Cybaeus schusteri Bennett, 2019

Bennett, Robb, Copley, Claudia & Copley, Darren, 2019, Cybaeus (Araneae: Cybaeidae): the adenes species group of the Californian clade, Zootaxa 4711 (2), pp. 245-274 : 264-265

publication ID

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

publication LSID

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

DOI

https://doi.org/10.5281/zenodo.5944505

persistent identifier

https://treatment.plazi.org/id/F6202661-C9BF-42C2-BE98-2EA7D4594049

taxon LSID

lsid:zoobank.org:act:F6202661-C9BF-42C2-BE98-2EA7D4594049

treatment provided by

Plazi

scientific name

Cybaeus schusteri Bennett
status

sp. nov.

Cybaeus schusteri Bennett View in CoL spec. nov.

Figs 50–53 View FIGURES 50–53 , 65–66 View FIGURES 65–68 , 70 View FIGURE 70

Type material. Holotype ♂. U.S.A.: California: Napa County, 10 miles south of Monticello , 6 January 1957, R. O. Schuster ( AMNH).

Paratypes. U.S.A.: California: Napa. 1♀, 5 mi. S of Monticello , 6.i.1957, R . O. Schuster ( AMNH); 2♀, 10 mi. S of Monticello , 16.iii.1956, R . O. Schuster ( AMNH); 1♀, 10 mi. S of Monticello , 17.ii.1957, R . O. Schuster ( AMNH) .

Etymology. The specific name is a patronym honouring the late R.O. Schuster who collected the holotype and paratypes of this species.

Diagnosis. The male of C. schusteri is diagnosed by the combination of about ten small peg setae arranged linearly along the dorsal surface and tip of the patellar apophysis ( Fig. 51 View FIGURES 50–53 ) and, on the proximal arm of the tegular apophysis ( Figs 50 View FIGURES 50–53 , 65–66 View FIGURES 65–68 ), the bifid tip with the terminations small, not pincer-like, and only slightly convergent and the presence of a small but prominent angular dorsal keel. Although no other male of the adenes group has this combination of characters, the males of C. schusteri and C. sanbruno can be confused; see the diagnosis of C. sanbruno for further discussion.

The female is distinguished by the inverted vase-shaped atrium which is narrowest anteriorly and widest posteriorly ( Fig. 53 View FIGURES 50–53 ). It may be difficult to differentiate some females of this species from females of C. adenes and C. grizzlyi . See the diagnosis of C. adenes for further discussion.

Description. Femora unbanded.

Male: (n=1). Small inconspicuous retrolateral ridge anteriorly on tibia dorsal to carinate retrolateral tibial apophysis ( Fig. 51 View FIGURES 50–53 ).

Holotype. CL 1.73, CW 1.30, SL 0.94, SW 0.86.

Female. (n=4). Length of atrium (from epigastric groove to anterior margin) about twice width (between lateral margins) ( Fig. 53 View FIGURES 50–53 ). Vulva ( Fig. 53 View FIGURES 50–53 ) as for C. adenes .

CL 1.75–2.10 (1.94), CW 1.26–1.45 (1.35), SL 0.94– 1.09 (1.02), SW 0.85–0.99 (0.93).

Note. The female of C. adenes from near St. Helena, Napa County ( Figs 9–11 View FIGURES 9–11 ), may prove to be a specimen of C. schusteri . Males and a larger sample of females from that area are needed to determine if one or both of C. adenes and C. schusteri occur in the St. Helena area.

Distribution. Monticello area near south end of Lake Berryessa, Napa County, in west central California ( Fig. 70 View FIGURE 70 ).

R

Departamento de Geologia, Universidad de Chile

AMNH

American Museum of Natural History

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Cybaeidae

Genus

Cybaeus

GBIF Dataset (for parent article) Darwin Core Archive (for parent article) View in SIBiLS Plain XML RDF