Cybaeus sanbruno Bennett 2009

Figs 44–49, 67–68, 70

Cybaeus sanbruno Bennett in Copley et al. 2009: 383, Figs 54–60. World Spider Catalog 2019. Type material. Holotype ♂. U.S.A.: California: San Mateo County, San Bruno Mountain, Crystal Cave Canyon, 14 December 1980, D. Ubick (CAS), examined.

Other material examined. Specimens and locality data in Copley et al. (2009).

Diagnosis. The male of C. sanbruno is diagnosed by a combination of features of the patellar apophysis and the proximal arm of the tegular apophysis. The patellar apophysis has 13 peg setae in an antero-dorsal cluster (Fig. 45). The tip of the proximal arm of the tegular apophysis is bifid with the terminations pincer-like and convergent and there is a small but prominent, pointed dorsal keel (Figs 44, 67–68). The males of the two other adenes group species with a bifid tip of the proximal arm of the tegular apophysis either have the terminations divergent and an inconspicuous dorsal keel and, on the patellar apophysis, a larger number of peg setae ( C. adenes: Figs 1–2, 59–60) or have the terminations of the proximal arm of the tegular apophysis only weakly convergent and not pincer-like and the peg setae arranged more-or-less linearly along the tip and dorsal edge of the patellar apophysis ( C. schusteri: Figs 51, 65)

The female is distinguished by its inverted U-shaped atrium, widest posteriorly and with the posterior ends curved anteriorly (the latter feature is inconspicuous but visible in cleared epigynum using a compound microscope) (Figs 47–48). In addition the very short, thick-walled, contiguous (or nearly so) copulatory ducts (Figs 48–49) are diagnostic. None of the other adenes group females have atria or copulatory ducts of this form.

Description. See Copley et al. (2009). Palpal tibia with small retrolateral ridge anteriorly, dorsal to the carinate retrolateral tibial apophysis (Fig. 46).

Distribution and natural history. Known only from San Bruno Mountain, San Mateo County, in west central California (Fig. 70). See Copley et al. (2009).