Cybaeus devius, Chamberlin & Ivie, 1942

Bennett, Robb, Copley, Claudia & Copley, Darren, 2021, Cybaeus (Araneae: Cybaeidae) in the Nearctic: the devius and tardatus species groups of the Californian clade, Zootaxa 5026 (4), pp. 451-479 : 453

Key to the species of the Cybaeus devius group

(males of C. devius and C. echo unknown)

1. Males.............................................................................................. 2

- Females............................................................................................. 4

2(1). Distal arm of tegular apophysis narrow basally, length more than twice width ( Fig. 24 ). Embolus slightly ribbon-like, broadened. Vicinity of Kings Canyon National Park ( Tulare County , California)........................ wilsonia Bennett spec. nov.

- Distal arm much broader basally, length less than twice width ( Figs 3 , 6 ). Embolus narrow. Tulare or Amador Counties, California ........................................................................................... 3

3(2). Length of patellar apophysis about 2/3 width of patella, distal edge straight ( Figs 5 , 27 ). Proximal arm of tegular apophysis with small basal projection and simple, acuminate tip ( Figs 6 , 30 ). Central Sierra Nevada (Amador County, California)..................................................................................... bryoncavus Bennett spec. nov .

- Length of patellar apophysis about 1/2 width of patella, distal edge concave ( Figs 1–2 , 26 ). Proximal arm of tegular apophysis lacking a basal projection and with bluntly hooked tip ( Figs 3 , 29 ). Southern Sierra Nevada ( Tulare County , California)................................................................................... bilectus Bennett spec. nov.

4(1). Basal section of copulatory ducts very lightly sclerotized, enveloping heavily sclerotized apical section ( Figs 15–16, 18–19 , 21–22 ). Spermathecal stalks very short.................................................................... 5

- Basal and apical sections of copulatory ducts undifferentiated with similar levels of sclerotization ( Figs 9–10, 12–13 ). Stalks much longer, looped once around copulatory ducts........................................................... 7

5(4). Basal section of copulatory ducts looped twice around apical section ( Figs 18–19 ). Vicinity of Kings Canyon National Park ( Tulare County , California)........................................................ wilsonia Bennett spec. nov.

- Basal section looped three times around apical section ( Figs 15–16 , 21–22 ). Lake Tahoe area or south central Sierra Nevada, California ........................................................................................... 6

6(5). Basal section of copulatory ducts of greater area than the relatively small spermathecal bases and slightly obscuring the bases in ventral view ( Fig. 15 ). South central Sierra Nevada (Madera County, California)............. devius Chamberlin & Ivie

- Basal sections of copulatory ducts of lesser area than the relatively large bases and not obscuring the bases in ventral view ( Fig. 21 ). Lake Tahoe area (El Dorado County, California)....................................... echo Bennett spec. nov .

7(4). From atrium, copulatory ducts proceed anteriorly along midline of vulva ( Fig. 12 ). Central Sierra Nevada (Amador County, California)................................................................... bryoncavus Bennett spec. nov .

- From atrium copulatory ducts proceed anteriorly across medial sections of copulatory ducts ( Fig. 9 ). Southern Sierra Nevada ( Tulare County , California)........................................................ bilectus Bennett spec. nov.

Figures

FIGURES 23–25. Cybaeus wilsonia spec. nov., holotype male, left palpus. 23 Patella and tibia, dorsal. 24–25 Genital bulb (24 ventral, 25 retrolateral). CY—cymbium, DA—distal arm of tegular apophysis, E—embolus. Unlabelled arrows indicate length and width of DA (Fig. 24) and swollen base of proximal arm of tegular apophysis (Fig. 25).

FIGURES 1–4. Cybaeus bilectus spec. nov., male from Double Bunk Meadows, California, left palpus. 1–2 Patella and tibia (1 retrolateral, 2 dorsal). 3–4 Genital bulb (3 ventral, 4 retrolateral). CY—cymbium, DA—distal arm of tegular apophysis, E— embolus, PA—proximal arm of tegular apophysis, PS—peg setae, PTA—patellar apophysis, RTA—retrolateral tibial apophysis, TG—tegulum.

FIGURES 5–7. Cybaeus bryoncavus spec. nov., holotype male, left palpus. 5 Patella and tibia, dorsal. 6 Genital bulb (embolus tip apparently missing; base of embolus, part of tegulum obscured in specimen, ventral. 7 Tegular apophysis and embolus (part), retrolateral. CY—cymbium, DA—distal arm of tegular apophysis, E—embolus, PA—proximal arm of tegular apophysis, RTA—retrolateral tibial apophysis. Unlabelled arrow indicates basal projection of PA.

FIGURES 26–28. Cybaeus spp. males, left palpus, patellar apophysis, dorsal (26 C. bilectus spec. nov., from Double Bunk Meadows, California, 27 C. bryoncavus spec. nov., holotype, 28 C. wilsonia spec. nov., holotype). Arrows indicate diagnostic characters (26 concave distal margin; 28 concave dorsal surface).

FIGURES 29–31. Cybaeus spp. males, left palpus, proximal arm of tegular apophysis, ventral (29 C. bilectus spec. nov., from Double Bunk Meadows, California, 30 C. bryoncavus spec. nov., holotype, 31 C. wilsonia spec. nov., holotype). Arrows indicate diagnostic characters (29 bluntly hooked tip, 30 inconspicuous basal projection).

FIGURES 14–19. Cybaeus spp., females, copulatory organ (14–16 C. devius, holotype; 17–19 C. wilsonia spec. nov., from Wilsonia, California). 14, 17 Epigynum, ventral. 15–16, 18–19 Vulva (15, 18 ventral, 16, 19 dorsal). BG—Bennett’s gland, HS—head of spermatheca. Unlabelled solid arrows indicate basal lightly sclerotized sections of copulatory ducts which envelop apical more heavily sclerotized sections (indicated by unlabelled dashed arrows).

FIGURES 20–22. Cybaeus echo spec. nov., holotype female, copulatory organ. 20 Epigynum, ventral. 21–22 Vulva (21 ventral, 22 dorsal). Unlabelled solid arrows indicate basal lightly sclerotized sections of copulatory ducts which envelop apical more heavily sclerotized sections (indicated by unlabelled dashed arrows).

FIGURES 8–13. Cybaeus spp., females from California, copulatory organ (8–10 C. bilectus spec. nov., from Double Bunk Meadows; 11–13 C. bryoncavus spec. nov., from Pine Grove). 8, 11 Epigynum, ventral. 9–10, 12–13 Vulva (9, 12 ventral, 10, 13 dorsal). BG—Bennett’s gland, CD—copulatory duct, HS—head of spermatheca, SS—stalk of spermatheca.