Morphology Data of Astyanax jordanensis
Identification keys
Main Ref. Vera Alcaraz, H.S., C.S. Pavanelli and V.A. Bertaco, 2009
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs
Different appearance
Different colors
Remarks Mature males with bony hooks in dorsal, pectoral, pelvic, and anal fins. Mature females with a few small bony hooks on the last unbranched and anterior branched anal- fin rays.

Descriptive characteristics of juvenile and adult

Striking features
Body shape lateral fusiform / normal
Cross section compressed
Dorsal head profile
Type of eyes
Type of mouth/snout
Position of mouth terminal
Type of scales cycloid scales

Distinguished from other congeners by the combination of the following characters: anal fin with 13-17 branched rays; lateral line scales 35-38; one humeral spot; dentary teeth abruptly

decreasing in size after the fifth tooth; orbital diameter 22.6-29.1% of HL; interorbital width 30.6-35.7% of HL; snout length 25.3-29.7% of HL; predorsal scales 12-15; dorsal procurrent rays 10-12; maxillary teeth 1 or 2; and a conspicuous midlateral band from humeral region to caudal peduncle (Ref. 81203).

Description: Dorsal-fin rays i,9, ii,9; anal-fin rays iii,14, iii,15, iii,16), iv,13, iv,14, iv,15, iv,16, iv,17, v,13, v,14, v,15, v,16), v,17; pectoral-fin rays i,9, i,10, i,11, or i,12; pelvic-fin rays i,6 or i,7. Scale series between lateral line and pelvic-fin insertion 5 (Ref. 81203).

Ease of Identification

Meristic characteristics of Astyanax jordanensis

Lateral Lines Interrupted: No
Scales on lateral line 35 - 38
Pored lateral line scales 35 - 38
Scales in lateral series
Scale rows above lateral line 5 - 7
Scale rows below lateral line
Scales around caudal peduncle 13 - 15
Gill clefts (sharks/rays only)
Gill rakers
on lower limb 10 - 11
on upper limb 6 - 6
preanal 17 - 19
total 34 - 37


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

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.
Modified by Reyes, Rodolfo B.
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