Morphology Data of Astyanax joaovitori
Identification keys
Main Ref. Oliveira, C.A.M., C.S. Pavanelli and V.A. Bertaco, 2017
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs
Different appearance
Different colors
Remarks Males have hooks on the anal fin, from the last unbranched ray to the 8th branched ray. Pectoral fin has hooks from 1st to 8th unbranched rays. All specimens with hooks on anal fin also have hooks on pectoral fin.

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 terminal
Type of scales

Astyanax joaovitori is distinguished from its congeners belonging to the A. scabripinnis species complex by the following combination of characters: lateral dark stripe beginning immediately behind the upper margin of the opercle; presence of a single vertical humeral dark blotch; a scattered pattern of dark chromatophores below lateral line, at the abdominal region; anal fin with 15 to 20 branched rays; 33 to 36 perforated scales on lateral line; dentary teeth decreasing abruptly in size from the fourth or fifth tooth onwards; and 13 or 14 scales around caudal peduncle (Ref. 116165).

Ease of Identification

Meristic characteristics of Astyanax joaovitori

Lateral Lines Interrupted: No
Scales on lateral line
Pored lateral line scales 33 - 36
Scales in lateral series
Scale rows above lateral line 5 - 7
Scale rows below lateral line 5 - 6
Scales around caudal peduncle 13 - 14
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb
preanal 16 - 17
total 33 - 34


Dorsal fin(s)

Attributes no striking attributes
Fins number 1
Finlets No. Dorsal   
Spines total
Soft-rays total 10 - 11
Adipose fin present

Caudal fin

Attributes forked

Anal fin(s)

Fins number
Spines total
Soft-rays total 19

Paired fins

Pectoral Attributes  more or less normal
Soft-rays   11 - 14
Pelvics Attributes  more or less normal
Position    abdominal  before origin of D1
Soft-rays   7 - 8
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
Entered by Torres, Armi G.
Comments & Corrections
Sign our Guest Book
Back to Search
cfm script by eagbayani, 17.10.00, php script by rolavides, 13/03/08 ,  last modified by sortiz, 06.27.17