Name: Pelagosaurus (‬Pelagic lizard‬).
Phonetic: Pel-ah-jik-sor-us.
Named By: H.‭ ‬G.‭ ‬Bronn‭ ‬-‭ ‬1841.
Synonyms: Mosellaesaurus.
Classification: Chordata,‭ ‬Reptilia,‭ ‬Archosauromorpha,‭ ‬Crocodylomorpha,‭ ‬Thalattosuchia,‭ ‬Teleosauridae.
Species: P.‭ ‬typus‭ (‬type‭)‬.
Diet: Piscivore.
Size: Up to about‭ ‬3‭ ‬meters long.
Known locations: France.‭ ‬England‭ ‬-‭ ‬Alum Shale Formation,‭ ‬Beacon Limstone Formation.‭ ‬Germany‭ ‬-‭ ‬Posidonia Shale Formation.‭ ‬Italy‭ ‬-‭ ‬Calcare di Sogno Formation.
Time period: Toarcian of the Jurassic.
Fossil representation: Several individuals in varying states of completeness.‭ ‬At least one juvenile is known.‭ ‬Osteoderms are also known.

       Pelagosaurus is a genus of thalattosuchian,‭ ‬more colloquially known as a‭ ‘‬marine crocodile‭’‬ that lived in the waters around Western Europe during the early Jurassic.‭ ‬Exactly what kind of thalattosuchian Pelagosaurus is depends upon who you ask,‭ ‬with one group describing the genus as a primitive metriorhynchid,‭ ‬while others state that it is actually a teleosaurid,‭ ‬and this is the opinion that most modern studies go along.
       Leaving behind the precise classification of this genus,‭ ‬Pelagosaurus was a fairly fast swimming predator of fish,‭ ‬and this is confirmed by the presence of fish fossils,‭ ‬including the genus Leptolepis within the fossils of some individual Pelagosaurus.‭ ‬Also,‭ ‬while Pelagosaurus had at least some osteoderms,‭ ‬the number and size were greatly reduced when compared to terrestrial‭ (‬land‭) ‬crocodiles,‭ ‬showing a development towards faster and more agile swimming over armour.
       Pelagosaurus means‭ ‘‬pelagic lizard‭'‬.‭ ‬For those not familiar with the word pelagic,‭ ‬it is basically used to describe an animal that lives in the open sea.‭ ‬However,‭ ‬because Pelagosaurus was a marine crocodile,‭ ‬it would have still needed to return to the land to lay eggs.

Further reading
-‭ ‬Über die fossilen Gaviale der Lias-Formation und der Oolithe.‭ ‬-‭ ‬Archiv für Naturgeschichte,‭ ‬Berlin‭ ‬8:77‭–‬82.‭ ‬-‭ ‬H.‭ ‬G.‭ ‬Bronn‭ ‬-‭ ‬1841.
-‭ ‬Pelagosaurus‭ (‬Mesosuchia,‭ ‬Crocodilia‭) ‬from the English Toarcian‭ (‬Lower Jurassic‭)‬.‭ ‬-‭ ‬Neues Jahrbuch für Geologie und Paläontologie,‭ ‬Monatshefte‭ ‬1979:475‭–‬485.‭ ‬-‭ ‬C.‭ ‬J.‭ ‬Duffin‭ ‬-‭ ‬1979.
-‭ ‬Position systématique et phylogénetique du genre Pelagosaurus Bronn,‭ ‬1841‭ (‬Crocodylia,‭ ‬Mesosuchia‭)‬,‭ ‬du Toarcian d’Europe.‭ ‬-‭ ‬Geobios‭ ‬13:783‭–‬786.‭ ‬-‭ ‬E.‭ ‬Buffetaut‭ ‬-‭ ‬1980.
-‭ ‬Pelagosaurus typus Bronn,‭ ‬1841‭ (‬Mesoeucrocodylia:‭ ‬Thalattosuchia‭) ‬from the Upper Lias‭ (‬Toarcian,‭ ‬Lower Jurassic‭) ‬of Somerset,‭ ‬England.‭ ‬-‭ ‬Journal of Vertebrate Paleontology‭ ‬26‭ (‬3‭)‬:‭ ‬621‭–‬635.‭ ‬-‭ ‬S.‭ ‬E.‭ ‬Pierce,‭ ‬M.‭ ‬J.‭ ‬Benton‭ ‬-‭ ‬2006.


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