· Heterocercal = asymmetry of the caudal fin (same as melanocercus = black or dark coloured tail)
· Heterothermic = greek word that indicates organisms that their body temperature depends on the ambient temperature ...
Acipenseriformes: Caudal fin heterocercal; myodome and preopercle reduced or absent; gulars absent; skeleton largely cartilaginous; fin rays more numerous than their basals; intestine with spiral valve.
See Fishbase.
Families in this order: ...
 See also: Pelvic fin, Pectoral fin, Dorsal, Caudal peduncle, Water
  
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