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At least five extinct genera, known only from fossils, are classified as osteoglossids; these date back at least as far as the Late Cretaceous.Other fossils from as far back as the Late Jurassic or Early Cretaceous are widely considered to belong to the arowana superorder Osteoglossomorpha.
The Asian arowana (Scleropages formosus) comprises several phenotypic varieties of freshwater fish distributed geographically across Southeast Asia. [3] While most consider the different varieties to belong to a single species, [4] [5] [6] [3] [7] work by Pouyaud et al. (2003) [8] differentiates these varieties into multiple species.
The silver arowana (Osteoglossum bicirrhosum) is a South American freshwater bony fish of the family Osteoglossidae.Silver arowanas are sometimes kept in aquariums, but they are predatory and require a very large tank.
Heterotis niloticus - MHNT. The African arowana or Nile arowana (Heterotis niloticus) is a species of bonytongue.Despite being called an "arowana", the African arowana is more closely related to arapaimas, the only other members in the subfamily Arapaiminae, than the South American, Asian, and Australian arowanas in the subfamily Osteoglossinae (Arapaiminae is sometimes considered to be a ...
The earliest fossils of anglerfish are from the Eocene Monte Bolca formation of Italy, and these already show significant diversification into the modern families that make up the order. [5]
The black arowana is native to tropical South America where restricted to the Rio Negro basin, including the Branco River. [3] [6] [7] Black arowanas were discovered in the 1970s in the Orinoco basins, but whether this is a natural population or the result of introductions by humans is disputed.
While the species is not currently assigned a conservation status by the IUCN due to lack of data, overfishing is assumed to threaten the wild population. [1] The empurau, as the species is known in Malaysia, is reportedly the most expensive edible fish in the country [6] and has been known to fetch up to RM1800 per kilogram of the fish.
The taxonomy of the genus Channa is incomplete, and a comprehensive revision of the family has not been performed. A phylogenetic study in 2010 has indicated the likelihood of the existence of undescribed species of channids in Southeast Asia, [4] and a more comprehensive phylogenetic study in 2017 indicated that several undescribed species exist in Asia (as well as an undescribed Parachanna ...