Pachypleurosaurus

Name: Pachypleurosaurus ‭(‬Thick rib lizard‭)‬.
Phonetic: Pak-ee-plur-o-sore-us.
Named By: Broili‭ ‬-‭ ‬1927.
Classification: Chordata,‭ ‬Reptilia,‭ ‬Sauropterygia,‭ ‬Nothosauroidea,‭ ‬Pachypleurosauria.
Species: P.‭ ‬edwardsi‭ (‬type‭)‬,‭ ‬P.‭ ‬staubi.
Diet: Carnivore/Piscivore.
Size: About‭ ‬1‭ ‬meter long.
Known locations: Italy‭ ‬-‭ ‬Calcare di Meride Formation and Switzerland‭ ‬-‭ ‬Meride Formation.
Time period: Ladinian of the Triassic.
Fossil representation: Few individuals.

       The type genus of the Pachypleurosauria,‭ ‬Pachypleurosaurus would have been a relative of the more famous nothosaurs,‭ ‬yet still be distinct enough to not be classed as a nothosaurine.‭ ‬It should be remembered however that both nothosaurines and pachypleurosaurines are still both classified as nothosauroids due to their physical similarities.
       The name Pachypleurosaurus means‭ ‘‬thick rib lizard‭’‬,‭ ‬and is a reference to the thickness of the rib.‭ ‬Such thick ribs are uncommon in terrestrial animals,‭ ‬but in aquatic animals they are quite common since the greater weight helps the animal to stay under the water,‭ ‬rather than just bob about upon the surface.‭ ‬Despite this buoyancy adaptation however,‭ ‬Pachypleurosaurus still retained limbs and feet that would have been useful on the land.‭ ‬This indicates that like their nothosaurine relatives,‭ ‬Pachypleurosaurus would still rest on the shore when not actually hunting in the sea.

Further reading
Les reptiles du Trias moyen du Monte San Giorgio,‭ ‬Tessin‭ [‬The reptiles from the Middle Triassic of Monte San Giorgio,‭ ‬Tessino‭] ‬-‭ ‬A.‭ ‬Toroni‭ ‬-‭ ‬1979.
-‭ ‬On two new specimens of Pachypleurosaurus‭ (‬Reptilia:‭ ‬Nothosauria‭) ‬-‭ ‬N.‭ ‬J.‭ ‬Mateer‭ ‬-‭ ‬1976.



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