Eurycheilichthys Reis & Schaefer, 1993

Reis, Roberto E., 2017, Unexpectedly high diversity in a small basin: A taxonomic revision of Eurycheilichthys (Siluriformes: Loricariidae), with descriptions of seven new species, Neotropical Ichthyology 15 (1), No. e 160068, pp. 1-28 : 4

Eurycheilichthys Reis & Schaefer, 1993

Eurycheilus Reis & Schaefer, 1992: 216 . Type species: Eurycheilus pantherinus Reis & Schaefer, 1992 . Type by monotypy. Gender: masculine. Preoccupied by Eurycheilus Septfontaine, 1970 , in fossil cephalopods.

Type species. Eurycheilichthys pantherinus ( Reis & Schaefer, 1992) , by original designation.

Diagnosis. Eurycheilichthys is diagnosed within the Hypoptopomatinae by the uniquely derived presence of seven branched pectoral-fin rays ( vs. five or six rays). It is also diagnosed by the possession of reduced filamentous gill rakers on the oral surfaces of the hyobranchial skeleton ( vs. filamentous gill rakers large), and the presence of a distinct fleshy flap along the posterodorsal margin of the pectoralfin spine in adult males ( Fig. 1). It is further differentiated from most other hypoptopomatines by the presence of unicuspid accessory teeth on both the premaxilla and dentary (shared with Epactionotus , a few Parotocinclus species , Niobichthys ferrarisi , and Rhinolekos schaeferi ), and the possession of a greatly expanded lower lip, which extends close to or beyond the anterior margin of the pectoral girdle.