Morphology Data of Psilorhynchus brachyrhynchus
Identification keys
Main Ref. Conway, K.W. and R. Britz, 2010
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

Distinguished from other species of the genus by the following combination of characters: short snout (snout length 43-48% HL); principal rays in the upper caudal-fin lobe 10; absence of a dark irregular vertical bar across the distal edge of the caudal fin; absence of a broad swath of melanophores across the anterior half of the dorsal fin; presence of a large dark blotch at the base of each caudal fin lobe; and presence of an irregular vertical bar across the center of the caudal fin. Can be further diagnosed from all congeners by the following combination of characters: 2 branchiostegal rays; ventral surface between paired fins with triangular scale-less patch; presence of a large postepiphysial fontanelle; branched dorsal-fin rays 9; unbranched pectoral-fin rays 5; caudal-fin rays 10+9; lateral-line scales 32-34; lateral sides of body marked with 5-7 indistinct round to squarish dark blotches, arranged in a longitudinal row; caudal fin with a dark, irregular vertical bar across its center (Ref. 85329).

Description: Dorsal- fin rays iii.9; anal-fin rays ii.6; pectoral-fin rays v.9-10; pelvic-fin rays ii.6-7 (Ref. 85329).

Ease of Identification

Meristic characteristics of Psilorhynchus brachyrhynchus

Lateral Lines Interrupted: No
Scales on lateral line 32 - 34
Pored lateral line scales
Scales in lateral series
Scale rows above lateral line
Scale rows below lateral line
Scales around caudal peduncle 10 - 10
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb
preanal 17 - 18
total 35 - 35


Dorsal fin(s)

Attributes no striking attributes
Fins number 1
Finlets No. Dorsal   
Spines total
Soft-rays total 12 - 12
Adipose fin absent

Caudal fin


Anal fin(s)

Fins number
Spines total
Soft-rays total 8 - 8

Paired fins

Pectoral Attributes  more or less normal
Soft-rays   14 - 15
Pelvics Attributes  more or less normal
Position    abdominal  behind origin of D1
Soft-rays   8 - 9
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
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