Morphology Data of Trachonurus yiwardaus
Identification keys
Abnormalities
Main Ref. Iwamoto, T. and A. Williams, 1999
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs no special organs
Different appearance
Different colors
Remarks

Descriptive characteristics of juvenile and adult

Striking features long whip-like tail
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 other (see diagnosis)
Position of mouth sub-terminal/inferior
Type of scales ctenoid scales
Diagnosis

Grooved lateral line present; body scales relatively small, lateral line scales over distance equal to predorsal length 39-50, scale rows between pelvic fin base and operculum 11-12, below midbase of first dorsal fin to anal fin 26-30, below origin of second dorsal fin 6-9; scale covering on gular and branchiostegal membranes extensive; teeth in both jaws relatively small, but with a distinctly enlarged outer series on premaxillary and a slightly enlarged inner series on dentary; total gill rakers on inner series of first arch 9-13, on inner and outer series of second arch 9-12. Snout protruding, angular.

Ease of Identification likely to be confused with closely related species.

Meristic characteristics of Trachonurus yiwardaus

Lateral Lines 1 Interrupted: No
Scales on lateral line
Pored lateral line scales
Scales in lateral series
Scale rows above lateral line
Scale rows below lateral line
Scales around caudal peduncle
Barbels
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb
total
Vertebrae
preanal
total

Fins

Dorsal fin(s)

Attributes
Fins number 2
Finlets No. Dorsal   
Ventral  
Spines total 2 - 2
Soft-rays total
Adipose fin absent

Caudal fin

Attributes pointed; confluent

Anal fin(s)

Fins number 1
Spines total
Soft-rays total

Paired fins

Pectoral Attributes  more or less normal
Spines     0
Soft-rays   12 - 18
Pelvics Attributes  more or less normal
Position    thoracic  behind origin of D1
Spines     0
Soft-rays   6 - 7
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