Name: Osteolepis ‭(‬Bone scale‭)‬.
Phonetic: Os-te-o-lep-iss.
Named By: Pander‭ ‬-‭ ‬1829‭?
Classification: Chordata,‭ ‬Sarcopterygii,‭ ‬Tetrapodomorpha,‭ ‬Osteolepidida,‭ ‬Osteolepiformes,‭ ‬Osteolepidae.
Species: O.‭ ‬macrolepidotus,‭ ‬O.‭ ‬microlepidotus.
Diet: Carnivore/Piscivore.
Size: About‭ ‬20‭ ‬centimetres long.
Known locations: Possibly worldwide.
Time period: Mid Devonian.
Fossil representation: Many specimens.

       A fairly small lobe-finned fish,‭ ‬Osteolepis is noted for having heavy bony scales,‭ ‬features that may have helped with buoyancy issues.‭ ‬Even more interesting though was an outer covering of cosmine,‭ ‬a slightly spongy bony material that is known to have covered the scales of lobe-finned fish.‭ ‬This cosmine had a series of channels running through so that the sensory organs underneath still had contact with the water.‭ ‬This would have allowed Osteolepis,‭ ‬and other lobe-finned fish to have detected even minute changes in water pressure caused by passing aquatic animals.

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
-‭ ‬Cosmine and Cosmine Growth‭ ‬-‭ ‬Tor ěrvig‭ ‬-‭ ‬1969.
-‭ ‬A review of cosmine:‭ ‬Its structure,‭ ‬development,‭ ‬and relationship to other forms of the dermal skeleton in osteichthyans‭ ‬-‭ ‬Deborah K.‭ ‬Meinke‭ ‬-‭ ‬1984.


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