author={Adam S. Smith},
  journal={Geology Today},
  • Adam S. Smith
  • Published 2008
  • Geography, Environmental Science
  • Geology Today
Plesiosaurs are an unusual and intriguing group of extinct aquatic reptiles ( Fig. 1 ). They are sauropterygians, a group known from an array of semi‐aquatic forms during the Triassic period: placodonts, pachypleurosaurs and nothosaurs. The first plesiosaurs are known from the very latest Triassic, but by the Early Jurassic plesiosaurs were cosmopolitan in distribution and lasted successfully to the latest Cretaceous, when they became victims of the K‐T extinction event. Plesiosaurs were… 
1 Citations

Crayfish gastroliths

Crayfish produce small button‐like gastroliths in their stomachs. These curious calcitic objects are increasingly common in lakes and streams in the UK and Europe as the invasive American crayfish



A Cladistic Analysis and Taxonomic Revision of the Plesiosauria (Reptilia: Sauropterygia)

The Plesiosauria is found to by polyphyletic due to the inclusion of the Polycotylidae; this second clade is instead a member of the Plesiosauroidea, and thus more closely related to elasmosaurs than to other ‘pliosaurs’.

Functional anatomy of the head of the large aquatic predator Rhomaleosaurus zetlandicus (Plesiosauria, Reptilia) from the Toarcian (Lower Jurassic) of Yorkshire, England

The skull and mandible of the type specimen of the large pliosauroid plesiosaur Rhomaleosaurus zetlandicus from the Toarcian of England are elongate, and adapted for powerful predatory activity in

Floating point: a computational study of buoyancy, equilibrium, and gastroliths in plesiosaurs

Three-dimensional mathematical/computational models of three types of plesiosaur (Liopleurodon - short neck, Cryptoclidus - medium neck, and Thalassomedon - long neck) were used to investigate

The evolution of plesiosaur and pliosaur morphotypes in the Plesiosauria (Reptilia: Sauropterygia)

  • F. O'Keefe
  • Geography, Environmental Science
  • 2002
Abstract The dichotomy between short-necked, large-headed “pliosaurs” and long-necked, small-headed “plesiosaurs” has formed the basis of plesiosaur taxonomy for over one hundred years. Recent work

The locomotion of plesiosaurs

  • Neues Jahrbuch für Geologie und Paläontologie
  • 1993

The locomotion of plesiosaurs. Neues Jahrbuch für Geologie und Paläontologie, Abhandlugen

  • 1975