Morphology Data of Betta raja
Identification keys
Main Ref. Tan, H.H. and P.K.L. Ng, 2005
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
Type of scales

Pelvic fin very long in mature males (15-23 anal fin rays at pelvic fin end, even exceeding anal-fin base in some specimens); anal fin and lower half of caudal fin with dark margins; anal fin rays 25-28 (mode 26); lateral scales 30-32 (mode 31); head length 33.9-37.4% SL; predorsal length 20.0-24.6% SL; preanal length 46.1-52.4% SL; and body length 62.8-70.7% SL (Ref. 56386).

Ease of Identification

Meristic characteristics of Betta raja

Lateral Lines Interrupted: No
Scales on lateral line 30 - 32
Pored lateral line scales
Scales in lateral series
Scale rows above lateral line
Scale rows below lateral line
Scales around caudal peduncle
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb
total 28 - 30


Dorsal fin(s)

Fins number 1
Finlets No. Dorsal   
Spines total 1 - 2
Soft-rays total 7 - 10
Adipose fin absent

Caudal fin

Attributes pointed

Anal fin(s)

Fins number
Spines total 2 - 2
Soft-rays total 23 - 26

Paired fins

Pectoral Attributes  
Soft-rays   12 - 13
Pelvics Attributes  
Position    before origin of D1
Spines     1
Soft-rays   5 - 5
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
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cfm script by eagbayani, 17.10.00, php script by rolavides, 13/03/08 ,  last modified by sortiz, 06.27.17