Morphology Data of Thryssa polybranchialis
Identification keys
Abnormalities
Main Ref. Whitehead, P.J.P., G.J. Nelson and T. Wongratana, 1988
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs no special organs
Different appearance males alike females
Different colors males alike females
Remarks

Descriptive characteristics of juvenile and adult

Striking features none
Body shape lateral elongated
Cross section compressed
Dorsal head profile more or less straight
Type of eyes more or less normal
Type of mouth/snout more or less normal
Position of mouth sub-terminal/inferior
Type of scales cycloid scales
Diagnosis

Belly with 15 to 17 + 9 or 10 = 25 to 27 keeled scutes from isthmus to anus. A distinct hump at nape; tip of snout above upper rim of eye. Maxilla short, not quite or only just reaching to edge of gill cover; first supra-maxilla minute, oval. A dark blotch behind upper part of gill opening.

Ease of Identification

Meristic characteristics of Thryssa polybranchialis

Lateral Lines Interrupted: No
Scales on lateral line 34 - 46
Pored lateral line scales
Scales in lateral series
Scale rows above lateral line 0 - 0
Scale rows below lateral line 0 - 0
Scales around caudal peduncle
Barbels 0
Gill clefts (sharks/rays only)
Gill rakers
on lower limb 25 - 27
on upper limb
total
Vertebrae
preanal
total

Fins

Dorsal fin(s)

Attributes no striking attributes
Fins number 1
Finlets No. Dorsal   0 - 0
Ventral  0 - 0
Spines total 0 - 0
Soft-rays total
Adipose fin absent

Caudal fin

Attributes forked; more or less normal

Anal fin(s)

Fins number 1
Spines total 0 - 0
Soft-rays total 35 - 39

Paired fins

Pectoral Attributes  more or less normal
Spines     0
Soft-rays   
Pelvics Attributes  more or less normal
Position    abdominal  before origin of D1
Spines     0
Soft-rays   7 - 7
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
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