Key to the Atlantic Species of Microgobius
From Birdsong 1981

1a. Three pores in preopercle sensory canal; soft dorsal fin with more
than 17 elements; anal fin with more than 18 elements; lateral scale
rows greater than 65 ............................................................................. 2

1b. Two pores in preopercle sensory canal; soft dorsal fin usually with
17 or fewer elements; anal fin with 18 or fewer elements; lateral scale
rows fewer than 65 ..................................................................................3

2a. Soft dorsal-fin elements 20-21; anal fin elements 21 (occasionally 20);
lateral scale rows about 77-90; scales mostly cycloid; females with pale
bar edged in black on body above pectoral fin ................................ signatus

2b. Soft dorsal fin elements 18-19; anal fin elements 19 (occasionally 20);
lateral scale rows about 68-78; scales mostly ctenoid; no dark markings
on body in either sex .................................................................. microlepis

3a. A fleshy median crest present on nape; a prominent dark spot on
body below spinous dorsal fin origin; caudal fin usually greater than
40% of SL ........................................................................................ meeki

3b. Fleshy median crest absent or poorly developed on nape; body with
no dark spot below spinous dorsal origin or with many dark spots;
caudal fin usually less than 40% of SL ...................................................4

4a. Scales mostly ctenoid; about 4 enlarged caninoid teeth in outer row
of each dentary; interorbital width broad (about 4% of SL); a broad
yellow stripe on side with 2 narrow yellow stripes above ..................... carri

4b. Scales mostly cycloid; about 8 enlarged caninoid teeth in outer row
of each dentary; interorbital width narrow (less than 3% of SL); no yellow
stripe on body ............................................................................................... 5

5a. Three pores in lateral cephalic sensory canal; body with numerous
dark blotches; mouth of males greatly enlarged (greater than 15% of SL
in males larger than 25 mm) ................................................................ gulosus

5b. Two pores in lateral cephalic sensory canal; body without dark spots;
mouth of males little enlarged (less than 15% of SL in males) ...... thalassinus

 

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