Key to the east Pacific species of Bathygobius
by J. Van Tassell
Modified from Miller & Stefanni (2002)

1a First, and generally the remaining, free pectoral rays branched at least twice (fig A); first dorsal fin distinctly pigmented to distal edge (fig B); pelvic disk generally rounded (occasionally attenuate) , with large lateral lobes(fig C), and disk extending 2/3 - 4/5 distance to anus; postocular blotches large (fig D)....................................... ramosus
A
B
C

D
1b First free pectoral rays bifid (fig A); first dorsal fin not pigmented to distal edge (fig B); pelvic disk generally elliptical, sometimes circular, lateral lobes not attenuate(fig C)and disc extending at least 4/5 distance to anus............................................................ 2
A
B
C
2a First dorsal fin with an oblique dark band, darkest at the upper anterior and lower posterior region of the fin (fig A); pelvic disk not reaching the anus; anterior and posteriomost dorsal blotches about equal in size (fig B)............................... andrei
A
B
2b First dorsal fin with horizontal markings and distal portion of fin with transparent edge (fig A); pelvic disk generally extending to anus and possessing small lateral lobes on frenum; posterior-most dorsal blotches larger than anterior...................... lineatus
A B
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