Morphology Data of Thryssocypris tonlesapensis
Identification keys
Abnormalities
Main Ref. Roberts, T.R. and M. Kottelat, 1984
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs
Different appearance
Different colors
Remarks

Descriptive characteristics of juvenile and adult

Striking features
Body shape lateral elongated
Cross section
Dorsal head profile
Type of eyes
Type of mouth/snout
Position of mouth
Type of scales
Diagnosis

Immediately distinguished from T. smaragdinus by its much smaller head, more numerous scales (44-46 in lateral line series versus 36-39), and more numerous anal fin rays (151/2 - 161/2 versus 121/2 - 141/2). The very striking difference in size of the pharyngeal jaws of tonlesapensis, the linear dimensions of which are only about half as great as in T. smaragdinus, is much greater than would be expected if this difference were due only to the difference in head size, since the head is only about 20% longer in T. smaragdinus. Gill rakers on first gill arch 8.

Ease of Identification

Meristic characteristics of Thryssocypris tonlesapensis

Lateral Lines Interrupted: No
Scales on lateral line
Pored lateral line scales
Scales in lateral series 44 - 46
Scale rows above lateral line 6 - 6
Scale rows below lateral line 3 - 3
Scales around caudal peduncle 16 - 17
Barbels
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb
total 8 - 8
Vertebrae
preanal
total 43 - 44

Fins

Dorsal fin(s)

Attributes
Fins number 1
Finlets No. Dorsal   
Ventral  
Spines total
Soft-rays total 9 - 10
Adipose fin absent

Caudal fin

Attributes forked; more or less normal

Anal fin(s)

Fins number
Spines total
Soft-rays total 15 - 16

Paired fins

Pectoral Attributes  more or less normal
Spines     
Soft-rays   10 - 12
Pelvics Attributes  more or less normal
Position    abdominal  before origin of D1
Spines     
Soft-rays   7 - 8
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
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