Morphology Data of Astyanax guaricana
Identification keys
Main Ref.
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs
Different appearance
Different colors males alike females
Remarks Only males with hooks on the anal fin, from the last unbranched ray until the 10th branched.

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 cycloid scales

This species belongs to the Astyanax scabripinnis species complex sensu. It is distinguished from congeners of the A. scabripinnis species complex, except A. intermedius, A. laticeps, A. paranae and A. varzeae by having 40-43 teral line scales, (vs. less than 39 scales in A. brachypterygium, A. burgerai, A. courensis, A. cremnobates, A. epiagos, A. goyanensis, A. ita, A. jacobinae, A. jenynsii, A. jordanensis, A. leonidas, A. microschemos, A. obscurus, A. ojiara, A. paris, A. pirapuan, A. rivularis, A. scabripinnis, A. totae, and A. troya). Only A. obscurus and A. ojiara have a maximum of 39 lateral line scales. A. guaricana can be separated from A. ojiara, by having 15-17 circumpeduncular scales (vs. 13-14 scales) and A. obscurus, by having 9-15 scales covering base of anal fin (vs. 6-9 scales). It differs from A. intermedius, A. laticeps and A. paranae by the presence of two vertical humeral spots (vs. a single humeral spot in A. paranae and A. intermedius, which is horizontally oval with narrow and vertical anterior extension in A. laticeps); from A. varzeae by the presence of hooks on the anal fin in males (vs. hooks absent), by a shorter prepectoral distance 23.7-26.5% SL (vs. 26.5-32.0% SL), shorter head length 23.9-26.6% SL (vs. 27.1-29.7% SL), and longer snout length 23.3-27.9% head length (vs. 16.4-23.3% head length); and from A. ribeirae by having two humeral spot (vs. one) and 40-43 lateral line scales (vs. 34-38 lateral line scales) (Ref. 93808).

Ease of Identification

Meristic characteristics of Astyanax guaricana

Lateral Lines Interrupted: No
Scales on lateral line
Pored lateral line scales 40 - 43
Scales in lateral series
Scale rows above lateral line 6 - 8
Scale rows below lateral line 5 - 6
Scales around caudal peduncle 15 - 17
Gill clefts (sharks/rays only)
Gill rakers
on lower limb 10 - 12
on upper limb 6 - 8
preanal 18 - 18
total 39 - 40


Dorsal fin(s)

Attributes no striking attributes
Fins number
Finlets No. Dorsal   
Spines total
Soft-rays total 9 - 10
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   9 - 13
Pelvics Attributes  more or less normal
Position    abdominal  behind origin of D1
Soft-rays   8 - 9
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