Cybaeus consocius, Chamberlin & Ivie, 1932

Bennett, Robb, Copley, Claudia & Copley, Darren, 2021, Cybaeus (Araneae: Cybaeidae): the consocius species group of the Californian clade, Zootaxa 4965 (3), pp. 401-436 : 403-404

Key to the species of the Cybaeus consocius group

1. Proximal arm of tegular apophysis in ventral view with tip forked ( Fig. 3, 20), bifid ( Figs 11, 21), or a broad trough ( Figs 18, 22); in retrolateral view with smoothly, simply curved dorsal margin ( Figs 4, 12, 19). Proximal loops of copulatory ducts distinctly U-shaped in dorsal view of vulva ( Figs 7, 15, 25)...................................................... 2

- Proximal arm of tegular apophysis in ventral view with tip acuminate and/or spirally twisted ( Figs 28, 35, 44, 55–56, 61, 82) or blunt with long, narrow ventral trough ( Figs 70, 73); in retrolateral view, dorsal margin a simple curve ( Figs 36, 83) or a more complex compound curve ( Figs 29, 45, 62). Proximal loops of copulatory ducts not distinctly U-shaped in dorsal view ( Figs 32, 41, 48, 66, 79)........................................................................................ 4

2(1). Proximal arm of tegular apophysis in ventral view with broad, ventral trough terminating in a small point ( Figs 18, 22). Atrium divided ( Figs 23, 26)............................................................. hummeli Bennett spec. nov.

- Proximal arm of tegular apophysis in ventral view conspicuously forked ( Fig. 3) or with inconspicuously bifid tip ( Fig. 11). Atrium undivided, inverted U-shaped ( Figs 5, 9, 13).......................................................... 3

3(2). Proximal arm of tegular apophysis with inconspicuously bifid tip ( Fig. 11). Atrium convex medially, concave laterally ( Fig. 13). Copulatory ducts attached to anterolateral corners of atrium and extending anteriorly from the atrium a distance equal to about 1/4 to 2/5 the distance from epigastric groove to anterior margin of atrium ( Figs 14–15)......... hesper Chamberlin & Ivie

- Proximal arm of tegular apophysis with right-angled fork ( Fig. 3). Atrium concave ( Figs 5, 9, 16). Copulatory ducts attached to lateral margins of atrium ( Figs 6–8, 17); extending little or no distance anteriorly from atrium… consocius Chamberlin & Ivie

4(1). Patellar apophysis with small dorsobasal prominence bearing several peg setae ( Figs 68–69, 72). Tibia with small ridge dorsomedially above retrolateral tibial apophysis ( Figs 68–69). Medial portion of embolus flattened, ribbon-like ( Figs 70–71). Proximal arm of tegular apophysis blunt with narrow longitudinal trough ventrally ( Figs 70–71, 73). Atrium large, nearly as wide as vulva ( Figs 74, 77). Copulatory ducts broad, prominent; converging from atrium to midline then diverging before turning posteriorly at anterior margin of vulva ( Figs 75–76, 78–79)................................ ubicki Bennett spec. nov.

- Patellar apophysis without dorsobasal prominence ( Figs 27, 34, 43, 60, 81). Tibia without dorso-medial ridge. Embolus “normal” ( Figs 35, 44, 61). Tip of proximal arm of tegular apophysis acuminate ( Figs 35, 44, 61, 63). Atrium large but not nearly as wide as vulva ( Figs 30, 37, 64) or small ( Figs 46–47, 52). Copulatory ducts narrower (or, if broad, then membranous and not prominent); not following trajectory of converging then diverging before turning posteriorly ( Figs 31, 40, 47, 65)......... 5

5(4). Patellar apophysis with two to six peg setae ( Fig. 43). Proximal arm of tegular apophysis with prominent ventral keel and terminating in short, slightly twisted tip ( Figs 44–45, 56). Atrium small, inconspicuous, its width equal to about 1/3 of the width of the vulva ( Figs 46–47, 52)............................................................ penedentatus Bennett

- Patellar apophysis with 13 to 40 peg setae ( Figs 27, 34, 60, 81). Proximal arm of tegular apophysis without ventral keel; tip twisted or not ( Figs 28, 35, 57, 61, 63). Atrium larger, more conspicuous, its width about 1/2 to 2/3 width of the vulva ( Figs 30, 37, 64).............................................................................................. 6

6(5). In retrolateral view, dorsal margin of tegular apophysis a simple curve, lacking a proximal projection ( Figs 36, 83). Copulatory ducts usually only contiguous at atrium ( Figs 38, 40). Femora usually banded..................................... 7

- In retrolateral view, dorsal margin of tegular apophysis a compound curve with a prominent proximally directed projection ( Figs 29, 61–62). Copulatory ducts usually contiguous at atrium and medially ( Figs 31–32, 65–67). Femora usually unbanded ................................................................................................... 8

7(6). About 13 peg setae around tip of short, anteriorly directed patellar apophysis ( Fig. 81). Proximal arm of tegular apophysis with simple moderately corkscrewed tip lacking a dorsal process ( Figs 57, 83). Spermathecal stalks slightly sinuous, describing an obtuse angle of about 120 ⁰ –130 ⁰ near Bennett’s glands ( Fig. 41)................................... vulpinus Bennett

- About 35 peg setae dorsally on long, anterolaterally directed patellar apophysis ( Fig. 34). Proximal arm of tegular apophysis with simple untwisted tip; tip with small, triangular dorsal process ( Figs 35, 58). Spermathecal stalks more strongly sinuous, describing an acute angle of about 55 ⁰ –65 ⁰ near Bennett’s gland ( Fig. 39)...................... pan Bennett spec. nov.

8(6). Patellar apophysis long, about as long as width of patella, with 15–25 peg setae ( Fig. 60). Proximal arm of tegular apophysis with prominent basal projection and strongly twisted tip ( Figs 61–63). Copulatory ducts and spermathecal stalks elongate ( Figs 65–67)..................................................................................... simplex Roth

- Patellar apophysis shorter, length about 2/3 patellar width, with 30–40 peg setae ( Fig. 27). Proximal arm of tegular apophysis with much less prominent basal projection and a weakly twisted tip ( Figs 28–29). Copulatory ducts and spermathecal stalks short ( Figs 31–32)............................................................... opulentus Bennett spec. nov.