Cybaeus orarius Bennett, 2021

Bennett, Robb, Copley, Claudia & Copley, Darren, 2021, Cybaeus (Araneae: Cybaeidae) in the Nearctic: the devius and tardatus species groups of the Californian clade, Zootaxa 5026 (4), pp. 451-479 : 464-466

Cybaeus orarius Bennett spec. nov.

Figs 33–38 , 62

Type material. U.S.A.: California: Holotype female. San Luis Obispo County, Cambria , 2.iv.1960, W.J. Gertsch, W. Ivie, & Schrammel ( AMNH) . Paratypes. Monterey. 2♀, 4 mi. S of Gorda , 2.iv.1960, W.J. Gertsch, W. Ivie, & Schrammel ( AMNH) ; 3♀, Limekiln Creek , 30–31.v.1991, D. Ubick ( CAS) ; 1♀, 4 mi. N of the Monterey Co. line on Big Sur Hwy. [Hwy. 1], 10.ii.1967, V.D. Roth ( CAS) ; San Luis Obispo . 1♀, Cambria , 2.iv.1960, W.J. Gertsch, W. Ivie, & Schrammel ( AMNH) ; 1♀, 12 mi W of Hwy 101 on Hwy 46, 13.ii.1987, T. Briggs & V. Lee ( CAS) ; 2♀, 1 mi W of Los Osos Valley Rd on Prefumo Canyon Rd , 14.ii.1987, T. Briggs & V. Lee ( CAS) ; 1♀, Reservoir Canyon, San Luis Obispo , 15.viii.1959 V.D. Roth & W.J. Gertsch ( AMNH) .

Etymology. The specific name is a Latin adjective meaning “of the coast”.

Diagnosis. The male of C. orarius is unknown. The female of C. orarius is distinguished from the other tardatus species group females by its elongated spermathecal bases ( Figs 34–35, 37–38 ) (versus bases rounded in C. piazzai spec. nov. [ Figs 42–43, 45 ], C. tardatus [ Figs 50–51 ], and C. topanga spec. nov. [ Figs 53–54 ]).

Description. Ventral tibia I macrosetae 2-1p-2-1p-1p(or 0). Legs with femora and tibiae banded (San Luis Obispo County specimens) or not.

Female: (n=12). Atrium ( Figs 33, 36 ) difficult to discern, a concave area on epigynum with paired longitudinal atrial openings diverging posteriorly and area between openings slightly raised, convex. Vulva ( Figs 34–35, 37– 38 ) with copulatory ducts joined to atrial openings dorsally or dorso-laterally, contiguous anteriorly, diverging posteriorly then converging and turning anteriorly at posterior margin of vulva; heads of spermathecae ( Figs 35, 38 ) small dorsal lobes; spermathecal stalks proceeding anteriorly from heads for short distance then turning posteriorly before angling laterally to cross and join spermathecal bases; bases longitudinally elongated, about twice as long as wide, rounded anteriorly, gradually tapering into fertilization ducts posteriorly; Bennett’s glands located on dorsal surface of bases.

Measurements (n=6). CL 2.10–3.1 (2.6+0.4), CW 1.43–2.13 (1.76+0.27), SL 1.05–1.43 (1.24+0.14), SW 1.03– 1.38 (1.18+0.14). Holotype CL 2.23, CW 1.60, SL 1.17, SW 1.07.

Distribution and natural history. ( Fig. 62 ). Known only from an approximately 70 km length of coastal California from southwestern Monterey County to central San Luis Obispo County. Specimens have been recovered from oak leaf litter (Prefumo Canyon Road) and under rocks in a redwood forest (Limekiln Creek).

Figures

FIGURE 62. Distribution of Cybaeus orarius spec. nov., C. piazzai spec. nov., C. tardatus, and C. topanga spec. nov. AZ— Arizona, CA—California, ID—Idaho, OR—Oregon, NV—Nevada, UT—Utah, WA—Washington. California county names capitalized.

FIGURES 33–38. Cybaeus orarius spec. nov., females from California, copulatory organ (33–35 from Big Sur Highway, 36–38 from Cambria). 33, 36 Epigynum, ventral. 34–35, 37–38 Vulva (34, 37 ventral, 35, 38 dorsal). BG—Bennett’s gland, CD—copulatory duct, HS—head of spermatheca, SS—stalk of spermatheca.

FIGURES 42–45. Cybaeus piazzai spec. nov., females from California, copulatory organ (42–43 from Santa Barbara Natural History Museum grounds, 44–45 from “W119/N34”). 42–43 Vulva, ventral. 44 Epigynum, ventral. 45 Vulva, dorsal). CD— copulatory duct.

FIGURES 50–54. Cybaeus spp., females, copulatory organ (50–51 C. tardatus, holotype of Namopsilus pletus; 52–54 C. topanga spec. nov., from San Ysidro, California). 50–51, 53–54 Vulva (50, 53 ventral, 51, 54 dorsal). 52 Atrium (anterior portion), ventral. BG—Bennett’s gland, CD—copulatory duct, SS—stalk of spermatheca.