Biology:Akmonistion

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Short description: Extinct genus of cartilaginous fishes

Akmonistion
Temporal range: Serpukhovian
Akmonistion zangerli Coates & Sequeira.jpg
Holotype fossil
Scientific classification edit
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Chondrichthyes
Subclass: Holocephali
Order: Symmoriiformes
Family: Stethacanthidae
Genus: Akmonistion
Species:
A. zangerli
Binomial name
Akmonistion zangerli
Coates & Sequeira, 2001

Akmonistion is an extinct genus of holocephalian that lived in the Early Carboniferous. The genus contains a single species, A. zangerli, discovered by Stan Wood in 1982.[1] 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 in Scotland.[2][3] The genus name is derived from the Ancient Greek “akmon” (“anvil”) + “istion” (“sail”) referring to the appearance of its first dorsal fin.[2] It reached 62 cm (24 in) in length.[2]

References

  1. Wood, S.P. (1982). "New basal Namurian (Upper Carboniferous) fishes and crustaceans found near Glasgow". Nature 297: 574-577. 
  2. 2.0 2.1 2.2 Coates, M.I.; Sequeira, S.E.K. (2001). "A new stethacanthid chondrichthyan from the lower Carboniferous of Bearsden, Scotland". Journal of Vertebrate Paleontology 21 (3): 438–459. doi:10.1671/0272-4634(2001)021[0438:anscft2.0.co;2]. https://pondside.uchicago.edu/oba/faculty/coates/CoatesSequeira2001Akmonist.pdf. 
  3. "Akmonistion zangerli". https://paleobiodb.org/classic/checkTaxonInfo?taxon_no=248785&is_real_user=1. 

Wikidata ☰ Q618225 entry