Akmonistion

Akmonistion is an extinct genus of holocephalian that lived in the Early Carboniferous. The genus contains a single species, A. zangerli. 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.[1][2]

Restoration

Akmonistion
Temporal range: Late Devonian–Early Carboniferous
Complete skeleton of A. zangerli (HMV8246, Hunterian Museum, University of Glasgow). Photograph taken by Dr. Keith Ingham, published in Coates & Sequira, 2001.
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Chondrichthyes
Order: †Symmoriida
Family: †Stethacanthidae
Genus: †Akmonistion
Species:
†A. zangerli
Binomial name
†Akmonistion zangerli
Coates & Sequeira, 2001

References
  1. Coates, M.I.; Sequeira, S.E.K. (2001). "A new stethacanthid chondrichthyan from the lower Carboniferous of Bearsden, Scotland" (PDF). Journal of Vertebrate Paleontology. 21 (3): 438–459. doi:10.1671/0272-4634(2001)021[0438:anscft]2.0.co;2.
  2. "Akmonistion zangerli". Palaeobiology Database.


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