''Akmonistion'' is an

extinct Extinction is the termination of an organism by the death of its Endling, last member. A taxon may become Functional extinction, functionally extinct before the death of its last member if it loses the capacity to Reproduction, reproduce and ...

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

cartilaginous fish Chondrichthyes (; ) is a class of jawed fish that contains the cartilaginous fish or chondrichthyans, which all have skeletons primarily composed of cartilage. They can be contrasted with the Osteichthyes or ''bony fish'', which have skeleto ...

that lived in the

Early Carboniferous Early may refer to: Places in the United States * Early, Iowa, a city * Early, Texas, a city * Early Branch, a stream in Missouri * Early County, Georgia * Fort Early, Georgia, an early 19th century fort Music * Early B, stage name of Jamaican d ...

. The genus contains a single species, ''A. zangerli'', discovered by Stan Wood in 1982. It is distinguished by an unusual enlarged formation of the dorsal fin, called a "spine-brush complex", of unknown function. This is also found in the better known genus '' Stethacanthus''. Remains have only been found near

Bearsden Bearsden ( ) is a town in East Dunbartonshire, Scotland, on the northwestern fringe of Greater Glasgow, approximately from the Glasgow city centre, city centre. The Roman Empire, Roman Antonine Wall runs through the town, and the remains of ...

Scotland Scotland is a Countries of the United Kingdom, country that is part of the United Kingdom. It contains nearly one-third of the United Kingdom's land area, consisting of the northern part of the island of Great Britain and more than 790 adjac ...

. The genus name is derived from the Ancient Greek “''akmon''” (“anvil”) + ''“istion''” (“sail”) referring to the appearance of its first dorsal fin. It reached in length.

References

Symmoriiformes Carboniferous cartilaginous fish Carboniferous fish of Europe Fossil taxa described in 2001 {{paleo-cartilaginous-fish-stub