Cavisternum bertmaini, 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 : 18-19

Cavisternum bertmaini , new species

Figures 12 , 90–94 , map 1

TYPES: AUSTRALIA: Western Australia: Male holotype from Cape Bougainville , site 6/ 2 (FN7), 13 ° 54 9 S, 126 ° 05 9 E (10 June 1988,

A.R. Main) (PBI_OON 00005440), deposited in WAM T90/974. Female allotype, collected with holotype (PBI_OON 00005439), deposit- ed in WAM (T90/976). Paratypes: 1 male, 2 females from same location (3 June 1988, A.N. Andersen) (PBI_OON00005441) deposited in WAM (T90/966–968) .

ETYMOLOGY: The specific name is a patronym in memory of Albert (Bert) R. Main, collector of the holotype, in recognition to his enormous contributions to ecology and taxonomy.

DIAGNOSIS: Males of C. bertmaini resemble those of C. digweedi , with the sternal concavity occupying about half the sternal length (fig. 12) and the epigastric scutum strongly protruding. Males of C. bertmaini can be easily separated, however, by their pear-shaped cymbium-bulb complex, and the thin, medially bent embolus with small club-shaped basal process (figs. 90– 92). Females can be distinguished from all other Cavisternum species by their narrow copulatory duct, ending level with the tracheal groove (figs. 93, 94).

MALE: Total length 1.09. Carapace 0.52 long, 0.41 wide; abdomen 0.57 long, 0.35 wide. Carapace, sternum, mouthparts, and abdominal scutae pale orange, legs yellow. Sternum as long as wide, concavity small in posterior median part of sternum, with drop-shaped field of clavate setae covering about M of sternum width and K of sternum length (fig. 12). Cheliceral fangs elongated, tips bent posteromedially forming V shape, tip widened distally (fig. 12). Abdomen ovoid, epigastric scutum strongly protruding. Cymbium-bulb complex pear shaped bearing a long, medially bent embolus with a small club-shaped basal process (figs. 90–92).

FEMALE: Total length 1.20. Carapace 0.50 long, 0.39 wide; abdomen 0.70 long, 0.31 wide. Coloration as in male. Epigastric area with dark, circular copulatory opening and narrow copulatory duct, ending at level of tracheal groove (figs. 93, 94).

DISTRIBUTION: This species is found at Cape Bougainville in the Kimberley region of Western Australia (map 1). Cavisternum bertmaini was listed as Oonopidae sp. 02 by Main (1991).

Figures

Figs. 10–17. Cavisternum species, males, sterna and chelicerae, ventral view. 10. C. bagleyae (PBI_OON 06235). 11. C. barthorum (PBI_OON 06073). 12. C. bertmaini (PBI_OON 05440). 13. C. carae (PBI_OON 05434). 14. C. digweedi (PBI_OON 05438). 15. C. foxae (PBI_OON 06069). 16. C. gatangel (PBI_OON 06070). 17. C. heywoodi (PBI_OON 07474).

Figs. 90–94. Cavisternum bertmaini, new species. 90–92. Male palp (PBI_OON 05440). 90. Prolateral view. 91. Retrolateral view. 92. Dorsal view. 93, 94. Female epigyne (PBI_OON 05441). 93. Ventral view. 94. Dorsal view.