Orchestina obscura Chamberlin and Ivie, 1942

Izquierdo, Matías Andrés & Ramírez, Martín J., 2017, Taxonomic Revision Of The Jumping Goblin Spiders Of The Genus Orchestina Simon, 1882, In The Americas (Araneae: Oonopidae), Bulletin of the American Museum of Natural History 2017 (410), pp. 1-1 : 1-

Orchestina obscura Chamberlin and Ivie, 1942

Figures 5 , 15G–I , 20E, F , map 1

Orchestina obscura Chamberlin and Ivie, 1942: 6 , fig. 4 (male holotype from the United States: California, Mariposa Co.: Yosemite Park (37.83722°, -119.54028°), May 08, 1931, A.M. Woodbury, deposited in AMNH, PBI_ OON 42747; examined).

DIAGNOSIS: Males resemble those of O. utahana by the general shape of the palp and the presence of cuticular projections on cheliceral promargins, but the embolus is slightly thinner and more sinuous than in that species (fig. 15G– I); the carapace is more rounded in O. utahana and in that species the PME are also larger. As its name indicates, males of O. obscura are darker than any other United States species (fig. 5).

MALE (PBI_OON 42747): Total length 1.33.

CEPHALOTHORAX: Carapace dark orange or brown, with netlike pattern. Sternum with dark stripe on anterior median half. Cheliceral promargins with cuticular projections (fig. 5B, arrow). Labium slightly darker than sternum. Endites without serrula. ABDOMEN: Dorsum with gray netlike pattern. LEGS: Only right legs I, II, left leg IV present. GENITALIA (figs. 15G–I, 20E, F): Palp yellow; bulb yellow, spherical; embolus short, dark; sperm duct with only one loop.

FEMALE: Unknown.

DISTRIBUTION: Known only from the type locality in the United States (California, map 1).

OTHER MATERIAL EXAMINED: None.

Figures

FIGURE 5. Orchestina obscura, habitus of male holotype. A. Dorsal. B. Anterior; arrow points to the cuticular projections of promargin of chelicerae. C. Lateral. Scale bars: 0.2 mm. (PBI_OON 42747).

FIGURE 15. Orchestina spp., male palps. A–C. O . utahana. D–F. O . moaba. G–I. O . obscura. A, D, G. Prolateral. B, E, H. Dorsal. C, F, I. Retrolateral. Scale bars: 0.2 mm. (PBI_OON 1076, 1073, 42747).

FIGURE 20. Orchestina spp., drawings of palp of males. A, B. O . utahana. C, D. O . moaba. E, F. O . obscura. G, H. O . quasimodo. I–K. O . kamehameha. L, M. O . saltitans. N, O. O . pavesiiformis. A, C, E, G, I, K, L, N. Prolateral. B, D, F, H, J, M, O. Dorsal. Scale bars: 0.1 mm. (PBI_OON 1317, 42824, 42747, 38005, 38004, 42587, 42271).