Morphology Data of Astyanax yariguies
Identification keys
Abnormalities
Main Ref. Torres-Mejia, M., E. Hernández and V. Senechal, 2012
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs
Different appearance
Different colors
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
Type of scales
Diagnosis

Distinguished from other congeners by having the following characters: predorsal scale series regular with 13 scales; maxilla with six teeth; nine scale rows between dorsal-fin origin and lateral line; and snout length 14.9-25.3 % of head length. Can be separated easily from other characins (except for Astyanacinus orthodus) by its coloration pattern consisting of two humeral spots, midlateral stripe formed by anteriorly oriented chevron bars, and horizontally oriented oval-shaped caudal spot that continues over median caudal rays and never reaches a vertical through the last anal-fin ray base. Differs also from species of Astyanax by the combination of 6 teeth in maxilla, 13 scales in a regular predorsal series, 36-39 lateral line scales, 9 scale rows above and 7 scale rows below the lateral line, ii-iii 28-30 anal fin rays, and a maximum body depth 35.4-43.2% of SL (Ref. 91755).

Description:

Ease of Identification

Meristic characteristics of Astyanax yariguies

Lateral Lines Interrupted: No
Scales on lateral line 36 - 39
Pored lateral line scales
Scales in lateral series
Scale rows above lateral line 9 - 9
Scale rows below lateral line 7 - 7
Scales around caudal peduncle
Barbels
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb
total
Vertebrae
preanal
total 35 - 37

Fins

Dorsal fin(s)

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

Caudal fin

Attributes forked

Anal fin(s)

Fins number
Spines total
Soft-rays total 31 - 33

Paired fins

Pectoral Attributes  more or less normal
Spines     
Soft-rays   13 - 14
Pelvics Attributes  more or less normal
Position    abdominal  before origin of D1
Spines     
Soft-rays   8 - 9
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