Key to the east Pacific species of Ctenogobius
by J. Van Tassell
links completed

1a Second dorsal fin with 12 (rarely 11 or 13) rays and anal fin with 13 (rarely 12 or 14) rays; predorsal scales generally lacking or if present only 1-5 scales; lateral scale rows 30(28-33); pectoral fins not reaching anus in either sex; 3rd and 4th D1 spines slightly produced in males; maxilla with 3-4 enlarged teeth on each side of outer row; horizontal bar on cheek combining with angular blotch above corner of jaw to form a hatchet like marking on side of head; males with a dark blotch around end of fifth dorsal spine ............................................................................................manglicola
1b Second dorsal fin with 13 (rarely 12, 14, or 15) rays and anal fin with 14 (rarely 13 or 15) rays; 24(0-35) predorsal scales present; lateral scale rows 55-60(49-66); greatly elongate body, with small head and small paired fins not reaching anus in either sex; large dark spot midlaterally on upper jaw ........................................................ sagittula

 

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