The tarpon, Megalops atlanticus Valenciennes, 1847 (Megalopidae), is marine and found at the mouths of rivers and estuaries. Only three species of Elopomorpha are known to occur in the freshwaters of the Neotropical region. As a ribbon and commonly 10 cm long, but reaching up to 2 m, the larva shrinks during metamorphosis into the juvenile form. Among the synapomorphies that attest to the monophyly of the group, the stage of leptocephalous larvae in development is certainly the most interesting. The number of orders and the total number of species in each group (updated July 2018 according to Eschmeyer et al., 2018) are informed on the right.Įlopomorpha are primarily marine fish, including the tarpon and eels. The five groups included in boxes have representatives in Neotropical Ichthyofauna. Phylogeny of Actinopterygii, detailing the relationship of the classes Cladistia and Actinopteri, the subclasses Chondrostei and Neopterygii, the infraclasses Holostei and Teleostei, and the cohorts Elopomorpha, Euteleosteomorpha, Otomorpha, and Osteoglossomorpha.
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