Name: Canobius.
Phonetic: Can-o-be-us.
Named By: Traquair‭ ‬-‭ ‬1881.
Classification: Chordata,‭ ‬Actinopterygii,‭ ‬Palaeonisciformes.
Species: C.‭ ‬elegantulus,‭ ‬C.‭ ‬macrocephalus,‭ ‬C.‭ ‬politus,‭ ‬C.‭ ‬pulchellus,‭ ‬C.‭ ‬ramsayi.
Diet: Carnivore/Plankton feeder.
Size: About‭ ‬7‭ ‬centimetres long.
Known locations: Scotland.
Time period: Visean of the Carboniferous.
Fossil representation: Several specimens.

       Canobius was a small ray-finned fish of the early Carboniferous period.‭ ‬Canobius is noteworthy because it is one of the first genera of ray-finned fish which‭ ‬had a re-arrangement of the head and jaw bones so that the jaws hung vertically beneath the braincase.‭ ‬This had the effect of the jaws being capable of opening much wider than in primitive forms,‭ ‬but this adaptation went far beyond just feeding.‭ ‬A wider mouth opening meant that a greater amount of water could now pass over the gills,‭ ‬greatly increasing the rate of oxygen absorption from the water.‭ ‬This was a particularly significant adaptation because many of waters of the carboniferous ecosystems would have been filled with decaying plant matter,‭ ‬a process which meant that the water would have had a greatly reduced oxygen content.‭ ‬An adaptation to make the most of the available oxygen meant that Canobius could fare much better than more primitive fish forms in such waters.


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