Ischnothyreus tragicus, 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 : 37-41

Ischnothyreus tragicus , new species Figures 15–16 , map 5

TYPES: AUSTRALIA: Queensland: Male holotype, female allotype, and 1 female paratype from 3.0 km W Cape Tribulation, Site 6, 16.08333 ° S, 145.4333 ° E, 500 m (23 Sep–7 Oct 1982, G. Monteith, D. Yeates, G. Thompson), deposited in QM (³ holotype: QM S16073 , PBI _ OON 00025961 ; ♀ allotype: QM S16048 , PBI _ OON 00025960 ; ♀ paratype QM S16073 , PBI _ OON 00025755 ) .

ETYMOLOGY: The specific epithet is derived from the Latin tragicus meaning ‘‘pertaining to tragedy’’ ( Brown, 1956), and relates to the type locality and distribution of this species.

DIAGNOSIS: This species is similar to I. rixi , sp. nov., I. pterodactyl , sp. nov., I. hamatus , sp. nov., I. raveni , sp. nov., and I. arcus , sp. nov., in that the males exhibit a very prominent basal process on the fang and females exhibit a strong horizontal scleriotization or apodeme, anterior to a rounded epigynal atrium, that clearly joins to the posteriorly directed lateral apodemes in the epigynal region. However, males of this species are distinguished by the basal process of the fang consisting of numerous lobes, the posterior lobe of which is disc shaped (fig. 16C, D). The embolic part of the male palp although obtusely bent, is stout, and not tapered distally (fig. 16A, B). Females of this species differ in the shape of the overhanging process of the epigynal atrium, which has a very slight indent or a rounded edge and possesses a thick convoluted duct (figs. 15I, 16F). This species is pale orange in color and the dorsal scute of the female is small, covering 1/4–1/2 of abdomen width and 1/4–1/2 of the abdomen length (fig. 15D).

MALE (PBI_OON 25961, figs. 15A–C, G– H, 16A–E). Total length 1.40. 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 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 orange-brown. Chelicerae slightly divergent, anterior face unmodified; promargin with two to three larger denticles; fang shape normal, with prominent basal process of numerous lobes, posterior lobe disc shaped (fig. 16C, D); 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, much more heavily sclerotized than sternum. AB- DOMEN: 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 1/2 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 longer than femur; cymbium dark red-brown; bulb dark redbrown, more than two times as long as cymbium, stout; embolic region obtusely bent, stout, not tapered distally, without enlarged or complex processes (fig. 16A, B).

FEMALE (PBI_OON 25960, figs. 15D–F, I, 16F). Total length 1.65. 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 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. 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 rounded, heavily sclerotized process overhanging anterior section with very slight indent or rounded edge; convoluted duct thicker than apodemes, strong horizontal scleriotization anterior to epigynal atrium clearly joins posteriorly directed lateral apodemes (figs. 15I, 16F).

