Ischnothyreus bualveus, 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 : 91-92

Ischnothyreus bualveus , new species Figure 53 , map 7

TYPES: AUSTRALIA: Queensland: Female holotype and one female paratype from Baldy Mountain, SW. of Atherton, 17.26666 ° S, 145.41666 ° E, 1200 m (10 Oct 1980, G. Monteith), deposited in QM ( S12956 , PBI_OON 00025963).

ETYMOLOGY: The specific epithet is derived from the Latin bu and alveus meaning ‘‘large cavity’’ ( Brown, 1956), and refers to the extremely large epigynal atrium of the female epigynum region of this species.

DIAGNOSIS: The female has a uniquely shaped epigynal atrium, which consists of an incredibly large, U-shaped depression and extends the entire length of the convoluted duct (fig. 53B, C).

MALE: Unknown.

FEMALE (PBI_OON 25963, fig. 53A–C). Total length 1.68. CEPHALOTHORAX: Carapace pale orange, broadly oval in dorsal view, pars cephalica slightly elevated in lateral view, anteriorly narrowed to 0.49 times its maximum width or less, surface of elevated portion of pars cephalica finely reticulate, sides finely reticulate. Clypeus straight in front view, high, ALE separated from edge of carapace by their radius or more; setae light. Eyes: ALE circular, PME oval, PLE oval; posterior eye row straight from above; ALE separated by less than their radius, ALE-PLE separated by less than ALE radius. Sternum as long as wide, pale orange; setae dark, evenly scattered. Chelicerae, endites, and labium yellow. Chelicerae straight; setae light; Labium elongated hexagon, anterior margin indented at middle; with six or more setae on anterior margin. ABDOMEN: Ovoid, dorsum soft portions white. Book lung covers ovoid. Dorsal scutum pale orange, covering 1/2 to 3/4 of abdomen, between 1/4 and 1/2 abdomen width, middle surface smooth, sides smooth. Epigastric scutum small lateral sclerites present. Postepigastric scutum yellow, short, only around epigastric furrow. LEGS: Yellow, 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: Ventral view: epigynal atrium incredibly large, U-shaped, posterior portion with small triangular projection, edges extend entire length of convoluted duct (fig. 53B, C); convoluted duct thicker and longer than apodemes.

OTHER MATERIAL EXAMINED: AUS- TRALIA: Queensland: Baldy Mountain, Herberton Range SF, 17.26666 ° S, 145.41666 ° E, Dec. 5, 1977 (R.I. Storey, ANIC, PBI_OON 5933), 2 ♀.

DISTRIBUTION: This species is known only from Baldy Mountain on the Atherton Tablelands (AU) of the Wet Tropics Bioregion, in northeastern Queensland (map 7).

Figures

Fig. 53. Ischnothyreus bualveus, sp. nov. Holotype female (PBI_OON 00025963): A. habitus, dorsal view; B. habitus, ventral view; C. epigynum, ventral view. Scale lines 5 0.1 mm.