Cybaeus aspenicolens Chamberlin & Ivie,

Bennett, Robb, Copley, Claudia & Copley, Darren, 2021, Cybaeus (Araneae: Cybaeidae): the aspenicolens species group of the Californian clade, Zootaxa 4926 (2), pp. 224-244: 228-230

publication ID

https://doi.org/10.11646/zootaxa.4926.2.4

publication LSID

lsid:zoobank.org:pub:FDAE3465-979C-482F-908F-D0CF4A15000E

DOI

http://doi.org/10.5281/zenodo.4534290

persistent identifier

http://treatment.plazi.org/id/676A6A74-B105-387D-F8A1-FDFDFC5EFECA

treatment provided by

Plazi

scientific name

Cybaeus aspenicolens Chamberlin & Ivie
status

 

Cybaeus aspenicolens Chamberlin & Ivie 

Figs 1–4View FIGURES 1–4, 11View FIGURES 11–13, 16–17View FIGURES 14–19, 20–22View FIGURES 20–24, 41View FIGURE 41

Cybaeus aspenicolens Chamberlin & Ivie, 1932: 21  , figs 52–54. Roewer 1954: 89. Bonnet 1956: 1301. Roth & Brown 1986: 3. Copley et al. 2009: 372, fig. 6. World Spider Catalog 2020.

Type material. Holotype male and allotype female. U.S.A.: California: Tuolumne County, Aspen Valley, Yosemite National Park , 11.8.1931, W. Ivie ( AMNH), examined but subsequently lost  . Neotype male here designated from original paratype series. U.S.A.: California: Tuolumne County, Aspen Valley, Yosemite National Park , 11.8.1931, W. Ivie ( AMNH), examined  .

Other material examined. U.S.A.: California: Mariposa. 1♀, Bower Cave , 30.5.1959, “RG” ( AMNH); 1♀, 6 mi. S of Mather, 4.9.1958, V  . D. Roth ( AMNH); 1³, Yosemite National Park, Buck Meadows , 15.9.1959, V  . D. Roth & W.J. Gertsch ( AMNH); 1♀, Yosemite National Park, Lower Falls , 30.10.1981, V  . F. Lee ( CAS); 2♀, Yosemite National Park, Spider Cave, Twilight Room floor, 2.3.2009, J. Krejca, L. McDermid, G. Stock, & R  . Sas ( CAS); 1³ 3♀, Yosemite National Park, Strawberry Creek , 12.9.1959, V  . D. Roth & W.J. Gertsch ( AMNH); 1³ (palpus only), Yosemite National Park, Wawona Camp , 17.9.1941, W. Ivie ( AMNH); Tuolumne. 2³ 8♀, 12 mi. E of Buck Mead- ows, 11.9.1959 (W.J. Gertsch & V  . D. Roth ( AMNH); 4³ 4♀, Yosemite National Park, Aspen Valley, 11.8.1931, W. Ivie ( AMNH); 4³ 8♀, Yosemite National Park , Aspen Valley , 4.9.1958, V  . D. Roth ( AMNH)  .

Diagnosis. Cybaeus aspenicolens  is grouped with C. blasbes  and C. coylei  spec. nov. in the informal aspenicolens  subgroup. Distinguishing the aspenicolens  and fraxineus  subgroups is discussed in the aspenicolens  species group diagnosis. Males of C. aspenicolens  and C. blasbes  are distinguished from males of C. coylei  spec. nov. by the proximal arm of the tegular apophysis being clearly visible in ventral view ( Figs 3View FIGURES 1–4, 6View FIGURES 5–7) and the patellar apophysis with two dozen or fewer large, conspicuous peg setae retrolaterally, 15 or fewer small peg setae dorsally, and retrolateral margin slightly concave distal to retrolateral peg setae group ( Figs 2View FIGURES 1–4, 5View FIGURES 5–7, 11–12View FIGURES 11–13) in C. aspenicolens  and C. blasbes versus  proximal arm deflected dorsally and mostly hidden in ventral view ( Fig. 9View FIGURES 8–10) and the patellar apophysis with 30 or more conspicuous peg setae retrolaterally, about two dozen small peg setae dorsally, and retrolateral margin smoothly rounded distal to retrolateral peg setae group ( Figs 8View FIGURES 8–10, 13View FIGURES 11–13) in C. coylei  spec. nov.

