Morphology Data of Astyanax bacalarensis
Identification keys
Main Ref. Schmitter-Soto, J.J., 2017
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs
Different appearance
Different colors

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

Astyanax bacalarensis is distinguished from its congeners in the Yucatan by the following characters: anal fin origin never overlapping last dorsal-fin ray (always overlapping in A. altior); head length 28% SL or less (27% or more in A. altior); predorsal length, mean 50.4% SL (mean 53% or more in A. altior and A. angustifrons); mean distance between origins of pelvic and anal fins, 20.5% SL (vs. mean 19.3% or less); humeral spot rectangular-triangular to oval (P-shaped to indistinct in A. belizianus and A. brevimanus) (Ref. 118583).

Ease of Identification

Meristic characteristics of Astyanax bacalarensis

Lateral Lines Interrupted: No
Scales on lateral line 32 - 38
Pored lateral line scales
Scales in lateral series
Scale rows above lateral line 6.5 - 8
Scale rows below lateral line
Scales around caudal peduncle 14
Gill clefts (sharks/rays only)
Gill rakers
on lower limb 11 - 14
on upper limb
total 32 - 33


Dorsal fin(s)

Attributes no striking attributes
Fins number 1
Finlets No. Dorsal   
Spines total
Soft-rays total 9 - 11
Adipose fin

Caudal fin

Attributes forked

Anal fin(s)

Fins number
Spines total
Soft-rays total 21 - 27

Paired fins

Pectoral Attributes  more or less normal
Soft-rays   10 - 11
Pelvics Attributes  more or less normal
Position    abdominal
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