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

Distinguished from all its congeners by its unique caudal-fin pigmentation pattern, consisting of an approximately symmetrical pattern of small black blotches on both upper and lower caudal-fin lobes. Can be further diagnosed from other species of Psilorhynchus by the combination of the following characters: snout length 53-55% HL; ventral surface between paired fins with a broad rectangular scale-less patch; dorsal fin with 9 branched rays; pectoral fin with 5 unbranched rays; caudal fin with 9+9 rays; scales on lateral line 32-33; lateral sides of body marked with 6 indistinct round to squarish dark-brown blotches, arranged in a longitudinal row; dorsal saddles deep, extending 3-4 scale rows downwards from the dorsal surface, in contact with the round to squarish dark brown blotches, arranged in a longitudinal row on flank (Ref. 85329).

Description: Dorsal-fin rays iii.9; anal-fin rays ii.6; pectoral-fin rays v.11; pelvic-fin rays ii.7 (Ref. 85329).

Ease of Identification

Meristic characteristics of Psilorhynchus piperatus

Lateral Lines Interrupted: No
Scales on lateral line 32 - 33
Pored lateral line scales
Scales in lateral series
Scale rows above lateral line
Scale rows below lateral line
Scales around caudal peduncle 10 - 10
Barbels
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb
total
Vertebrae
preanal
total 35 - 35

Fins

Dorsal fin(s)

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

Caudal fin

Attributes forked

Anal fin(s)

Fins number
Spines total
Soft-rays total 8 - 8

Paired fins

Pectoral Attributes  more or less normal
Spines     
Soft-rays   16 - 16
Pelvics Attributes  more or less normal
Position    abdominal  behind origin of D1
Spines     
Soft-rays   9 - 9
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
Entered by Torres, Armi G.
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