Cavisternum ewani, Baehr & Harvey & Smith, 2010

Baehr, Barbara C., Harvey, Mark S. & Smith, Helen M., 2010, The Goblin Spiders of the New Endemic Australian Genus Cavisternum (Araneae: Oonopidae), American Museum Novitates 3684, pp. 1-40 : 22-25

Cavisternum ewani , new species

Figures 2, 5, 8 , 103–114 , map 3

TYPES: AUSTRALIA: Queensland: Male holotype from Great Basalt Walls National Park , 19 ° 14 9 33 0 S, 146 ° 28 9 22 0 E, pitfall trap array, open forest, 420 m (27 Sept.–17 Dec. 2006, R. Raven, B. Baehr) (PBI_OON 00006013), deposited in QM (S81339) . Female allotype from Rochford Scrub , 20 ° 06 9 58 0 S, 146 ° 35 9 38 0 E, pitfall (11 Dec. 2006 – 11 Feb. 2007, R. Raven, B. Baehr, A. Amey) (PBI_OON 00006276), deposited in QM (S76771) . Paratypes: 4 males from Lords Table , SE base, site 2, 22 ° 40 9 30 0 S, 148 ° 01 9 12 0 E, 13 Jan. 2006, C. Burwell, 1 male deposited in each of AM (PBI_OON 00023369, KS106292) , AMNH (PBI_OON 00023370), WAM (PBI_OON 00023371, T95023) , remain- der in QM (PBI_OON 00021624, S73500 ) .

ETYMOLOGY: The specific name is a patronym in honor of Ewan Jay Martyr McLean, the son of Stacey McLean, Senior Program Officer, Biodiversity Planning, Environment and Parks Branch, Brisbane City Council.

DIAGNOSIS: Males of C. ewani resemble those of C. toadshow with the sternal concavity occupying most of the sternal length, and the epigastric scutum not protruding (fig. 5). However, males of C. ewani can be easily separated from all other species by their broad field of clavate setae covering almost the whole width of the sternum (fig. 8). Females can be easily distinguished from all other Cavisternum species by their large elliptical membranous epigastric area (fig. 113).

MALE: Total length 1.07. Carapace 0.50 long, 0.39 wide; abdomen 0.57 long, 0.33 wide. Carapace, sternum, mouthparts, and abdominal scutae pale orange, legs yellow. Sternum longer than wide, median concavity occupying most of sternal length, with U-shaped field of

Dorsal view. 111. Retrolateral view. 112. Embolus, retrolateral view. Scales: 20 m m.

clavate setae, anterior margin of setae rectangular (fig. 8). Chelicerae slightly divergent, fangs, extremely long, slightly longer than paturon, directed posteriorly and crossed (figs. 106, 107). Abdomen ovoid. Epigastric scutum not protruding (fig. 5). Cymbium-bulb complex pear shaped, bearing a long, thin, medially bent embolus at its apex (figs. 109–112).

FEMALE: Total length 1.21. Carapace 0.46 long, 0.38 wide; abdomen 0.75 long, 0.32 wide. Coloration as in male. Epigastric fold with one large elliptical area, copulatory duct narrow in the middle and widened at both ends (figs. 113, 114).

OTHER MATERIAL EXAMINED: AUSTRALIA: Queensland: 16 km N of Warremba , 24 ° 54 9 09 0 S, 148 ° 35 9 36 0 E, 331 m, 27 June–6 Sep. 2006, R. Raven, B. Baehr, A. Amey, 1 ³ (PBI_OON 00006214, QM S75256) ; 19 km NW of Wrotham Park Stn, Burketown Dvt Road , 16 ° 31 9 43 0 S, 143 ° 53 9 38 0 E, 188 m, 12 July–26 Sep. 2006, R. Raven, B. Baehr, A. Amey, 1 ³ (PBI_OON 00006156, QM S75182) . Dunbar E of Lynd River on Burketown Dvt Road, 16 ° 21 9 48 0 S, 143 ° 03 9 11 0 E, 91 m, 12 July–26 Sep. 2006, R. Raven, B. Baehr, A. Amey, 2 ³ (PBI_OON 00006237, QM S75305 ) . Killymoon Creek , S of Townsville, 19 ° 24 9 S, 147 ° 01 9 E, 27 July–2 Dec. 1992, R. Raven, P. Lawless, E. Lawless, M. Shaw, 1 ³ (PBI_OON 00020956, QM S75577 ) , 26 Oct. 1991 – 27 July 1992, 1 ³, 1 ♀ (PBI_OON 00020998, QM S79583 ) . Lake Broadwater via Dalby , 27 ° 21 9 S, 151 ° 06 9 E ° E, 17 May–25 Nov. 1985, M. Bennie, 1 ³ (PBI_OON 00020832, QM S79449) . Lords Table , SE base, site 2, 22 ° 40 9 30 0 S, 148 ° 01 9 12 0 E, 13 Jan. 2006, C. Burwell, 1 ³ (PBI_OON 00020038, QM S80257) , 1 ³ (PBI_OON 00020045, QM S73497) . Red Falls , 19 ° 55 9 47 0 S, 145 ° 44 9 00 0 E, 360 m, 16 Dec. 2006, R. Raven, B. Baehr, A. Amey, 1 ³ (PBI_OON 00006012, QM S81342) . Roper Creek, via Coomburragee , site 3, 22 ° 54 9 16 0 S, 148 ° 20 9 00 0 E, 300 m, 11 Jan. 2006, C. Burwell, 1 ³ (PBI_OON 00020031, QM S80091 ) . SW along Alternate Savannah Way , SE of Chillagoe, 17 ° 29 9 30 0 S, 144 ° 36 9 53 0 E, 460 m, 13 July–27 Sep. 2006, R. Raven, B. Baehr, A. Amey, 1 ³ (PBI_OON 00006072, QM S75099) ; same data but 2 ³, 1 ♀ (PBI_OON 00023368, AM KS106290, one male used for SEM). Taroom district BS 24, 25 ° 35 9 59 0 S, 149 ° 46 9 11 0 E, June – 11 Sep. 1996, P. Lawless, H. Janetzki, D. Cook, 1 ³ (PBI_OON 00006976, QM S72962 ) .

DISTRIBUTION: This species is widely distributed in drier areas of eastern Queensland (map 3).

Figures

Figs. 1–9. Cavisternum species, males. 1–3: habitus, dorsal view; 4–6: habitus, lateral view; 7–9: sterna and chelicera, ventral view. 1, 4, 7. C. clavatum (PBI_OON 04906). 2, 5, 8. C. ewani (PBI_OON 06013). 3, 6, 9. C. michaelbellomoi (PBI_OON 06003).

Figs. 103–108. Cavisternum ewani, new species, male (PBI_OON 23368). 103. Carapace, dorsal view. 104. Carapace, lateral view. 105. Carapace frontal. 106. Sternum, ventral view. 107. Chelicerae, ventral view. 108. Clavate setae. Scales: figs. 103–106, 100 mm; figs. 107, 108, 20 mm.

Figs. 109–112. Cavisternum ewani, new species, male palp (PBI_OON 23368). 109. Prolateral view. 110.

Figs. 113, 114. Cavisternum ewani, new species, female epigyne (PBI_OON 06072). 113. Ventral view; elliptical membranous area indicated. 114. Dorsal view.