Ischnothyreus nourlangie, 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 : 20-21

Ischnothyreus nourlangie , new species Figure 6 , map 2

TYPE: AUSTRALIA: Northern Territory: Female holotype from Kakadu National Park, Nourlangie Area, walktrail, 12.86444 ° S, 132.815 ° E (28 Apr. 2008, K. Edward and P. Cullen), deposited in MAGNT ( PBI _OON 00025694).

ETYMOLOGY: The specific epithet is a noun in apposition, taken from the type locality.

DIAGNOSIS: Females of I. nourlangie , sp. nov., are quite similar to I. culleni , sp. nov. (fig. 10F), and I. monteithi , sp. nov. (fig. 59F), as they all have a very simple epigynal region, with no discerning epigynal atrium. However I. nourlangie , sp. nov., can be distinguished by a uniformly colored olive green carapace, a broad dorsal scute, covering 3/4 to most of the abdomen width, and a small teardrop-shaped process at posterior end of a thin, convoluted duct (fig. 6A, E, F).

MALE: Unknown.

FEMALE (PBI_OON 25694, fig. 6A–F). Total length 1.55. CEPHALOTHORAX: Carapace olive green, 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, low, ALE separated from edge of carapace by less than their radius; setae dark. Eyes: ALE circular, PME oval, PLE oval; posterior eye row procurved from above; ALE touching, ALE-PLE touching. Sternum longer than wide, yellow; setae dark, evenly scattered. Chelicerae, endites, and labium yellow; setae dark. 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 elliptical. Dorsal scutum live green, covering 1/ 2 to 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, widely hexagonal, only around epigastric furrow. Dorsum, epigastric area, and postepigastric area setae dark. LEGS: Pale orange, femora and basal half of tibiae darkened; 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: Ventral view: epigynal region very simple, without distinct atrium; convolut- ed duct extends posteriorly to small teardropshaped process (fig. 6E, F).

OTHER MATERIAL EXAMINED: None.

DISTRIBUTION: This species is only known from Nourlangie Rock in Kakadu National Park, Northern Territory (map 1).

Figures

Fig. 6. Ischnothyreus nourlangie, sp. nov. Holotype female (PBI_OON 00025694): A. habitus, dorsal view; B. habitus, ventral view; C. habitus, lateral view; D. carapace, anterior view; E. epigynum, ventral view; F. epigynum, ventral view. Scale lines 5 0.1 mm.