Key to the Pacific Species of Microgobius
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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