Astyanax dissensus Lucena & Thofehrn, 2013
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Family:  Characidae (Characins), subfamily: Stethaprioninae
Max. size:  8.42 cm SL (male/unsexed)
Environment:  benthopelagic
Distribution:  South America: Laguna dos Patos system and rio Uruguay drainage; one specimen from coastal lagoon of rio Tramanda√≠ system.
Diagnosis:  Dorsal soft rays (total): 10-11; Anal soft rays: 27-33; Vertebrae: 35-36. This species can be diagnosed from all congeners in the rio Uruguay basin, laguna dos Patos and rio Tramanda√≠ systems, except Astyanax ojiara, by the presence of one heptacuspid tooth on maxillary (vs. tri- to pentacuspid teeth). It differs from other congeners, including species complex A. bimaculatus and A. scabripinnis by the following combination of characters: two humeral spots, the first spot vertically elongate; conspicuous caudal spot; 35-39 perforated lateral line scales; 6-7 scale rows between dorsal-fin origin and lateral line; 22-28 branched anal-fin rays; predorsal region scaled; one heptacuspid maxillary tooth; body depth 37.2-44.2% of SL; and head length 22.7-27.3% of SL). It is distinguished from A. ojiara by the head length 22.7- 27.3% (vs. 27.3-29.5% of SL) and by the presence of hooks on anal fin on males (vs. all fins with hooks) (Ref. 94153).
Biology: 
IUCN Red List Status: Not Evaluated (N.E.) Ref. (123251)
Threat to humans:  harmless
Country info:   
 

Entered by: Torres, Armi G. - 19.12.13

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