| 1a |
Scales on body restricted to caudal peduncle; first two
spines of D1 in males generally prolonged; male with a
longitudinal low fleshy "gular ridge" between
mandibles ...................................................................................................
minutillus

|
| 1b |
Scales on body extending at least to below origin of
second dorsal fin; first two dorsal spines not prolonged;
"gular ridge" absent...............................................................
2

|
| 2a |
Scales on body extending forward to at least under origin
of D1; dorsal body scales extending to at least the last
two spines of D1...........................................................3

|
| 2b |
Scales on body reaching, at most, to under spine 2 or
3 of D1; no scales at dorsal midline under D1..........................................................................................................
4

|
| 3a |
Pelvic fin rays reaching anus or slightly
past; maxilla extending to no more than under middle of
pupil; D2 with 10(rarely 11) rays; pectoral 15-17 rays;
8-9 gill rakers on first arch; 24-29 scales in lateral series
; no dark spots on lateral or ventral surface of head..........................................................................................................................
sp. S |
| 3b |
Pelvic fin rays not reaching anus; maxilla extending
to below middle of pupil or beyond; D2 with 11 rays; pectoral
with 20 rays; 11 gill rakers on first arch; 34-35 scales
in lateral series; several dark spots on lateral and ventral
surface of head................................................................................................................
lepidotus

|
| 4a |
D2 with 12 rays; anal 11 rays...................................................................................
tagus |
| 4b |
D2 with 10-11 rays; anal generally 10, rarely
9 or 11................................................
5 |
| 5a |
Body with distinct narrow dark bands; distinct
dark crescent band at base of caudal fin; caudal fin lanceolate;
D2 with generally 10 rays...................................................
6 |
| 5b |
Body mottled and drab or with indistinct wide
bands; no band at base of caudal fin or if present, indistinct
and not crescent shaped; caudal fin rounded or elongate;
D2 with generally 11 rays..............................................................................................................
7 |
| 6a |
Body with 7-8 bands; crescent band at base of caudal
fin narrow, its width equal to or less than eye diameter;
caudal fin with 3-5 thin wavy dark bands .....................
zebra

|
| 6b |
Body with 5-6 bands; crescent band at base
of caudal fin wide, greater than eye diameter; no bands
on caudal fin ......................................................................
cuneata |
| 7a |
Maxilla extending to under posterior margin
of eye; fourth pelvic ray longer than 5th ray; gill rakers
on first arch generally 9-10; pectoral rays 17-18 (rarely
19); caudal fin long..............................................................................................................................sp.
H |
| 7b |
Maxilla extending to under posterior of pupil,
at most; 4th pelvic ray shorter than 5th ray; gill rakers
on first arch 12-13 (rarely 11 or 14); pectoral fin with
19-20 (rarely 17 or 21) rays; caudal fin short .......................................................................
dialepta |