''Acregoliath'' is an extinct genus of

ray-finned fish Actinopterygii (; ), members of which are known as ray-finned fish or actinopterygians, is a class of bony fish that comprise over 50% of living vertebrate species. They are so called because of their lightly built fins made of webbings of sk ...

that existed during the middle of

Miocene The Miocene ( ) is the first epoch (geology), geological epoch of the Neogene Period and extends from about (Ma). The Miocene was named by Scottish geologist Charles Lyell; the name comes from the Greek words (', "less") and (', "new") and mea ...

epoch, about 13.76 to 13.34 million years ago. It is known from very fragmentary remains which consist of several scales that were found in Brazil. Judging from the size of the scales (dorsoventral height up to , thickness up to ), ''Acregoliath'' is believed to be a very large freshwater fish. But due to the fragmentary nature of the fossils, its exact size and appearance are difficult to reconstruct. Its scale morphology has been compared with extant

osteoglossiform Osteoglossiformes , meaning "bony tongues" in Ancient Greek, is a relatively primitive order (biology), order of ray-finned fish that contains two sub-orders, the Osteoglossoidei and the Notopteroidei. All of at least 245 living species inhabit f ...

, dipnoan, or siluriform fish especially the loricarioid.

References

Monotypic prehistoric ray-finned fish genera Prehistoric teleostei Miocene fish Fossils of Brazil Serravallian genera Enigmatic ray-finned fish taxa Fossil taxa described in 1989 {{paleo-rayfinned-fish-stub