Percichthys laevis (Jenyns, 1840)

Family:  Percichthyidae (Temperate perches)
Max. size:  22 cm SL (male/unsexed)
Environment:  benthopelagic; freshwater
Distribution:  South America: Santa Cruz-Chico systems in Argentina.
Diagnosis:  Anal soft rays: 8-11. Differs from its congeners by the dentigerous arm of premaxilla about 1.6-1.9 the height of ascending process (vs. 1.5 or more than 2 times that height), and the following combination of characters: quadrate-mandibular articulation at posterior half of orbit; mouth hypognathous; posterior border of maxilla at about anterior border of pupil, between the posterior border of lachrymal and anterior half of the infraorbital 2; hyoid artery piercing dorsal hypohyal; 3 predorsal bones; one supernumerary spine on first dorsal pterygiophore; 8 trisegmented pterygiophores in dorsal fin; 3rd or 4th dorsal fin spine the longest; anal fin origin slightly behind the origin of rayed portion of dorsal fin; pectoral and pelvic fins of similar length, being 60-75% HL and 70-110% body depth; 15-16 pectoral fin rays; 8-11 anal fin rays; 45-49 caudal fin rays (Ref. 55324).
IUCN Red List Status: Not Evaluated (N.E.) Ref. (126983)
Threat to humans:  harmless

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