Morphology Data of Opsarius signicaudus
Identification keys
Main Ref. Tejavej, A., 2012
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs
Different appearance
Different colors

Descriptive characteristics of juvenile and adult

Striking features
Body shape lateral fusiform / normal
Cross section
Dorsal head profile
Type of eyes
Type of mouth/snout
Position of mouth terminal
Type of scales

Distinguished from all congeners by the combination of the following characters: caudal fin- base with a large, elongated blotch (formed by the fusion of the large caudal spot at the fleshy end of the caudal base and the last vertical bar on the flank) that extends about 1/3 of the distance from the caudal-fin origin beyond the last scale on the caudal base to the margin of the caudal fork; anal-fin origin opposing the 2nd-4th branched dorsal-fin rays; eight scale rows above the lateral line; 36 or more precaudal lateral-line scales; dorsal fin with dark pigment concentrated mainly along the margins of the rays; small dentary tubercles; and, if present, a short, small pair of rostral barbels (Ref. 93076).

Ease of Identification

Meristic characteristics of Opsarius signicaudus

Lateral Lines Interrupted: No
Scales on lateral line 36 - 39
Pored lateral line scales
Scales in lateral series
Scale rows above lateral line 8 - 8
Scale rows below lateral line 2 - 3.5
Scales around caudal peduncle 10 - 14
Barbels 4
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb


Dorsal fin(s)

Attributes no striking attributes
Fins number 1
Finlets No. Dorsal   
Spines total
Soft-rays total
Adipose fin absent

Caudal fin

Attributes forked

Anal fin(s)

Fins number
Spines total
Soft-rays total

Paired fins

Pectoral Attributes  more or less normal
Soft-rays   12 - 13
Pelvics Attributes  more or less normal
Position    abdominal  before origin of D1
Soft-rays   7 - 9
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
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