Ischnothyreus puruntatamerii, 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 : 13-18

Ischnothyreus puruntatamerii , new species Figures 1–4 , map 2

TYPES: AUSTRALIA: Northern Territory: Male holotype and female allotype from rainforest alongside spring-fed creek, Tiwi Islands, Bathurst Island , Mangupulu Jungle , 11.52527 ° S, 130.29833 ° E (12 May 2008, K. Edward and P. Cullen), deposited in MAGNT (³ holotype: MAGNT PBI _ OON 5893 ; ♀ allotype: MAGNT PBI _ OON 5894 ) .

ETYMOLOGY: The specific name is a patronym in honor of Tiwi Island elder, Leon Puruntatameri.

DIAGNOSIS: Males of this species can be easily recognized by the the unique shape of the embolic region of the palp, which is obtusely bent at right angles and slightly twisted subdistally (fig. 4A, B). Males also possess a distinct rounded bump on the basal part of the fang (fig. 4C, D). The female epigynal region consists of a uniquely squareshaped epigynal atrium (fig. 3F) and thin convoluted duct (figs. 1I, 4F). The lateral margins of the carapace in both sexes are dark olive green with the elevated portion of pars cephalica orange-brown (fig. 1A, D).

MALE (PBI_OON 5893, figs. 1A–C, G–H, 4A–E; paratype ³: figs. 2A, B, D, 3A, B, E). Total length 1.27. CEPHALOTHORAX: Carapace lateral margins dark olive green, elevated portion of pars cephalica orangebrown, ovoid in dorsal view, pars cephalica slightly 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 smooth, sides strongly reticulate. Clypeus straight in front view, low, ALE separated from edge of carapace by less than their radius; setae dark. Eyes: posterior eye row, as viewed from above very slightly procurved, ALE largest, ALE circular, PME oval, PLE circular; posterior eye row procurved from above; ALE touching, ALE-PLE touching (fig. 2A, paratype ³). Sternum as long as wide, pale orange, uniform, setae dark, evenly scattered. Chelicerae, endites, and labium pale orange. Chelicerae straight, anterior face unmodified, promargin of chelicerae with one larger denticle; fang shape normal, with prominent basal process (fig. 2D, paratype ³); setae dark, evenly scattered; paturon inner margin with scattered setae. Labium elongated hexagon, not fused to sternum, anterior margin not indented at middle, same as sternum in sclerotization; with six or more setae on anterior margin. Endites distally not excavated, anteromedian tip unmodified, same as sternum in sclerotization. ABDOMEN: Ovoid; dorsum soft portions white. Book lung covers ovoid. Dorsal scutum olive green, 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. Post- epigastric scutum pale orange, covering about 2/3 of abdominal length. 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, 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 brown; embolus dark; femur shorter than trochanter; patella about as long as femur; cymbium brown; bulb brown, 1 to 1.5 times as long as cymbium, stout; embolic region divided into two distinct processes or lobes, larger distal process (approximately 1/2 length of bulb) obtusely bent at right angle to rest of palpal

bulb, broad, rounded and slightly twisted distally (fig. 2B, paratype ³), smaller lateral process rounded. Apparent embolus opening on ventral surface of distal lobe above a small, heavily sclerotized triangular pointed structure (fig. 4A, B).

FEMALE (PBI_OON 5894, figs. 1D–F, I, 4F; paratype ♀: figs. 2C, E, F, 3C, D, F). Total length 1.65. CEPHALOTHORAX: Carapace broadly oval in dorsal view, anteriorly narrowed to 0.49 times its maximum width or less. ABDOMEN: Dorsal scutum covering about 1/2 of abdomen, between 1/4 and 1/2 abdomen width. Postepigastric scutum widely hexagonal, covering about 1/3 of the abdominal length. LEGS: 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 large, almost square shaped, very small triangular process overhanging anterior portion; convoluted duct much thinner than apodemes (figs. 1I, 4F).

OTHER MATERIAL EXAMINED: AUS- TRALIA: Northern Territory: Tiwi Islands, Bathurst, Big Pig Jungle , wet rainforest, moist litter, 11.50833 ° S, 130.33472 ° E, May 13, 2008 (K. Edward and P. Cullen, MAGNT, PBI _OON 25707, 25708 ), 1 ³, 1 ♀ ; Tiwi Islands, Bathurst, Illinga Jungle , wet rainforest, moist litter, 11.55916 ° S, 130.32138 ° E, May 15, 2008 (K. Edward and P. Cullen, MAGNT, PBI _OON 25712, 25713 ), 4 ³, 4 ♀ ; Tiwi Islands, Bathurst, Illinga West , wet rainforest, moist litter, 11.52305 ° S, 130.31083 ° E, May 14, 2008 (K. Edward and P. Cullen, MAGNT, PBI _OON 25710, 25711 ), 2 ³, 5 ♀ ; same data ( WAM T130758 ), 1 ³, 2 ♀ ; Tiwi Islands, Bathurst, Little Pig Jungle , wet rainforest, moist litter, 11.52527 ° S, 130.33527 ° E, May 13, 2008 (K. Edward and P. Cullen MAGNT, PBI _OON 25709), 1 ♀ ; Tiwi Islands: Bathurst, Mangupulu Jungle , spring fed Creek , moist litter, 11.52527 ° S, 130.29833 ° E, May 12, 2008 (K. Edward and P. Cullen, MAGNT, PBI _OON 25705, 25706 ), 3 ³, 2 ♀ .

DISTRIBUTION: This species is only known from Bathurst Island (Tiwi Islands), Northern Territory (map 1).

Figures

Fig. 1. Ischnothyreus puruntatamerii, sp. nov. Holotype male (PBI_OON 5893): A. Habitus, dorsal view; B. habitus, ventral view; C. habitus, lateral view; G. carapace, anterior view; H. sternum, ventral view. Allotype female (PBI_OON 5894): D. habitus, dorsal view; E. habitus, ventral view; F. habitus, lateral view; I. epigynum, ventral view.

Fig. 2. Scanning electron micrographs of Ischnothyreus puruntatamerii, sp. nov. Paratype male (PBI_OON 25711): A. carapace, anterior view; B. palp, close-up of embolus; D. chelicerae, ventral view. Allotype female (PBI_OON 25710): C. habitus, ventral view; E. sternum, ventral view; F. mouthparts, endites, showing serrula.

Fig. 3. Scanning electron micrographs of Ischnothyreus puruntatamerii, sp. nov. Paratype male: A. spinnerets, posterior view (PBI_OON 25711); B. same (PBI_OON 25713); E. epigastric region, ventral view (PBI_OON 25711). Allotype female (PBI_OON 25710): C. spinnerets, posterior view; D. same; F. epigynum, ventral view.

Fig. 4. Ischnothyreus puruntatamerii, sp. nov. Holotype male (PBI_OON 5893): 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 5894): F. epigynum, ventral view. Scale lines 5 0.1 mm. Abbreviations: EmR, embolic region; PBu, palpal bulb; BP, basal process of fang; CvD, convoluted duct; EpA, epigynal atrium; Ap, apodeme.