Name: Deltoptychius.
Phonetic: Del-top-tie-key-us.
Named By: Morris‭ & ‬Roberts‭ ‬-‭ ‬1862.
Classification: Chordata,‭ ‬Chondrichthyes,‭ ‬Holocephali,‭ ‬Chimaeriformes,‭ ‬Deltoptychiidae.
Species: D.‭ ‬acutus,‭ ‬D.‭ ‬gibberuius.
Diet: Carnivore.
Size: Up to‭ ‬45‭ ‬centimetres long.
Known locations: British Isles.
Time period: Throughout the Carboniferous.
Fossil representation: Several specimens.

       A cartilaginous fish and therefore relative of sharks and rays,‭ ‬Deltoptychius is often seen as an early rat tail.‭ ‬For a modern analogy,‭ ‬Deltoptychius would be a more primitive version of a modern Chimaera monstrosa.‭ ‬These kinds of fish are usually deep water species that swim around in virtual darkness as very little to no sunlight penetrates to these ocean depths.‭ ‬The large round eyes of Deltoptychius would have processed whatever available light there was,‭ ‬though Deltoptychius may have found its food by scent.‭ ‬The thin tail means that Deltoptychius would not have been a powerful swimmer and would have been restricted to slow prey of scavenging bodies of other dead animals.
       Later on towards the mid Jurassic,‭ ‬new kinds Chimaeriformes such as Ischyodus had appeared,‭ ‬and these were near identical to the modern Chimaera monstrosa.

Further reading
-‭ ‬Catalogue of the Fossil Fishes in the British Museum‭ (‬Natural History‭) ‬Part‭ ‬1‭ ‬1-613,‭ ‬A.‭ ‬S.‭ ‬Woodward‭ ‬-‭ ‬1889.


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