Cybaeus bryoncavus 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 : 455-458

publication ID	https://doi.org/ 10.11646/zootaxa.5026.4.1
publication LSID	lsid:zoobank.org:pub:511C28F6-07E4-412C-B83E-91D2CAC5AA27
persistent identifier	https://treatment.plazi.org/id/EE3CB72D-FF9A-FFA8-BEA9-A3073C8CE4BF
treatment provided by	Plazi
scientific name	Cybaeus bryoncavus Bennett
status	sp. nov.

Treatment

Cybaeus bryoncavus Bennett View in CoL spec. nov.

Figs 5–7 View FIGURES 5–7 , 11–13 View FIGURES 8–13 , 27 View FIGURES 26–28 , 30 View FIGURES 29–31 , 32 View FIGURE 32

Type material. U.S.A.: California: Holotype male. Amador County, Moss Cave, near Volcano , California , 17.x.1987, D. Ubick, ( CAS) . Paratypes. Amador. 4♀, Pine Grove , 7.vii.1958, W.J. Gertsch & V.D. Roth ( AMNH) ; 1♂ 1♀, 0.5 mi. NW of Volcano , 25.iii.1995, D. Ubick ( CAS) .

Etymology. The specific epithet, derived from a combination of the Greek (bryon) and Latin (cavum) nouns for “moss” and “hole” respectively, refers to the type locality for this species.

Diagnosis. The male of C. bryoncavus spec. nov. is unlikely to be confused with the males of C. bilectus spec. nov. or C. wilsonia spec. nov., the other members of the devius species group with known males. The male of C. bryoncavus spec. nov. is diagnosed by the form of the patellar apophysis ( Figs 5 View FIGURES 5–7 , 27 View FIGURES 26–28 ) and the proximal arm of the tegular apophysis ( Figs 6–7 View FIGURES 5–7 , 30 View FIGURES 29–31 ): patellar apophysis moderately long (length about 2/3 the width of the patella), antero-laterally directed, lacking concave areas, and with about 25 to 30 peg setae dorsally along the length of the distal margin; the proximal arm of the tegular apophysis has a small, inconspicuous, posteriorly directed basal projection and an elongate, acuminate, slightly twisted tip.

The female of C. bryoncavus spec. nov. ( Figs 11–13 View FIGURES 8–13 ) is only likely to be confused with the female of C. bilectus spec. nov.; distinguishing the females of these two species is discussed under C. bilectus spec. nov.

Description. Femora unbanded (holotype) or banded (paratypes). Ventral tibia I macrosetae 2-1p-2-1p-0(or 2).

Male: (n=2). Distal arm of tegular apophysis ( Fig. 6 View FIGURES 5–7 ) broad basally, elongate (but length less than twice width), gradually narrowing to tip. Embolus narrow; tip apparently broken off in holotype specimen.

Measurements (n=1). CL 2.7, CW 2.03, SL 1.31, SW 1.29.

Female: (n=5).Atrium ( Figs 11–12 View FIGURES 8–13 ) deep but small, about 1/2 width of vulva.Copulatory ducts and spermathecal ducts ( Figs 12–13 View FIGURES 8–13 ) simple but elongate, convoluted. Copulatory ducts proceed anteriorly along mid-line of vulva then diverge and intertwine with spermathecal stalks.Stalks with one coil looped around medial section of copulatory ducts.

Measurements (n=4). CL 2.30–3.0 (2.5), CW 1.63–2.15 (1.80), SL 1.13–1.40 (1.22), SW 1.09–1.38 (1.18).

Distribution and natural history. ( Fig. 32 View FIGURE 32 ). Known only from the area around the type locality on the western slopes of the central Sierra Nevada. The two males were collected in March and October. The Volcano male and female were found under limestone in an oak forest.