. Monteith, QM S31881 , PBI _OON 22059), 1 ♀ .

DISTRIBUTION: This species is known only from Emmett Creek and Mount Cleveland, south of Townsville, in northeastern Queensland (map 9).

Figures

Fig. 54. Ischnothyreus piricius, sp. nov. Holotype male (PBI_OON 00022002): A. habitus, dorsal view; B. habitus, ventral view; C. habitus, lateral view; G. carapace, anterior view; H. sternum, ventral view. Allotype female (PBI_OON 00005623): D. habitus, dorsal view; E. habitus, ventral view; F. habitus, lateral view; I. epigynum, ventral view.

Fig. 55. Ischnothyreus piricius, sp. nov. Holotype male (PBI_OON 00022002): A. left palp, prolateral view; B. left palp, retrolateral view; C. left chelicerae, anterior view; D. left chelicerae, posterior view. Allotype female (PBI_OON 00005623): E. epigynum, ventral view. Scale lines 5 0.1 mm.