Cybaeus irreverens Bennett, 2022

Bennett, Robb, Copley, Claudia & Copley, Darren, 2022, The Californian clade of Cybaeus (Araneae: Cybaeidae) in the Nearctic: the septatus species group and three unplaced species, Zootaxa 5100 (2), pp. 189-223 : 210-217

publication ID	https://doi.org/ 10.11646/zootaxa.5100.2.2
publication LSID	lsid:zoobank.org:pub:1D783E41-8DF8-4D3C-9853-38C41CCEBB30
DOI	https://doi.org/10.5281/zenodo.6313371
persistent identifier	https://treatment.plazi.org/id/39264D0A-FFF1-AD10-FF6F-6442FAACFEE0
treatment provided by	Plazi
scientific name	Cybaeus irreverens Bennett
status	sp. nov.

Treatment

Cybaeus irreverens Bennett View in CoL spec. nov.

Figs 69–71 View FIGURES 67–71 , 78–84 View FIGURES 78–81 View FIGURES 82–84 , 87 View FIGURES 85–87

Type material. U.S.A.: Oregon: Holotype male. Lincoln County, Cape Perpetua, 1 mile up a creek from coast, circa 1 mile south of Yachats , 5.viii.1988, R . G. Bennett ( CAS) . Paratypes. Benton. 3♂, county line, Hwy 20, 7 mi. W of Blodgett, 8.vi.1968, F. Beer ( CAS); 1♂, Mary's Peak , 11.viii.1953, V . D. Roth ( CAS); 1♀, McDonald Forest 2.x.1952, V . D. Roth ( CAS). Lincoln. 1♂, 11 mi. E of Tidewater Store, 8.vi.1968, F. Beer ( CAS) .

Etymology. The specific epithet is from the Latin adjective for "disrespectful" or "irreverent" and refers to the resemblance in retrolateral view of the proximal arm of the tegular apophysis to the contemptuous phallic gesture (or digitus impudicus of ancient Rome) involving the middle finger of one hand ( Figs 70 View FIGURES 67–71 , 81 View FIGURES 78–81 ).

Diagnosis. As with many species of Californian clade Cybaeus , specimens of C. irreverens spec. nov. are pale spiders with unbanded leg segments and a lightly patterned abdomen.

The male of C. irreverens spec. nov. is distinguished from other pale species of Californian clade Cybaeus with unbanded leg segments and a lightly patterned abdomen by a combination of characters of the palpal patella, tibia, and genital bulb. The patellar apophysis ( Figs 69 View FIGURES 67–71 , 78–79 View FIGURES 78–81 ) is bluntly triangular and basally very broad (the base of the apophysis occupies most of the retrolateral surface of the patella) with about 15–30 peg setae on its posterior dorsal surface. The carinate retrolateral tibial apophysis is about as long as the tibia ( Figs 69 View FIGURES 67–71 , 78 View FIGURES 78–81 ). The elongate, slender embolus ( Figs 69 View FIGURES 67–71 , 80 View FIGURES 78–81 ) is smoothly curved. The tegular apophysis ( Figs 69 View FIGURES 67–71 , 80–81 View FIGURES 78–81 ) is slender basally; the distal arm of the tegular apophysis is elongate and narrow (length about twice width), curved in a prolateral direction, and rounded apically; in retrolateral view ( Figs 70 View FIGURES 67–71 , 81 View FIGURES 78–81 ) the proximal arm of the tegular apophysis is slightly enlarged basally and narrows abruptly to a simple, elongate, bluntly pointed, ventroprolaterally directed tip.

The female of C. irreverens spec. nov. is distinguished from other pale species of Californian clade Cybaeus with unbanded leg segments and a lightly patterned abdomen by a combination of characters of the atrium, copulatory ducts, and spermathecal stalks. The atrium is characterized by a single, small, transverse atrial opening located posteriorly on the epigynum ( Figs 82–83 View FIGURES 82–84 ). The elongate copulatory ducts ( Figs 83–84 View FIGURES 82–84 ) are very broad at their connection with the atrial opening but gradually become narrower as they proceed anteriorly, and in close proximity to each other, from the atrial opening to near the anterior end of the vulva where they diverge and turn posteriorly to connect with the spermathecal heads medially in the vulva. The spermathecal stalks ( Figs 83–84 View FIGURES 82–84 ) also are elongate but are of narrow diameter throughout their length; they follow a convoluted path from the spermathecal heads anteriorly to the anterior margin of the vulva then turn posteriorly to connect with the spermathecal bases dorsal to the broad portion of the copulatory ducts.

Description. As in diagnosis. Other descriptive characters are presented here. Three complete pairs of ventral tibia I macrosetae, pattern 2(+1p)–1p–2–1p–2.

Male (n=6). The morphology of the tip of the proximal arm of the tegular apophysis shows some variation: in coastal specimens (e.g., Fig. 80 View FIGURES 78–81 ) the tip is more ventrally directed and straight while in inland specimens (e.g., Fig. 69 View FIGURES 67–71 ) it is more prolaterally directed and slightly curved.

Measurements (n=6). CL 3.0–4.2 (3.7), CW 2.05–2.9 (2.4), SL 1.35–1.88 (1.64), SW 1.25–1.75 (1.51). Holotype smallest specimen.

Female (n=1). Heads of spermathecae ( Fig. 84 View FIGURES 82–84 ) small dorsolateral lobes medially located in the vulva. Bennett’s glands ( Fig. 84 View FIGURES 82–84 ) located at junction of spermathecal stalks with large, rounded spermathecal bases. Short fertilization ducts exit bases near junction with stalks.

Measurements (n=1). CL 2.7, CW 1.68, SL 1.33, SW 1.17.

Note: The sexes of C. irreverens spec. nov. were collected separately. Although the single known female specimen is considerably smaller than the males, the sexes are paired here on the basis of geographic locality and the lack of other species of Cybaeus in the vicinity known from only a single sex.

Distribution and natural history. Central Oregon coast in Benton and Lincoln Counties ( Fig. 87 View FIGURES 85–87 ). Males have been collected in June and August. The holotype was found underneath rotting wood in a spruce forest.