Males of C. aspenicolens  and C. blasbes  are differentiated by the number and morphology of the patellar apophysis peg setae and, less noticeably, by the morphology of the tips of the proximal arm of the tegular apophysis and the patellar apophysis. The patellar apophysis in male C. aspenicolens  has two dozen large retrolateral peg setae and fewer than ten (usually four to seven) very small dorsal peg setae ( Figs 2View FIGURES 1–4, 11View FIGURES 11–13) versus no more than 20 large retrolateral peg setae and usually at least 12 short but stout dorsal peg setae ( Figs 5View FIGURES 5–7, 12View FIGURES 11–13) in C. blasbes  . The tip of the proximal arm of the tegular apophysis is relatively short and only slightly twisted ( Figs 3–4View FIGURES 1–4) in C. aspenicolens versus  somewhat longer and more strongly twisted ( Figs 6–7View FIGURES 5–7) in C. blasbes  . Finally, the tip of the patellar apophysis is relatively short and blunt ( Figs 2View FIGURES 1–4, 11View FIGURES 11–13) in C. aspenicolens versus  blunt but relatively elongated ( Figs 5View FIGURES 5–7, 12View FIGURES 11–13) in C. blasbes  .

Females of C. aspenicolens  and C. blasbes  are characterized by an at least slightly sclerotized epigynum and a pronounced anterior ridge on the epigynal depression ( Figs 16, 18View FIGURES 14–19) versus an unsclerotized epigynum and no anterior ridge in C. coylei  spec. nov. ( Fig. 14View FIGURES 14–19).

Females of C. aspenicolens  can be distinguished from those of C. blasbes  by the presence of a pair of small, sclerotized longitudinal flaps covering the atrial openings ( Fig. 16View FIGURES 14–19) and less reliably by the copulatory ducts frequently broadly joined along midline of vulva ( Figs 17View FIGURES 14–19, 21View FIGURES 20–24) in C. aspenicolens versus  atrial openings sclerotized but exposed and not covered by longitudinal flaps ( Fig. 18View FIGURES 14–19) and vulval ducts usually not joined medially ( Figs 19View FIGURES 14–19, 23–24View FIGURES 20–24) in C. blasbes  .

Description. Ventral macrosetae on tibia I usually 2–1p–2–1p–2.

Male: (n=13). Patellar apophysis ( Figs 1–2View FIGURES 1–4, 12View FIGURES 11–13) large, bluntly rounded, slightly constricted near tip with about two dozen conspicuous, dentiform peg setae retrolaterally and less than ten very small, inconspicuous peg setae dorsally. Retrolateral tibial apophysis with inconspicuous short, broad cuticular spine anterodorsally ( Fig. 2View FIGURES 1–4). Proximal arm of tegular apophysis ( Figs 3–4View FIGURES 1–4) large, broad, C-shaped, and slightly deflected dorsally; tip retrolaterally directed, uncinate, truncate, and slightly dextrally twisted.

Measurements (n=12). CL 2.6–3.4 (3.0±0.3), CW 2.00–2.50 (2.19±0.17), SL 1.28–1.55 (1.39±0.08), SW 1.28– 1.53 (1.36±0.08). Holotype, neotype CL 3.0, 2.8; CW 2.23, 2.03; SL 1.43, 1.35; SW 1.38, 1.30.

Female: (n=24). Epigynal depression broad, strongly bordered anteriorly ( Fig. 16View FIGURES 14–19). Atrial openings covered ventrally by pair of longitudinal, angular, sclerotized flaps. Vulval ducts often contiguous along vulval midline except for small area anteriorly ( Figs 17View FIGURES 14–19, 21View FIGURES 20–24), some specimens have non-contiguous ducts ( Figs 20–22View FIGURES 20–24). (Contiguous ducts may be a characteristic of older specimens (see Bennett 2006)).

Measurements (n=20). CL 2.8–3.5 (3.2±0.2), CW 1.93–2.43 (2.22±0.15), SL 1.33–1.60 (1.47±0.09), SW 1.26– 1.55 (1.41±0.08).

Distribution and natural history. Western slopes of the Sierra Nevada in and around western Yosemite National Park ( Fig 41View FIGURE 41). Type series specimens were collected from small, irregular webs under rotting logs and other objects on a hillside at about 6000’. Males have been collected in September.

AMNH

American Museum of Natural History

V

Royal British Columbia Museum - Herbarium

CAS

California Academy of Sciences

R

Departamento de Geologia, Universidad de Chile

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Cybaeidae

Genus

Cybaeus

Loc

Cybaeus aspenicolens Chamberlin & Ivie

Bennett, Robb, Copley, Claudia & Copley, Darren 2021
2021
Loc

Cybaeus aspenicolens

Copley, C. R. & Bennett, R. & Perlman, S. J. 2009: 372
Roth, V. D. & Brown, W. L. 1986: 3
Bonnet, P. 1956: 1301
Roewer, C. F. 1954: 89
Chamberlin, R. V. & Ivie, W. 1932: 21
1932