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Contact

About the author
Email: plesiosauria@gmail.com
Follow: @adamstuartsmith

Higher taxa

  • Sauropterygia
  • Eosauropterygia
  • Eusauropterygia
  • Pachypleurosauria
  • Nothosauria
  • Pistosauroidea
  • Pistosauria
  • Plesiosauria
  • Pliosauroidea
  • Plesiosauroidea

Families

  • Aristonectidae
  • Brachauchenidae
  • Cimoliasauridae
  • Cryptoclididae
  • Elasmosauridae
  • Leptocleididae
  • Microcleididae
  • Plesiosauridae
  • Pliosauridae
  • Polycotylidae
  • Rhomaleosauridae

Genera

The genera section is under construction, active pages are indicated by an asterisk

  • A
  • Albertonectes
  • Alexeyisaurus
  • Alzadosaurus
  • Anningasaura
  • Aphrosaurus
  • * 'Apractocleidus'
  • * Archaeonectrus
  • * Aristonectes
  • * Attenborosaurus
  • Augustasaurus
  • Avalonnectes
  • B
  • Bathyspondylus
  • Bishanopliosaurus
  • * Bobosaurus
  • Borealonectes
  • Brachauchenius
  • * Brancasaurus
  • C
  • Callawayasaurus
  • 'Cimoliasaurus'
  • Colymbosaurus
  • * Cryptoclidus
  • D
  • Dolichorhynchops
  • E
  • * Edgarosaurus
  • * Elasmosaurus
  • Eoplesiosaurus
  • Eopolycotylus
  • * Eretmosaurus
  • Eromangasaurus
  • Eurycleidus
  • F
  • Fresnosaurus
  • Futabasaurus
  • G
  • Gallardosaurus
  • Georgiasaurus
  • H
  • Hauffiosaurus
  • Hydralmosaurus
  • Hydrorion
  • Hydrotherosaurus
  • I
  • J
  • K
  • * Kaiwhekea
  • * Kimmerosaurus
  • * Kronosaurus
  • L
  • * Leptocleidus
  • Leurospondylus
  • * Libonectes
  • * Liopleurodon
  • Lusonectes
  • M
  • * Macroplata
  • Manemergus
  • * Maresaurus
  • Marmornectes
  • Mauisaurus
  • Megalneusaurus
  • * Meyerasaurus
  • Microcleidus
  • Morenosaurus
  • * 'Morturneria'
  • Muraenosaurus
  • N
  • Nichollssaura
  • O
  • * Occitanosaurus
  • 'Ogmodirus'
  • Opallionectes
  • P
  • * Pachycostasaurus
  • Pahasapasaurus
  • Palmulasaurus
  • Pantosaurus
  • * Peloneustes
  • Pistosaurus
  • Plesiopleurodon
  • Plesiopterys
  • * Plesiosaurus
  • Pliosaurus
  • Polycotylus
  • Polyptychodon
  • Q
  • R
  • * Rhomaleosaurus
  • S
  • Seeleyosaurus
  • Scanisaurus
  • * Simolestes
  • Sthenarosaurus
  • Stratesaurus
  • 'Stretosaurus'
  • Strongylokrotaphus
  • Styxosaurus
  • Sulcusuchus
  • T
  • Tatenectes
  • Terminonatator
  • * Thalassiodracon
  • * Thalassomedon
  • 'Thaumatosaurus'
  • *Thililua
  • Trememesacleis'
  • *Tricleidus
  • Trinacromerum
  • Tuarangisaurus
  • U
  • Umoonasaurus
  • V
  • Vinialesaurus
  • W
  • Wapuskanectes
  • Westphaliasaurus
  • Woolungasaurus
  • X
  • Y
  • Yuzhoupliosaurus
  • Z
  • Zarafasaura

Tricleidus Andrews, 1909

T. seeleyi is the type and only species of Tricleidus.

Classification

Sauropterygia --> Eosauropterygia --> Eusauropterygia --> Pistosauroidea --> Plesiosauria --> Plesiosauroidea --> Cryptoclididae

T. seeleyi Andrews, 1909

Material

Type material: BMNH R.3539. Disarticulated elements including most of skull and half postcranium.

Age and Location

Kosmoceras jason - Peltoceras athleta zones, Lowest deposits of the Oxford Clay, Callovian Stage, Upper Jurassic, from Fletton, near Peterborough, England.

Tricleidus images

  • Skull of Tricleidus in lateral view (from Brown, 1992)

  • Palate of Tricleidus in ventral view (from O'Keefe, 2003)

Popular pages

Liopleurodon

Plesiosaurus

Locomotion

Living plesiosaurs?

Crystal Palace plesiosaurs

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Further reading

Playtime

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The skeletons in the site header are (from left to right): Kronosaurus (in the Museum of Comparative Zoology, Harvard University, Cambridge), Thalassomedon (in the American Museum of Natural History, New York), Cryptoclidus (In the Hunterian Museum and Art Gallery, Glasgow), Rhomaleosaurus (in the Natural History Museum, London), Dolichorhynchops (in the Smithsonian Institution's National Museum of Natural History, Washington) and Thalassiodracon (in the Natural History Museum, London).

©2011 Copyright Adam S. Smith. This site opened in June 2001. Last updated April 2013.