Morphology Data of Astyanax vermilion
Identification keys
Main Ref. Zanata, A.M. and P. Camelier, 2009
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs
Different appearance always different morphology between mature adults
Different colors
Remarks Males differ from females by having the following characters: presence of bony hooks on anal fin rays; anal fin border somewhat strainght to slightly concave (vs. concave on anterior half in females); distal portion of first pelvic-fin rays distinctly darker than females; slightly higher body depth; longer pectoral fin and pelvic fin; and shorter anal-fin lobe (Ref. 81202).

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
Type of scales cycloid scales

Diagnosed from all its congeners from northeastern Brazilian drainages by having distal portion of pelvic fins dark, a combination of sexually dimorphic characters, posteroventral portion of body and fins (except pectoral) reddish in life, and inconspicuous humeral and caudal spots. Can be further distinguished by having the following characters: highest body depth just anterior of dorsal-fin origin, scales on lateral line 32-34; five series of scales between dorsal origin and lateral line; three series of scales between lateral line and pelvic-fin origin; anal fin with 20-23 branched rays; dorsal usually ii,8,i; base of anterior anal-fin rays with 8-12 scales; one or two maxillary teeth; presence of no more than 5 cusps and dentary teeth abruptly decreasing in size posteriorly (Ref. 81202).

Description: Dorsal-fin rays ii,8, ii,8,i, or ii,9; anal-fin rays iii,20, 21, 22, or 23; pectoral-fin rays i,9, 10, 11, or 12; pelvic-fin rays i,6 or 7. Scales rows between lateral line and pelvic-fin insertion 3 (Ref. 81202).

Ease of Identification

Meristic characteristics of Astyanax vermilion

Lateral Lines Interrupted: No
Scales on lateral line 32 - 34
Pored lateral line scales 32 - 34
Scales in lateral series
Scale rows above lateral line 5 - 5
Scale rows below lateral line
Scales around caudal peduncle 14 - 14
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb
total 33 - 33


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 23 - 26

Paired fins

Pectoral Attributes  more or less normal
Soft-rays   10 - 13
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.
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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