Name: Cricosaurus ‭(‬Ring lizard‭)‬.
Phonetic: Cre-ko-sor-us.
Named By: Wagner‭ ‬-‭ ‬1858.
Classification: Chordata,‭ ‬Reptilie,‭ ‬Thalattosuchia,‭ ‬Metriorhynchidae,‭ ‬Rhacheosaurini.
Species: C.‭ ‬elegans‭ (‬type‭)‬,‭ C. albersdoerferi, ‬C.‭ ‬araucanensis,‭ ‬C.‭ ‬bambergensis,‭ ‬C.‭ ‬gracilis,‭ ‬C.‭ ‬lithographicus,‭ ‬C.‭ ‬macrospondylus, C. puelchorum,‭ ‬C.‭ ‬saltillensis,‭ ‬C.‭ ‬schroderi,‭ ‬C.‭ ‬schroederi,‭ ‬C.‭ ‬suevicus,‭ ‬C.‭ ‬vignaudi.
Diet: Carnivore/Piscivore.
Size: Larger species up to‭ ‬3‭ ‬meters long.
Known locations: Argentina,‭ ‬France,‭ ‬Germany,‭ ‬Mexico.
Time period: Late Jurassic.
Fossil representation: Several individuals,‭ ‬some almost complete.

       Cricosaurus is a genus of thalattosuchian‭ (‬sea crocodile‭) ‬known to have lived in the seas around Europe and the Eastern coasts of the Americas.‭ ‬Cricosaurus seems to have been among the smaller thalattosuchians,‭ ‬and one with narrower more gracile jaws.‭ ‬This would denote a specialisation in hunting smaller prey animals such as fish and squid.‭ ‬Analysis of Cricosaurus skulls has confirmed the presence of salt glands,‭ ‬organs that specialise in removing the excess salts from sea water that has been consumed,‭ ‬either by drinking or eating.
       Pelvis studies on some specimens of Cricosaurus have to the suggestion that Cricosaurus was viviparous,‭ ‬meaning that they gave birth to live young instead of laying eggs on land.‭ ‬This would make sense since evolutionary adaptations for swimming would have made returning to the land very difficult.‭ ‬Vivapory has also been confirmed in many other types of marine reptiles.

Further reading
-‭ ‬Zur Kenntniss der Saurier aus den lithographischen Schiefern.‭ ‬Abhandlungen der Mathemat.‭ ‬-‭ ‬Physikalischen Classe der Königlich Bayerischen Akademie der Wissenschaften‭ ‬8:‭ ‬415-528.‭ ‬-‭ ‬A.‭ ‬Wagner‭ ‬-‭ ‬1858.
-‭ ‬Die Reptilien der norddeutschen unteren Kreide.‭ ‬Zeitschrift der Deutschen geologischen Gesellschaft‭ ‬35:735-827.‭ ‬-‭ ‬Koken‭ ‬-‭ ‬1883.
-‭ ‬Die Meerkrokodile‭ (‬Thalattosuchia n.‭ ‬g.‭) ‬eine neue Sauriergruppe der Juraformation.‭ ‬-‭ ‬Jahreshefte des Vereins für vaterländische Naturkunde,‭ ‬Württemberg‭ ‬57:‭ ‬409-418.‭ ‬-‭ ‬E.‭ ‬Fraas‭ ‬-‭ ‬1901.
-‭ u‬n nuevo cocodrilo marino‭ (‬Thalattosuchia,‭ ‬Metriorhynchidae‭) ‬de la Formación Vaca Muerta‭ (‬Jurasico,‭ ‬Tithoniano‭) ‬de la Provincia de Neuquén‭ (‬República Argentina‭)‬.‭ ‬-‭ ‬Congreso Geológico Chileno‭ ‬1:‭ ‬c1-c21.‭ ‬-‭ ‬Z.‭ ‬B.‭ ‬Gasparini‭ & ‬D.‭ ‬Dellapé‭ ‬-‭ ‬1976.
-‭ ‬Geosaurus vignaudi n.‭ ‬sp.‭ (‬Crocodyliformes:‭ ‬Thalattosuchia‭)‬,‭ ‬first evidence of metriorhynchid crocodilians in the Late Jurassic‭ (‬Tithonian‭) ‬of central-east Mexico‭ (‬State of Puebla‭)‬.‭ ‬-‭ ‬Canadian Journal of Earth Sciences‭ ‬39‭(‬10‭)‬:1467-1483‭ ‬-‭ ‬E.‭ ‬Frey,‭ ‬M.-C.‭ ‬Buchy,‭ ‬W.‭ ‬Stinnesbeck‭ & ‬J.G.‭ ‬Lopez-Oliva‭ ‬-‭ ‬2002.
-‭ ‬A new thalattosuchian crocodyliform from the Tithonian‭ (‬Upper Jurassic‭) ‬of northeastern Mexico.‭ ‬-‭ ‬Comptes Rendus Palevol‭ ‬5:785-794.‭ ‬-M.-C.‭ ‬Buchy,‭ ‬P.‭ ‬Vignaud,‭ ‬E.‭ ‬Frey,‭ ‬W.‭ ‬Stinnesbeck‭ & ‬A.‭ ‬H.‭ ‬G.‭ ‬Gonzalez‭ ‬-‭ ‬2006.
-‭ ‬What is Geosaurus‭? ‬Redescription of Geosaurus giganteus‭ (‬Thalattosuchia:‭ ‬Metriorhynchidae‭) ‬from the Upper Jurassic of Bayern,‭ ‬Germany.‭ ‬-‭ ‬Zoological Journal of the Linnean Society,‭ ‬157:‭ ‬551-585.‭ ‬-‭ ‬M.‭ ‬T.‭ ‬Young‭ & ‬M.‭ ‬B.‭ ‬de Andrade‭ ‬-‭ ‬2009.
-‭ ‬A new Patagonian species of Cricosaurus‭ (‬Crocodyliformes,‭ ‬Thalattosuchia‭)‬:‭ ‬first evidence of Cricosaurus in Middle-Upper Tithonian lithographic limestone from Gondwana.‭ ‬-‭ ‬Palaeontology‭ ‬56‭(‬3‭)‬:663-678.‭ ‬-‭ ‬Y.‭ ‬Herrera,‭ ‬Z.‭ ‬Gasparini‭ & ‬M.‭ ‬S.‭ ‬Fernández‭ ‬-‭ ‬2013.
-‭ ‬A new species of the metriorhynchid crocodylomorph Cricosaurus from the Upper Jurassic of southern Germany.‭ ‬-‭ ‬Acta Palaeontologica Polonica‭ ‬64‭(‬2‭)‬:‭ ‬343-356.‭ ‬-‭ ‬S.‭ ‬Sachs,‭ ‬M.‭ ‬T.‭ ‬Young,‭ ‬P.‭ ‬Abel‭ & ‬H.‭ ‬Mallison‭ ‬-‭ ‬2019.
- Cricosaurus (Thalattosuchia, Metriorhynchidae) survival across the J/K boundary in the High Andes (Mendoza Province, Argentina). - Cretaceous Research - Yanina Herrera, Marta S.Fernández & Verónica V.Vennari - 2020.
- A new species of Cricosaurus (Thalattosuchia: Crocodylomorpha) from southern Germany: the first three-dimensionally preserved Cricosaurus skull from the Solnhofen Archipelago. - Journal of Systematic Palaeontology. 19 (2): 145–167. - Y. Herrera, M. Aiglstorfer & M. Aiglstorfer - 2021.


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