TABLE 1. Comparison among pycnodontids with dermocraneal fenestra (based on Applegate 1992; Poyato-Ariza and Wenz 2002; Machado and Brito 2006). Gray areas show shared characters of FCMP 00/497 and other genera.

 
Potiguara Tepexichthys Ocleodus Oropycnodus Pycnodus
FCMP 00/497
  Body shape
 Rhomboidal - diamond
 Drop-like
  Dorsal profile
 A prominent angle is present
 Slightly curved, convex
  Origin of dorsal fin
 At the apex of dorsal profile
 Behind the apex of dorsal profile
  Size of dorsal ridge scales
 All are similar
 The anterior one is the largest
  Dorsal ridge scales
 12-14?
 17
 12-14
 7-9
 13
  abdominal Scales
?
 Wide and flat
Bar-like
 Wide and flat
  Incisiform teeth in dentary and premaxilla
?
3
2
  Shape of caudal fin
 Straight
 Concave
 Double marginated