Oropodes yollabolly Chandler, 2003

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 : 437

4 Oropodes yollabolly Chandler, 2003 Figs 522Map 1

Oropodes yollabolly Chandler, 2003: 584. Type locality: California: Tehama County, Grindstone Canyon, 7 mi W Log Springs, Mendocino National Forest. Holotype male (FMNH).

Specimens examined.

35, all DSC: CALIFORNIA: Tehama County: 32 Paratypes, Mendocino National Forest, 7 mi W Log Springs, Grindstone Canyon, 1326 m, XII-3-1991, D. S. Chandler, sift Douglas-fir litter by stream; 2 Paratypes, Mendocino National Forest, 6 mi W Log Springs, 1585 m, XI-29-1986, D. S. Chandler, sift maple, Avens , and oak leaf litter.

Description.

Length 1.88-2.20 mm. Body light orange-brown. Eyes with 17-23 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 posteromesal margins of metacoxal cavities posteriorly to ventrite apex.

Males: Metasternum with shallow median longitudinal impression. Legs (Fig. 5B): profemora simple; protibiae slightly swollen to middle; mesotibiae with blunt preapical tubercle on mesal margin; metatibiae with small acute apical tubercle on mesal margin. Abdomen (Figs 5C, 22) with second ventrite depressed at medial fifth from middle to apex; third ventrite 0.60 wide, shallowly concave at medial third anterior to lamina, lamina 0.11 wide, apex broadly rounded, arising at point about two-thirds length of ventrite, strongly angled anteriorly at about 30°; fourth ventrite shallowly concave at medial third; fifth ventrite slightly depressed in basal third at middle; sixth ventrite (Fig. 5D) with posterior margin of setose area gradually narrowing to middle at about two-thirds lateral width. Aedeagus (Fig. 5A) 0.44 long; with parameres evenly rounded at apex; internal sac with single large acute spine at apex.

Females: Fifth tergite with setose area convex; fifth ventrite (Fig. 5F) with transverse margins of setose area parallel, irregular row of long setae present; ventrites all broadly convex at middle. Female genitalia (Fig. 5E) with median lobe elongate, membranous.

Collection notes.

This species was found in mixed leaf litter at a relatively cold and wet site within the Ponderosa pine zone of the Coast Ranges during the winter.

Geographical distribution.

(Map 1): This species is only known from western Tehama County in the Coast Ranges near the crest separating the eastern Sacramento River drainage from the western Eel River drainage.

Comparisons and diagnostic notes.

Placed as a member of the arcaps-group, and sharing with Oropodes arcaps and Oropodes ishii the anteriorly convex and medially placed lamina of the third ventrite. It is most similar to Oropodes ishii in sharing a preapical tubercle on the mesal margin of the mesotibiae and metatibiae with an apical spur in the males, and for the females the elongate membranous lobe of the genitalia without any spines. The males of these two species are easily separated by the nearly parallel margins of the s etose area of the sixth ventrite in Oropodes yollabolly . The female characters are similar, and the species may be separated only by their distribution in the Coast Ranges, versus being in the northern Sierra Nevada for Oropodes ishii .