Name: Gyroptychius.
Phonetic: Gry-op-tie-ke-us.
Named By: F.‭ ‬M’Coy‭ ‬-‭ ‬1848.
Synonyms: Glyptolepis microlepidotus.
Classification: Chordata,‭ ‬Sarcopterygii,‭ ‬Coelacanthiformes.
Species: G.‭ ‬agassizi,‭ ‬G.‭ ‬microlepidotus.
Diet: Carnivore/Piscivore.
Size: About‭ ‬30‭ ‬centimetres long.
Known locations: Scotland.
Time period: Mid Devonian.
Fossil representation: Few specimens.

       Gyroptychius was a streamlined lobe-finned fish that is so far known from Western Europe,‭ ‬specifically Scotland.‭ ‬Like with many of its relatives,‭ ‬Most of the fins on Gyroptychius were situated more towards the rear of the body‭ (‬with the exception of the pectoral fins,‭ ‬an arrangement that would have increased the ability of the tail to push against the water and propel the fish forwards.‭ ‬Like many other genera,‭ ‬Gyroptychius is also noted as having short jaws.‭ ‬These jaws meant that Gyroptychius had a higher bite force,‭ ‬not by physical strength of the muscles,‭ ‬but because the force of the jaw closing muscles were nearer the point of jaw articulation.‭ ‬The principal of this is the same as if you use a pair of long nose pliers,‭ ‬using just the tips allows you to reach things,‭ ‬but placing things near the point of articulation allows you to more easily crush things.

More information on the above fish can be found on their corresponding pages; Ceratodus, Chinlea, Dipnorhynchus, Dipterus, Eusthenopteron, Gooloogongia, Griphognathus, Gyroptychius, Holoptychius, Hyneria, Macropoma, Mandageria, Osteolepis, Panderichthys, Rhizodus, Strunius, Tiktaalik (upper estimate).

Further reading
- Gyroptychius (Rhipidistia, Osteolepidae) from the Middle Devonian of Scotland - Annals and Magazine of Natural History Series 13 - Keith Stewart Thomson.


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