OTHER MATERIAL EXAMINED: AUS- TRALIA: Queensland: Daintree National Park, Cape Tribulation, Mount Sorrow , rainforest, leaf litter, 200 m, 16.07833 ° S, 145.46166 ° E, Apr. 19, 2009 (H. Wood, CAS 9031343 , PBI _ OON 5638 ), 1 ³, 1 ♀ ; Daintree National Park, Cape Tribulation, Mount Sorrow , rainforest, leaf litter, 200 m, 16.07833 ° S, 145.46166 ° E, Apr. 19, 2009 (H. Wood, CASENT 9035035–9035036), 2 ³, 1 ♀ ; Daintree National Park ; Cape Tribulation area, Marrdja boardwalk rainforest loop., rainforest, leaf litter, 16.13555 ° S, 145.43944 ° E, Apr. 6, 2009 (K. Edward and J. Waldock, QM S95919 , PBI _OON 26305), 1 ♀ ; Daintree National Park ; Cape Tribulation section, near Jindalba walk, rainforest, leaf litter, 16.23722 ° S, 145.43305 ° E, Apr. 6, 2009 (K. Edward and J. Waldock, QM S95920 , PBI _ OON 5681 ), 1 ♀ ; Alexandra Range, Daintree , rd summit, rainforest, leaf litter, 250 m, 16.25000 ° S, 145.43330 ° E, Oct. 13, 1980 (G. Monteith, QM S12963 , PBI _OON 25779), 1 ♀ ; Cape Tribulation, 1.5 km W ( Site 3), rainforest, leaf litter, 150 m, 16.08333 ° S, 145.46670 ° E, Apr. 21, 1983 (G. Monteith, D. Yeates, QM S16094 , PBI _OON 25776), 1 ♀ ; Cape Tribulation, 1.5 km W ( Site 3), rainforest, leaf litter, 150 m, 16.08333 ° S, 145.46670 ° E, Jan. 1–31, 1983 (G. Monteith, QM S16073 , PBI _OON 25777), 1 ³ ; Cape Tribulation, 2 km W ( Site 4), rainforest, leaf litter, 200 m, 16.08333 ° S, 145.46670 ° E, Oct. 7, 1982 (G. Monteith, D. Yeates, G. Thompson, QM S16089 , PBI _OON 25772), 1 ♀ ; Cape Tribulation, 2 km W ( Site 4), rainforest, leaf litter, 200 m, 16.08333 ° S, 145.46670 ° E, Jan. 2, 1983 (G. Monteith, QM S16080 , PBI _OON 25775), 1 ♀ ; Cape Tribulation, 3.5 km W ( Site 7), rainforest, leaf litter, 680 m, 16.08333 ° S, 145.45000 ° E, Jan. 1–31, 1983 (G. Monteith, QM S16079 , PBI _OON 25773), 1 ♀ ; Cape Tribulation, 4.5–5 km W ( Top Camp ), rainforest, leaf litter, 770 m, 16.08333 ° S, 145.43330 ° E, Oct. 1, 1982 (G. Monteith, D. Yeates, G. Thompson, QM S16066 , PBI _ OON 25774), 1 ♀ ; Cape Tribulation, 4.5 km W ( Site 9), rainforest, leaf litter, 760 m, 16.08333 ° S, 145.43330 ° E, Jan. 1–31, 1983 (G. Monteith, QM S95921 , PBI _OON 25771), 1 ♀ ; Karnak-Devils Thumb, 8–12 km NW Mossman ( Site 5), rainforest, 440 m, 16.38333 ° S, 145.28330 ° E, Dec. 26, 1989, to Jan. 15, 1990 ( ANZSES expedition, QM S25132 , PBI _OON 21972), 1 ³ ; Mossman Bluff (site 5), rainforest, 760 m, 16.47083 ° S, 145.29150 ° E, Dec. 20, 1989, to Jan. 15, 1990 (G. Monteith, G. Thompson, ANZSES, QM S60813, PBI _OON 22064), 1 ♀ ; Mossman Bluff Track, 5–10 km W Mossman ( Site 3), rainforest, 480 m, 16.41667 ° S, 145.33330 ° E, Dec. 20, 1989, to Jan. 15, 1990 (G. Monteith, G. Thompson, ANZSES Expedition, QM S41551 , PBI _OON 21725), 1 ♀ ; Mossman Bluff Track, 5–10 km W Mossman ( Site 4), rainforest, 600 m, 16.65000 ° S, 145.56670 ° E, Dec. 20, 1989, to Jan. 15, 1990 (G. Monteith, G. Thompson, ANZSES Expedition, QM S72950 , PBI _OON 21993), 1 ³, 1 ♀ ; Mount Demi summit, 7 km SW Mossman, rainforest, 1100 m, 16.50000 ° S, 145.31670 ° E, Dec. 17, 1995, to Jan. 25, 1996 (G. Monteith, G. Thompson, Ford, QM S44688 , PBI _OON 25815), 1 ³ ; Mount Finnigan , rainforest, 950 m, 15.81667 ° S, 145.28330 ° E, Apr. 19–22, 1982 (G. Monteith, D. Yeates, D. Cook, QM S12982 , PBI _OON 25888), 1 ³ ; Mount Finnigan summit, via Helenvale , rainforest, 1100 m, 15.81667 ° S, 145.28330 ° E, May 28–30, 1985 (G. Monteith, D. Cook, QM S16029 , PBI _OON 25766), 1 ³ ; Mount Finnigan, Summit , rainforest, 1100 m, 15.81666 ° S, 145.28333 ° E, Nov. 21, 1998 (G. Monteith, QM S78897, PBI _OON 20880), 2 ♀ ; Mount Hartley summit, rainforest, 750 m, 15.76667 ° S, 145.31670 ° E, Nov. 8, 1995 – Jan. 16, 1996 (G. Monteith, D. Cook, L. Roberts, QM S38626 , PBI _OON 21774), 1 ♀ ; Mount Lewis , rainforest, litter berlese, 960 m, 16.35000 ° S, 145.17000 ° E, Oct. 30, 1976 (R.W. Taylor and A. Weir, ANIC, PBI _ OON 5844 ), 1 ♀ ; Mount Lewis Road ( Hut ), rainforest, 1200 m, 16.51667 ° S, 146.26670 ° E, July 14, 1996 (G. Monteith, QM S43173 , PBI _OON 21766), 1 ♀ ; Mount Lewis Road , 29 km from highway, rainforest, leaf litter, 1210 m, 16.51167 ° S, 145.27000 ° E, Nov. 29, 1997 (D. Clyne, QM S35952 , PBI _OON 21784), 2 ♀ ; Mount Misery , ascent road, rainforest, 730 m, 15.87317 ° S, 145.20970 ° E, Dec. 6, 1990, to Jan. 17, 1991 (QLD Museum, ANZSES, QM S60283 , PBI _OON 22210), 1 ♀ ; Mount Pieter- Botte , 0.5 km E, rainforest, leaf litter, 780 m, 16.08333 ° S, 145.38330 ° E, Oct. 5, 1982 (G. Monteith, D. Yeates, G. Thompson, QM S16046 , PBI _OON 25829), 1 ♀ ; Mount Windsor Uplands, Mount Windsor Road , rainforest, leaf litter, 1080 m, 16.26583 ° S, 145.05916 ° E, Apr. 3, 2009 (K. Staunton, QM S95922 , PBI _ OON 5578 ), 2 ♀ ; Noah Creek , rainforest, in litter, 16.07000 ° S, 145.25000 ° E, June 21, 1971 (Feehan Taylor, ANIC, PBI _ OON 5841 ), 1 ♀ ; Noah Head , S Cape Tribulation, rainforest, leaf litter, 40 m, 16.13333 ° S, 145.45000 ° E, Oct. 16, 1980 (G. Monteith, QM S12959 , PBI _OON 25778), 2 ♀ ; SW slope of Mount Hartley , rainforest, 750 m, 15.76667 ° S, 145.31670 ° E, Nov. 8, 1995, to Jan. 16, 1996 (G. Monteith, D. Cook, L. Roberts, QM S46886 , PBI _OON 21773), 1 ³ ; Windsor Tbld , 35 km NNW Mount Carbine, rainforest, leaf litter, 1150 m, 16.25000 ° S, 145.13330 ° E, Apr. 26, 1982 (G. Monteith, D. Yeates, D. Cook, QM S16077 , PBI _OON 25898), 2 ♀ .

DISTRIBUTION: This species is known only from the northern subregions of the Wet Tropics Bioregion (CU, WU, FU, TU, and TL) in northeastern Queensland (map 5).

Figures

Fig. 15. Ischnothyreus tragicus, sp. nov. Holotype male (PBI_OON 00025961): A. habitus, dorsal view; B. habitus, ventral view; C. habitus, lateral view; G. carapace, anterior view; H. sternum, ventral view. Paratype female (PBI_OON 00025755): D. habitus, dorsal view; E. habitus, ventral view; F. habitus, lateral view; I. epigynum, ventral view.

Fig. 16. Ischnothyreus tragicus, sp. nov. Holotype male (PBI_OON 00025961): 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. Paratype female (PBI_OON 00025755): F. epigynum, ventral view. Scale lines 5 0.1 mm.