Pycnodus

Name: Pycnodus ‭(‬crowded teeth‭)‬.
Phonetic: Pik-noe-dus.
Named By: Agassiz‭ ‬-‭ ‬1835.
Classification: Chordata,‭ ‬Actinopterygii,‭ ‬Pycnodontiformes,‭ ‬Pycnodontidae.
Species: P.‭ ‬platessus‭ (‬type‭)‬,‭ ‬P.‭ ‬bicresta,‭ ‬P.‭ ‬flabellatus,‭ ‬P.‭ ‬granulatus,‭ ‬P.‭ ‬jugleri,‭ ‬P.‭ ‬lametae,‭ ‬P.‭ ‬minutus,‭ ‬P.‭ ‬orbicularis,‭ ‬P.‭ ‬preufsii.
Diet: Carnivore.
Size: Roughly about‭ ‬12‭ ‬centimetres long,‭ ‬some variation between species.
Known locations: Across Europe,‭ ‬also known from north and east Africa,‭ ‬Saudi Arabia and India.
Time period: Oxfordian of the Jurassic through to the Lutetian of the Eocene.
Fossil representation: Multiple individuals.

       Pycnodus have deep bodies with greatly reduced pectoral and pelvic fins,‭ ‬altogether suggesting a slow swimming lifestyle.‭ ‬The name Pycnodus is derived from the batteries of grinding teeth within the mouth which would have been very efficient at processing shelled molluscs,‭ ‬small crustaceans and echinoderms‭ (‬urchins and starfish‭)‬.‭ ‬The broad temporal and geographic grange of the genus indicates that Pycnodus‭ ‬were highly successful in their ecological niche.

Further reading
-‭ ‬Eocene ichthyofauna from the Subathu Formation,‭ ‬Northwestern Himalaya,‭ ‬India.‭ ‬-‭ ‬K.‭ ‬Kumar‭ & ‬R.‭ ‬S.‭ ‬Loyal‭ ‬-‭ ‬1987.



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