Paracetopsis Bleeker, 1862
Paracetopsis can be distinguished from all other genera in the Cetopsinae by the combination of the possession of a vomerine tooth patch with two or more rows of teeth and a medial gap between the contralateral components of the tooth patch.
KEY TO THE SPECIES OF PARACETOPSIS
|1.||Dorsal profile of body without distinct notch at rear of head in area of contact of posterodorsal portion of externally obvious jaw musculature and anterior portion of epaxial musculature||Paracetopsis esmeraldas|
|Dorsal profile of body with distinct notch at rear of head in area of contact of posterodorsal portion of externally obvious jaw musculature and anterior portion of epaxial musculature|
|2.||Pelvic fin extending posteriorly to completely overlap vent and nearly reaching to anal-fin origin; vomerine teeth with medial gap equivalent to width of 1 or 2 vomerine teeth||Paracetopsis atahualpa|
|Pelvic fin extending posteriorly to barely reach anterior limit of vent and falling distinctly short of anal-fin origin; vomerine tooth row with medial gap equivalent to width of 3 or 4 vomerine teeth||Paracetopsis bleekeri|