Cybaeus grizzlyi Schenkel 1950,

Bennett, Robb, Copley, Claudia & Copley, Darren, 2019, Cybaeus (Araneae: Cybaeidae): the adenes species group of the Californian clade, Zootaxa 4711 (2), pp. 245-274: 256

publication ID

https://doi.org/10.11646/zootaxa.4711.2.2

publication LSID

lsid:zoobank.org:pub:06B09245-2722-4F4D-9076-41E68A17E8A7

persistent identifier

http://treatment.plazi.org/id/2F5B4D33-7074-FFA8-B289-41D7FB80F97B

treatment provided by

Plazi

scientific name

Cybaeus grizzlyi Schenkel 1950
status

 

Cybaeus grizzlyi Schenkel 1950 

Figs 25–32View FIGURES 25–27View FIGURES 28–30View FIGURES 31–32, 61–62View FIGURES 61–64, 69View FIGURE 69

Cybaeus adenes Chamberlin & Ivie 1932: 24  (in part, paratypes only). Roth 1956: 178. Roth & Brown 1986: 3

Cybaeus grizzlyi Schenkel 1950: 86  , fig. 32. Roewer 1954:90. Bennett 1992: 4, Figs 1–2View FIGURES 1–3. Bennett 2006: 485, Figs 40–43View FIGURES 38–43. World Spider Catalog 2019.

Cybaeus adenoides Schenkel 1950: 88  , fig. 33. Roewer 1954: 89.

Type material. Holotype ♂ of C. grizzlyi  . U.S.A.: California: Alameda County, Grizzly Peak, near Berkeley , 5 November 1938, no collector data ( NHMB), examined  . Lectotype ♀ of C. adenoides  . U.S.A.: California: Alameda County, Berkeley Hills , 23 April 1939, no collector data ( NHMB), examined. See discussion of type material and synonymy in Bennett (2006)  .

Other material examined. Specimens and locality data in Bennett (2006). Note: Castro Valley females number only 4 (not 43 as listed in Bennett 2006).

Diagnosis. The male of C. grizzlyi  is diagnosed by the morphology of the proximal arm of the tegular apophysis which is deeply grooved ventrally with a single, blade-like tip and a prominent pointed keel dorsally ( Figs 25View FIGURES 25–27, 61–62View FIGURES 61–64). The keel is absent in the known males of the other adenes  group species with a single tip of the proximal arm ( C. amicus  : Fig. 56View FIGURES 56–60) or is a broad blunt protuberance ( C. auburn  : Figs 63–64View FIGURES 61–64) and in males of other species with a similar bluntly pointed dorsal keel, the tip of the proximal arm is bifid ( C. adenes  : Figs 59–60View FIGURES 56–60; C. sanbruno  : Fig. 67View FIGURES 65–68; C. schusteri  : Fig. 65View FIGURES 65–68) or trifid ( C. reducens  : Fig. 57View FIGURES 56–60).

The inverted U-shaped or lyriform atrium, widest anteriorly ( Fig. 30View FIGURES 28–30), distinguishes the female of C. grizzlyi  from females of all other adenes  group species except C. adenes  (and occasionally C. schusteri  ). From females of C. adenes  this species can evidently only be separated on the basis of locality. Collection of males with females may be the only way to ensure reliable separation of females of C. grizzlyi  and C. schusteri  with similar atrial morphology. See diagnosis of C. adenes  for further discussion.

Description. Femora unbanded.

Male: (n=24). Patellar apophysis ( Fig. 26View FIGURES 25–27) with about 30 peg setae along anterodorsal surface. Small retrolateral ridge anteriorly on tibia dorsal to carina ( Figs 26–27View FIGURES 25–27).

(n=16). CL 2.15–2.9 (2.6±0.2), CW 1.63–2.13 (1.90±0.14), SL 1.11–1.45 (1.29±0.09), SW 1.05–1.35 (1.21±0.09). Holotype CL 2.50, CW 1.83, SL 1.36, SW 1.14.

Female: (n=76). ( Figs 28–32View FIGURES 28–30View FIGURES 31–32). Description as for C. adenes  .

(n=23). CL 2.00–3.0 (2.4±0.3), CW 1.16–2.05 (1.65±0.24), SL 0.99–1.43 (1.21±0.13), SW 0.93–1.33 (1.13±0.13). Holotype of C. adenoides  CL 2.6, CW 1.85, SL 1.30, SW 1.25.

Distribution and natural history. Known only from Contra Costa and Alameda Counties in west central California ( Fig. 69View FIGURE 69) where it is apparently relatively common. At the University of California (Berkeley) campus this species has been collected under logs in eucalyptus groves. Elsewhere it has been found under bark. Males have been collected from mid–October to late December with one record from late April.

NHMB

Natural History Museum Bucharest

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Cybaeidae

Genus

Cybaeus

Loc

Cybaeus grizzlyi Schenkel 1950

Bennett, Robb, Copley, Claudia & Copley, Darren 2019
2019
Loc

Cybaeus grizzlyi

Bennett, R. G. 2006: 485
Bennett, R. G. 1992: 4
Schenkel, E. 1950: 86
1950
Loc

Cybaeus adenoides

Roewer, C. F. 1954: 89
Schenkel, E. 1950: 88
1950
Loc

Cybaeus adenes

Roth, V. D. & Brown, W. L. 1986: 3
Roth, V. D. 1956: 178
Chamberlin, R. V. & Ivie, W. 1932: 24
1932