Oropodes rumseyensis Grigarick & Schuster, 1976

Chandler, Donald S. & Caterino, Michael S., 2011, A taxonomic revision of the New World genus Oropodes Casey (Coleoptera, Staphylinidae, Pselaphinae), ZooKeys 147, pp. 425-477 : 456-458

17. Oropodes rumseyensis Grigarick & Schuster, 1976 Fig. 18Map 3

Oropodes rumseyensis Grigarick & Schuster, 1976, 100; Chandler 1997: 15. Type locality: California, Yolo County, 3 mi N Rumsey. Holotype male (UCDC). Grigarick & Schuster, 1980: pl. 29.

Specimens examined.

15: CALIFORNIA: Marin County: 2 km S Olema, 20 m, N38 00.5', W122 46', V-9/11-2003, S.B. Peck, mixed ravine forest, FIT (DSC). Napa County: 2 mi N St. Helena, White’s Cove entrance, IV-26/VIII-19-1981, R.L. Aalbu, antifreeze pit trap (CSCA, DSC). Napa, II-3-1959, R.O. Schuster (UCDC). Solano County: Mix Canyon, III-12-1960 (UCDC). Tehama County: Patton Mill, VIII-30-1960, R.O. Schuster (UCDC). Yolo County: 3 mi N Rumsey, VII-29-1959, R.O. Schuster & L.M Smith (DSC, 1 female paratype; UCDC, 1 male, 9 female paratypes).

Description.

Length 1.84-1.94 mm. Body light orange-brown. Eyes of both sexes with about 60 facets. Antennomeres V and VII slightly larger than those adjacent, V-VIII obconical, IX narrower than X. Abdomen with carinae of first ventrite extending from inner margin of metacoxal cavities to ventrite apex.

Males: Metasternum with median longitudinal impression. Legs (Fig. 18B): profemora with small blunt tubercle near base on mesal margin; protibiae slightly angularly swollen on mesal margin past middle; meso- and metatibiae with prominent apical spurs on mesal margin, spurs subequal in size. Abdomen (Fig. 18C) with second ventrite slightly depressed in medial fourth from middle to apex, with pair of widely separated rounded teeth on apical margin, teeth 0.16 apart between centers; third ventrite 0.62 wide, impressed in medial third, lamina 0.14 wide, arising near posterior margin of ventrite, angled at about 30°, apex of lamina shallowly emarginate; fourth-fifth ventrites slightly impressed in medial third; sixth ventrite (Fig. 18D) slightly impressed in medial fourth, with setose area slightly constricted at middle. Aedeagus (Fig. 18A) 0.48 long; left paramere broadly subtruncate at apex, right paramere with apex pointed obliquely laterally; internal sac with long sinuate rod, apex simple.

Females: Fifth tergite with blunt medial tubercle at apex, setose area transversely convex and bulging. Fifth ventrite (Fig. 18F) with setose area completely constricted at middle, margins meeting but not fused. Genitalia (Fig. 18E) strongly asymmetric, with large rounded lobe on right margin edged by arcuate sclerite.

Collection notes.

Taken from dry or scrub forests at low elevations.

Geographical distribution.

(Map 3): Most records are from the inner Coast Ranges extending from the San Francisco Bay Area north to Tehama County, with one specimen taken at the coast in Marin County.

Comparisons and diagnostic notes.

Placed as a member of the raffrayi-group. This species is most similar to Oropodes nuclere in the males sharing the broad tooth at the base of the profemora, only slightly swollen protibiae, with long apical spurs on the meso- and metatibiae, and the lamina of the third ventrite is angled at about 30°, while the female genitalia have a strongly asymmetric membranous lobe, and the fifth ventrite has the setose area divided. They differ by the males of Oropodes rumseyensis having an apically undivided rod in the internal sac and there is a cluster of denticles in the apical portion, while the females have the setose area of the fifth ventrite divided by projections of the anterior and posterior margins that meet but do not fuse and there is a blunt median tubercle at the apex of the fifth tergite. The males of Oropodes nuclere have an apically divided rod in the internal sac and the internal sac lacking a cluster of denticles in the apical portion, while the females have the setose area of the fifth sternite widely divided by a bar.