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A new pliosaurid from the Pliensbachian, Early Jurassic of Normandy, Northern France

100%

Vincent P., Bardet N., Mattioli E.

Acta Palaeontologica Polonica

2013

tom 58

nr 3

Complete plesiosaur skeletons are relatively abundant in the Lower Jurassic of England and Germany, but are exceptional in France. A new specimen from Normandy (northern France), including incomplete skull, palate and mandible with several associated vertebrae, is here described and its pliosauroid affinities are discussed. Comparison of this new specimen with other plesiosaurians indicates that it belongs to a new genus and species: Cryonectes neustriacus. This new plesiosaurian taxon represents one of the most complete pliosaurids reported from the Pliensbachian, a stage that has yielded very few diagnostic plesiosaurian remains. Our preliminary phylogenetic analysis places Cryonectes in a basal position among Pliosauridae, and suggests that the radiation of this clade occurred several millions of years earlier than previously thought. This new taxon contributes to our understanding of Early Jurassic plesiosaur diversity.

A mysterious giant ichthyosaur from the lowermost Jurassic of Wales

64%

Martin J. E., Vincent P., Suan G., Sharpe T., Hodges P., Williams M., Howells C., Fischer V.

Acta Palaeontologica Polonica

2015

tom 60

nr 4

Ichthyosaurs rapidly diversified and colonised a wide range of ecological niches during the Early and Middle Triassic period, but experienced a major decline in diversity near the end of the Triassic. Timing and causes of this demise and the subsequent rapid radiation of the diverse, but less disparate, parvipelvian ichthyosaurs are still unknown, notably because of inadequate sampling in strata of latest Triassic age. Here, we describe an exceptionally large radius from Lower Jurassic deposits at Penarth near Cardiff, south Wales (UK) the morphology of which places it within the giant Triassic shastasaurids. A tentative total body size estimate, based on a regression analysis of various complete ichthyosaur skeletons, yields a value of 12-15 m. The specimen is substantially younger than any previously reported last known occurrences of shastasaurids and implies a Lazarus range in the lowermost Jurassic for this ichthyosaur morphotype.

Ograniczanie wyników

2 Acta Palaeontologica Polonica

2 Vincent P.

1 Bardet N.

1 Fischer V.

1 Hodges P.

1 Howells C.

1 Martin J. E.

1 Mattioli E.

1 Sharpe T.

1 Suan G.

1 Williams M.

1 2015

1 2013

Wyniki wyszukiwania

A new pliosaurid from the Pliensbachian, Early Jurassic of Normandy, Northern France

A mysterious giant ichthyosaur from the lowermost Jurassic of Wales