Amblystilbe Fowler, 1940

Amblystilbe Fowler, 1940

Amblystilbe Fowler, 1940:85 (type-species: Amblystilbe howesi Fowler, 1940 by original designation; gender feminine). —Géry, 1977:590 (synonym of Prodontocharax Eigenmann & Pearson, 1924 ). —Böhlke, 1984:48 (synonym of Prodontocharax Eigenmann & Pearson, 1924 ). —Malabarba, 2003:218 (synonym of Prodontocharax Eigenmann & Pearson, 1924 ).

Diagnosis. The inferior mouth, with mouth slit located at horizontal through inferior margin of eye, diagnoses Amblystilbe from other cheirodontine genera (except Prodontocharax ). The premaxilla with 8 to 10 teeth ( vs. 4 to 6); the central cusp is larger than lateral ones vs. similarly sized cusp on all teeth; the posterior edentulous lamina of the maxilla flat and plane ( vs. posterior edentulous lamina of the maxilla medially curved in relation to the anterior toothed portion); the anteriormost portion of dentary at the symphyseal joint very narrow in lateral view, at least seven times narrower than the height of the middle length portion of dentary ( vs. the anteriormost portion of dentary at the symphyseal joint corresponding to nearly three times the height of the middle length portion of dentary); the dentary teeth nearly equal in size, shape and cusp number, forming a continuous series along the dentary ( vs. dentary teeth decreasing in size and tooth cusp number posteriorly, forming an anterior series of large and tricuspidate teeth followed by a second and not aligned series of small conical teeth); the longer anal fin with 19 to 25 branched rays ( vs. short anal fin with 11 to 15 branched rays) diagnoses Amblystilbe from Prodontocharax .