Cybaeus fraxineus Bennett,

Bennett, Robb, Copley, Claudia & Copley, Darren, 2021, Cybaeus (Araneae: Cybaeidae): the aspenicolens species group of the Californian clade, Zootaxa 4926 (2), pp. 224-244: 233-237

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.4534296

persistent identifier

http://treatment.plazi.org/id/676A6A74-B108-3876-F8A1-FB14FE32F9D5

treatment provided by

Plazi

scientific name

Cybaeus fraxineus Bennett
status

spec. nov.

Cybaeus fraxineus Bennett  spec. nov.

Figs 25–28View FIGURES 25–28, 32View FIGURES 32–33, 34–37View FIGURES 34–40, 42View FIGURE 42

Type material. Holotype male. U.S.A.: California: Tulare County, Sequoia National Park, seven miles northeast of Ash Mountain Entrance , matured 4.10.1959, W.J. Gertsch & V. D. Roth ( CAS). 

Paratypes. U.S.A.: California: Tulare, 2³ (incompletely moulted to maturity) 1♀, Sequoia National Park , 7 miles NE Ash Mountain Entrance, matured 4.10.1959, W.J. Gertsch & V  . D. Roth ( CAS); 1³ 1♀, Soda Creek, near Nelson Camp , 14.9.1959, W.J. Gertsch & V  . D. Roth ( AMNH); 1³, Sequoia National Park, Ash Mountain, “Pwr. Sta. #3”, 17.2.1985, D.J. Burdick (D. Ubick); 1♀, Sequoia National Park , near Ash Mountain Entrance , 5.7.1956, W.J. Gertsch & V  . D. Roth ( CAS); 1³, Sequoia National Park , 7 mi. NE of Ash Mountain Entrance, matured 25.9.1959, W.J. Gertsch & V  . D. Roth ( CAS); 1³, Sequoia National Park , 7 mi. NE of Ash Mountain En-trance, matured 30.9.1959, W.J. Gertsch & V  . D. Roth ( CAS); 1♀, Sequoia National Park, 7 mi. NE of Ash Moun-tain Entrance , matured 15.10.1959, W.J. Gertsch & V  . D. Roth ( CAS); 1♀, Sequoia National Park, Clough Cave, 50–100’ from cave entrance, 5.4.1990, Tyson, Brigman & Jeffery ( CAS); 1♀, Sequoia National Park , Clough Cave , 27.4.2004, J. Krejca, P. Sprouse, S. Fryer, P. Paquin, & D. Ubick ( CAS); 1♀, Sequoia National Park , Kaweah Cave , 17.11.2003, V  . Krejca & S. Taylor ( CAS); 1♀, Sequoia National Park, Kaweah Cave , 13.8.2003, V  . Krejca & V  . Loftin ( CAS); 1³, Sequoia National Park, Overhang Cave , 16.9.2003, V  . Krejca & V  . Loftin ( CAS); 3♀, Sequoia National Park, Overhang Cave, outside cave, 29.4.2004, D. Ubick & P. Paquin ( CAS); 2♀, Sequoia National Park , Paradise Cave , 30.4.2004, V  . Krejca, P. Paquin, & D. Ubick ( CAS); 1³, Sequoia National Park, South Fork Ranger Station , 4.11.2004, D. Ubick ( CAS)  .

Etymology. The specific epithet is from the Latin adjective “fraxineus, -a, -um” for “of ash” and refers to the type locality; adjective.

Diagnosis. Cybaeus fraxineus  spec. nov. is grouped with C. thermydrinos  in the informal fraxineus  subgroup. Distinguishing the aspenicolens  and fraxineus  subgroups is discussed in the aspenicolens  species group diagnosis. The males of C. fraxineus  spec. nov. and C. thermydrinos  can be separated by the form of the proximal arm of the tegular apophysis. In males of C. fraxineus  spec. nov. the proximal arm in ventral view ( Figs 26View FIGURES 25–28, 32View FIGURES 32–33) is comprised of two distinct components: the ventral component is a simple, broad, convex arch tapering to a dull or rounded point while the dorsal component is smaller with an angular tip of slightly variable morphology. In ventral view the proximal arm of the tegular apophysis in males of C. thermydrinos  is a single concave process ( Figs 30View FIGURES 29–31, 33View FIGURES 32–33), keeled ventrally and with a simple pointed dorsal tip. The females of C. fraxineus  spec. nov. and C thermydrinos  are dif-ficult to separate. In C. fraxineus  spec. nov. the copulatory ducts, spermathecal heads, and spermathecal stalks ( Figs 35–37View FIGURES 34–40) are broadly contiguous along the midline of the vulva versus in C thermydrinos  the anterior portions of the copulatory ducts as well as the spermathecal heads and stalks are separated and only the posterior portions of the copulatory ducts are contiguous ( Figs 39–40View FIGURES 34–40).

Description. All Gertsch and Roth paratypes (5 males, 4 females) are teneral, incompletely moulted, or in poor condition. Ventral tibia I macrosetae 2–1p–2–1p– 1p.

Male: (n=7). Patellar apophysis ( Fig. 25View FIGURES 25–28) gradually tapering to dull point with 30–40 large peg setae along dorsal and lateral margins of distinct concavity on anterior margin of apophysis. Proximal arm of tegular apophysis (Figs 266–28, 32) prolaterally directed, bifurcate; ventral component large, broad, convex, tapering to dull or rounded point; dorsal component smaller with angular apex; proximal margin of proximal arm smoothly curved in retrolateral view.

Measurements (n=5). CL 2.7–3.6 (3.2), CW 2.00–2.7 (2.4), SL 1.33–1.63 (1.48), SW 1.30–1.55 (1.43). Holotype CL 3.3, CW 2.43, SL 1.48, SW 1.43).

Female: (n=5). Atrium ( Fig. 34View FIGURES 34–40) partially obscured anteriorly by large but inconspicuous, transverse epigynal ridge. Copulatory ducts (figs 35–37) heavily sclerotized.

Measurements (n=2). CL 2.6, 2.8; CW 1.78, 1.90; SL 1.26, 1.30; SW 1.20, 1.23.

Distribution. Western slopes of the southern Sierra Nevada in and around Sequoia National Park, Tulare County, California ( Fig. 42View FIGURE 42).

V

Royal British Columbia Museum - Herbarium

CAS

California Academy of Sciences

AMNH

American Museum of Natural History

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Cybaeidae

Genus

Cybaeus