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Seeleyosaurus is an extinct genus of plesiosaur from Germany and possibly also Russia. Two species were known: the type , S. guilelmiimperatoris , and the now obsolete species S. holzmadensis , [ 1 ] which has since been absorbed into S. guilelmiimperatoris .
Like all other plesiosaurs, Brachauchenius has a short tail, a massive trunk and two pairs of large flippers. [ 22 ] [ 23 ] [ 24 ] Like most Turonian pliosaurs, the measurement of Brachauchenius is quite modest, [ 18 ] the holotype specimen having a maximum length estimated at 5.3 m (17 ft) for a body mass estimated at 2.2 t (2.2 long tons; 2.4 ...
Size comparison. Sachicasaurus was a large pliosaur, with the type specimen measuring approximately 10 metres (33 ft) long and weighing 17 metric tons (19 short tons). [1] [2] The holotype specimen, MP111209-1, was found in 2013 and is known from a near complete skull, and postcranial elements including a complete hindlimb and various vertebrae.
Pliosauroidea is an extinct clade of plesiosaurs, known from the earliest Jurassic to early Late Cretaceous.They are best known for the subclade Thalassophonea, which contained crocodile-like short-necked forms with large heads and massive toothed jaws, commonly known as pliosaurs.
Restoration Detail of Thalassomedon skull at the American Museum of Natural History. Thalassomedon is among the largest elasmosaurids, with the holotype measuring 10.86 metres (35.6 ft) long and weighing more than 4.44 metric tons (4.89 short tons).
Nichollssaura was a small plesiosaur, estimated up to 2.6–2.9 m (8.5–9.5 ft) in length and 135 kg (298 lb) in body mass based on a complete specimen (TMP 1994.122.1). [5] [6] It fills an approximate 40-million-year gap in the fossil record of North American plesiosaurs. Life restoration of two individuals
Plesiosaurs fossils which were discovered at Street (e.g. Avalonnectes and Thalassiodracon), or at penecontemporaneous strata such as the Watchet locality, represent the earliest known occurrence of the Plesiosauria. Hence, Eoplesiosaurus is the oldest plesiosauroid and one of the oldest plesiosaurs, to date. [1]
Rhomaleosauridae is a family of plesiosaurs from the Earliest Jurassic to the latest Middle Jurassic (Hettangian to Callovian stages) of Europe, North America, South America and possibly Asia. Most rhomaleosaurids are known from England , many specifically from lower Blue Lias deposits that date back to the earliest Jurassic , just at the ...