Morphology Data of Aphyocharax yekwanae
Identification keys
Main Ref. Willink, P.W., B. Chernoff, A. Machado-Allison, F. Provenzano and P. Petry, 2003
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs
Different appearance
Different colors
Remarks Mature males with lateral hooks on almost all rays of anal fin.

Descriptive characteristics of juvenile and adult

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

Body with bright red coloration, from vertical through second to fifth branched anal-fin ray to vertical through apex of fork in caudal fin; adipose and posterior 2/3 of anal fin red. This coloration is believed to be autapomorphic. Distal margin of anal fin clear. Maxillary teeth 11-16; incompletely toothed maxilla (Ref. 49521).

Ease of Identification

Meristic characteristics of Aphyocharax yekwanae

Lateral Lines Interrupted: No
Scales on lateral line 35 - 37
Pored lateral line scales 9 - 11
Scales in lateral series
Scale rows above lateral line
Scale rows below lateral line
Scales around caudal peduncle
Gill clefts (sharks/rays only)
Gill rakers
on lower limb 10 - 12
on upper limb 5 - 8
preanal 18 - 18
total 36 - 37


Dorsal fin(s)

Fins number
Finlets No. Dorsal   
Spines total
Soft-rays total 9 - 9
Adipose fin present

Caudal fin

Attributes forked; more or less normal

Anal fin(s)

Fins number
Spines total
Soft-rays total 15 - 17

Paired fins

Pectoral Attributes  more or less normal
Soft-rays   12 - 12
Pelvics Attributes  more or less normal
Position    abdominal  beneath origin of D1
Soft-rays   7 - 7
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
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