xrtg said:
this is something new.
thanks.
No, it is something old. The subfamily Herotidinae was recently upgraded to full family status, now called Arapaimatidae. Thus, the breakdown of the two families is as follows:
Family Arapaimatidae includes two genera: Arapaima and Heterotis.
Genus Arapaima includes a single species, Arapaima gigas
Genus Heterotis includes a single species, Heterotis niloticus
Family Osteoglossidae includes two genera: Scleropages and Osteoglossum.
Genus Scleropages includes three species, S. formosus, S. leichardti, and S. jardini.
Genus Osteoglossum includes two species, O. bicirrhosum and O. ferrarai.
The other species listed in the outdated chart are synonyms.