Morphology Data of Psilorhynchus robustus
Identification keys
Main Ref. Conway, K.W. and M. Kottelat, 2007
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 elongated
Cross section
Dorsal head profile
Type of eyes
Type of mouth/snout
Position of mouth sub-terminal/inferior
Type of scales

Psilorhynchus robustus is most similar to P. gracilis and P. balitora in overall body shape, meristics and colour pattern. It is distinguished from both species by the presence of a large dark blotch situated posterodorsally to opercle opening, extending along lateral-line scales 3–6 (vs. absence) and in having upper lip separated from the rostral cap by a shallow groove (vs. upper lip separated from rostral cap by a deep groove).

Ease of Identification

Meristic characteristics of Psilorhynchus robustus

Lateral Lines 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
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb


Dorsal fin(s)

Fins number 1
Finlets No. Dorsal   
Spines total 3
Soft-rays total 9
Adipose fin

Caudal fin


Anal fin(s)

Fins number 1
Spines total 2
Soft-rays total 6

Paired fins

Pectoral Attributes  
Spines     5
Soft-rays   11 - 12
Pelvics Attributes  
Spines     2
Soft-rays   7
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
Entered by Busson, Frédéric
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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