Morphology Data of Astyanax serratus
Identification keys
Main Ref. Garavello, J.C.I. and F.A.A. Sampaio, 2010
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs
Different appearance
Different colors
Remarks Males with anal and pelvic-fin hooks (only 1 male without pelvic-fin hooks); smaller specimens (near 46.4 mm SL) with hooks. Females are usually larger in SL than males; lower jaw slight larger in females; however, maxillary bone, orbital diameter, pectoral-fin, pelvic-fin and anal-fin length are proportionally larger in males.

Descriptive characteristics of juvenile and adult

Striking features
Body shape lateral
Cross section
Dorsal head profile
Type of eyes
Type of mouth/snout
Position of mouth
Type of scales

This species can be distinguished from all its congeners from IguaƧu basin by this set of characters: infraorbital 3 narrow and deep but not in contact with preopercle, leaving a naked area approximately 1/5 of height between border and preopercle; premaxillary external series with 2-5, usually 4 tricuspid teeth; non-symphysial teeth in premaxillary internal series pentacuspid; maxillary with 0-4, usually 2 teeth; humeral spot rounded and dark, frequently with a weak and narrow vertical downward prolongation (Ref. 85756).

Ease of Identification

Meristic characteristics of Astyanax serratus

Lateral Lines Interrupted: No
Scales on lateral line
Pored lateral line scales 36 - 40
Scales in lateral series
Scale rows above lateral line 6 - 7
Scale rows below lateral line 5 - 6
Scales around caudal peduncle 16 - 20
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb


Dorsal fin(s)

Fins number
Finlets No. Dorsal   
Spines total
Soft-rays total 8 - 9
Adipose fin

Caudal fin


Anal fin(s)

Fins number
Spines total
Soft-rays total 16 - 20

Paired fins

Pectoral Attributes  
Soft-rays   11 - 13
Pelvics Attributes  
Soft-rays   6 - 8
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
Entered by Capuli, Estelita Emily
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