Key to the species of Microgobius
by J. Van Tassell
modified from Birdsong 1981

1a Soft dorsal fin elements 16 or fewer (rarely 17); anal fin elements 16 or fewer
(rarely 17); scales mostly cycloid, often caducous; a patch of ctenoid scales
beneath pectoral fin ....................................................................................... 2
1b Soft dorsal fin elements 17 or more (rarely 16); anal fin elements 17 or more
(rarely 16); scales cycloid or ctenoid, not caducous; with or without patch of
ctenoid scales beneath pectoral fin ................................................................... 4
2a Soft dorsal fin elements 15 or fewer; anal fin elements 15 or fewer; anal fin
elements 15 or fewer; lateral scale rows less than 40; epaxial myosepta
darkly pigmented ........................................................................................... erectus
2b Soft dorsal fin elements 16 (rarely 15 or 17); anal fin elements 16 (rarely 17)
lateral scale rows greater than 40; epaxial myosepta unpigmented .................... 3
3a Preopercular sensory canal with three pores; lateral scale rows less than 60;
pectoral rays 22-24; a prominent crest or ovoid-shaped spot on body below
anterior dorsal spines ............................................................................ cyclolepis
3b Preopercular sensory canal with 2 pores; lateral scale rows more than 60;
pectoral rays 20-21; spot on body below anterior dorsal spines faint,
never cresent shaped ...................................................................................... curtus
4a Scales entirely cycloid, no ctenoid patch beneath fin; pectoral fin short,
usually 18-24% of SL; both sexes with low, fleshy nuchal crest ............................ 5
4b Patch of ctenoid scales present beneath pectoral fin; remaning scales cycloid
or ctenoid; pectoral fin long, usually 23-27% of SL; fleshy nuchal crest absent
in one or both sexes (always absent in males) .......................................................... 6
5a Dorsum with about 5 dark dashes along dorsal fin base; diffuse dark spot on
body beneath anterior dorsal spines; about 4 enlarged, caninoid teeth in
outer row of each dentary; soft dorsal fin elements usually 17; anal fin
elements usually 17 .............................................................................. emblematicus
5b Dorsum without dark dashes; a dark bar bordered with yellow on body beneath
anterior dorsal spines in males; an iridescent yellow bar present beneath
pectoral fin of females; about 6-7 enlarged, caninoid teeth in outer row of each
dentary; soft dorsal fin elements usually 18; anal fin elements
usually 18 ................................................................................................... brevispinnis
6a A prominent dark spot or bar present on body below origin of spinous dorsal fin;
soft dorsal fin elements usually 17; anal fin elements usually 17 ......................... 7
6b No dark spot on body below origin of spinous dorsal fin; soft dorsal fin elements
17-18; anal fin elements usually 18 ..........................................................crocatus
7a Each dentary with about 15-20 teeth in outer row; fleshy nuchal crest absent in
both sexes; males with dark bar on body below spinous dorsal fin origin, females
with dark spot ..................................................................................... miraflorensis
7b Each dentary with about 7-9 teeth in outer row; fleshy nuchal crest well
developed in females; both sexes with a diffuse dark spot on body below
origin of spinous dorsal fin ........................................................................ tabogensis

 

 

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