Morphology Data of Astyanax taeniatus
Identification keys
Abnormalities
Main Ref. Silva, P.C., M.C. Malabarba and L.R. Malabarba, 2019
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs no special organs
Different appearance males alike females
Different colors males alike females
Remarks

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 terminal
Type of scales
Diagnosis

Astyanax taeniatus is distinguished from all other species of the Astyanax by the presence of a gap between the symphyseal dentary teeth, with the exception of A. henseli. It differs from A. henseli by having only one humeral spot (vs. two), 19-23 anal-fin rays (vs. 22-27), orbital diameter 38.5-46, mean ¼ 42.2 (vs. 42.4-50.7, mean ¼ 46.7), and 12-13 gill rakers on hypobranchial (vs. 14-15). In addition, Astyanax taeniatus differs from A. henseli and most Astyanax species, except A. ribeirae, A. hastatus, A. giton, and A. bahiensis, by having a humeral spot shaped like a comma. It can be diagnosed from A. ribeirae and A. hastatus by having 38-41 scales on lateral line (vs. 34-36) and from A. giton and A. bahiensis by the format of third infraorbital (with a naked area in relation to preopercle vs. reaching preopercle, without naked area). It can be further diagnosed from morphologically similar species of the genus Astyanax that occur in Atlantic coastal river basins by having 38-41 perforated scales in the lateral line (vs. 34-38 in most of species), except A. aff. fasciatus, A. parahybae, and A. pelecus. It differs from A. aff. fasciatus, A. parahybae and A. scabripinnis by the dentary teeth decreasing abruptly after the fifth or sixth tooth (vs. dentary teeth decreasing abruptly after the fourth tooth). It can be differentiated from A. pelecus by humeral spot surpassing lateral line (vs. humeral spot restrict to the region above lateral line) (Ref. 119398).

Teeth in the lower jaw 14 or more. The ventrals are exactly aligned with the origin of the dorsal fin.

Ease of Identification

Meristic characteristics of Astyanax taeniatus

Lateral Lines Interrupted: No
Scales on lateral line 38 - 41
Pored lateral line scales
Scales in lateral series
Scale rows above lateral line 6 - 7
Scale rows below lateral line
Scales around caudal peduncle 14 - 18
Barbels
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb
total
Vertebrae
preanal 18 - 18
total 37 - 37

Fins

Dorsal fin(s)

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

Caudal fin

Attributes forked

Anal fin(s)

Fins number 1
Spines total 3 - 3
Soft-rays total 21

Paired fins

Pectoral Attributes  more or less normal
Spines     
Soft-rays   12 - 14
Pelvics Attributes  more or less normal
Position    abdominal
Spines     
Soft-rays   8
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
Entered by Binohlan, Crispina B.
Modified by Torres, Armi G.
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