Cybaeus aspenicolens, Chamberlin & Ivie, 1932

Bennett, Robb, Copley, Claudia & Copley, Darren, 2021, Cybaeus (Araneae: Cybaeidae): the aspenicolens species group of the Californian clade, Zootaxa 4926 (2), pp. 224-244: 226

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.4534288

persistent identifier

http://treatment.plazi.org/id/676A6A74-B103-3879-F8A1-F91DFA34F867

treatment provided by

Plazi

scientific name

Cybaeus aspenicolens
status

 

Key to the species of the Cybaeus aspenicolens  group

1. Patellar apophysis broad, blunt; peg setae dimorphic, in two groups ( Figs 2View FIGURES 1–4, 5View FIGURES 5–7, 8View FIGURES 8–10, 11–13View FIGURES 11–13). Proximal arm of tegular apophysis “C”-shaped, tip strongly retrolaterally directed, uncinate ( Figs 3–4View FIGURES 1–4, 6–7View FIGURES 5–7, 9–10View FIGURES 8–10). Atrium in a prominent epigynal concavity; atrial openings not obscured by anterior transverse epigynal ridge or hood ( Figs 14, 16, 18View FIGURES 14–19) ( aspenicolens  subgroup)...... 2

- Patellar apophysis narrower, tapered; peg setae monomorphic, in single group ( Figs 25View FIGURES 25–28, 29View FIGURES 29–31). Proximal arm of tegular apophysis relatively straight, not “C”-shaped, tip prolaterally directed, bifurcate (especially in retrolateral view) ( Figs 26, 28View FIGURES 25–28, 30–33View FIGURES 29–31View FIGURES 32–33). Prominent epigynal concavity lacking; atrial openings at least partially obscured by anterior transverse ridge or hood ( Figs 34–35, 38–39View FIGURES 34–40) ( fraxineus  subgroup)...................................................................... 4

2(1). Proximal arm of tegular apophysis strongly deflected dorsally, mostly hidden in ventral view ( Fig. 9View FIGURES 8–10) and visible only in posterior view ( Fig. 10View FIGURES 8–10). Patellar apophysis with about 30 or 40 conspicuous stout peg setae retrolaterally and approximately two dozen much smaller peg setae dorsally ( Figs 8View FIGURES 8–10, 13View FIGURES 11–13). Anterior transverse ridge bordering epigynal depression absent or only weakly developed ( Fig. 14View FIGURES 14–19). No distinct sclerotized regions on epigynum..................... coylei Bennett  spec. nov.

- Proximal arm of tegular apophysis only slightly deflected dorsally and clearly visible in ventral view ( Figs 3View FIGURES 1–4, 6View FIGURES 5–7). Patellar apophysis with ± two dozen conspicuous peg setae retrolaterally and ±15 small peg setae dorsally ( Figs 2View FIGURES 1–4, 5View FIGURES 5–7, 11, 12View FIGURES 11–13). Anterior transverse epigynal ridge prominent ( Figs 16, 18View FIGURES 14–19). Some degree of sclerotization on epigynum....................... 3

3(2). Patellar apophysis with about two dozen retrolateral peg setae and less than ten (usually four to seven) very small dorsal peg setae in a loose cluster ( Figs 2View FIGURES 1–4, 11View FIGURES 11–13). Tip of proximal arm of tegular apophysis very slightly twisted ( Figs 3–4View FIGURES 1–4). Atrial openings covered by pair of longitudinal flaps ( Fig. 16View FIGURES 14–19). Vulval ducts often broadly contiguous along vulval midline ( Figs 17View FIGURES 14–19, 21View FIGURES 20–24).............................................................................. aspenicolens Chamberlin & Ivie 

- Fifteen to 20 retrolateral peg setae and usually 12 to 15 short, stout dorsal peg setae in a tight cluster ( Figs 5View FIGURES 5–7, 12View FIGURES 11–13). Tip of proximal arm of tegular apophysis strongly twisted ( Figs 6–7View FIGURES 5–7). Atrial openings usually not covered ( Fig. 18View FIGURES 14–19). Vulval ducts usually not contiguous ( Figs 19View FIGURES 14–19, 23–24View FIGURES 20–24).................................................... blasbes Chamberlin & Ivie 

4(1). In ventral view, proximal arm of tegular apophysis distinctly bifurcate, ventral tip of proximal arm prominent with broad rounded surface, dorsal tip angular ( Figs 26–27View FIGURES 25–28, 32View FIGURES 32–33). Vulval ducts contiguous medially from atrium to spermathecal stalks ( Figs 35–37View FIGURES 34–40)....................................................................... fraxineus Bennett  spec. nov.

- In ventral view, proximal arm of tegular apophysis not distinctly bifurcate, with an inconspicuous narrow keel ventrally and a smoothly pointed tip dorsally ( Figs 30View FIGURES 29–31, 33View FIGURES 32–33). Vulval ducts contiguous only along posterior portion of copulatory ducts ( Figs 39–40View FIGURES 34–40)............................................................................ thermydrinos Bennett 

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Cybaeidae

Genus

Cybaeus