Updated January 19, 2021
with a revision of the LRT that now nests this taxon between the piranha, Serrasalmus, and Xiphactinus, the giant Cretaceous predator.
The aimara, trahira, gold wolf fish, etc.
(genus: Hoplerythrinus unitaeniatus (hop-ler-rie-thry-nus) ) swims in South American rivers.
(originally Erythrinus unitaeniatus Spix and Agassiz 1829) is the extant gold wolf fish or aimara, found in South American rivers. Like Amia, this taxon does well with stagnant, oxygen-poor water by gulping air.
The clear resemblance of Hoplerythrinus to the bowfin, Amia
(Fig. 5), is due to homology. The two are closely related. Note some bones split. Others appear de novo. Others expand/shrink.
The atypical contact between
the premaxillary ascending processes and the frontals (splitting the nasals, Fig. 2) in Hoplerythrinus recalls a similar morphology in Amia (Fig. 5).
Spix JB von and Agassiz L 1829. Selecta genera et species piscium quos in itinere per Brasiliam annis MDCCCXVII-MDCCCXX jussu et auspiciis Maximiliani Josephi I…. colleget et pingendso curavit Dr J. B. de Spix…. Monachii.