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Tricleidus Temporal range: Middle Jurassic, Callovian PreꞒ Ꞓ O S D C P T J K Pg N ↓
Holotype specimen
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Superorder:	†Sauropterygia
Order:	†Plesiosauria
Family:	†Cryptoclididae
Subfamily:	†Cryptoclidinae
Genus:	†Tricleidus Andrews, 1909
Species
T. seeleyi Andrews, 1909 (type)

Tricleidus is an extinct genus of cryptoclidid plesiosaur known from only specimen (BMNH R3539) from the middle Jurassic of United Kingdom. It was first named by Andrews in 1909 and the type species is Tricleidus seeleyi.

One species, T. svalbardensis, was moved into Colymbosaurus in 2012. It was found in the Agardhfjellet Formation, Norway.

See also

• List of plesiosaur genera
• Timeline of plesiosaur research

References

1. Ketchum, H. F. & Benson, R. B. J. (2010). "Global interrelationships of Plesiosauria (Reptilia, Sauropterygia) and the pivotal role of taxon sampling in determining the outcome of phylogenetic analyses". Biological Reviews. 85 (2): 361–392. doi:10.1111/j.1469-185X.2009.00107.x. PMID 20002391. S2CID 12193439.
2. ^ Andrews, C. W. (1910). "A Descriptive Catalogue of the Marine Reptiles of the Oxford Clay, Part I". British Museum (Natural History), London, England: 205 pp.
3. Persson, P.O. (1962): Plesiosaurians from Spitsbergen. Norsk Polarinstitutt, Årbok 1961, p. 62-68. Oslo University Press, 169 pp.
4. Knutsen, E. M.; Druckenmiller, P. S.; Hurum, J. (2012). "Redescription and taxonomic clarification of 'Tricleidus' svalbardensis based on new material from the Agardhfjellet Formation (Middle Volgian)" (PDF). Norwegian Journal of Geology. 92: 175–186.

v t e Sauropterygia
Kingdom: Animalia Phylum: Chordata Class: Sauropsida Subclass: Diapsida Clade: Neodiapsida Sauropsida see Sauropsida Sauropterygia see below↓
Sauropterygia Sauropterygia Alexeyisaurus Atopodentatus Palatodonta? Pomolispondylus? Hanosaurus? Helveticosauridae? Eusaurosphargis? Helveticosaurus Saurosphargidae Hemilopas? Largocephalosaurus Prosaurosphargis Saurosphargis Sinosaurosphargis Stauromatodon? Placodontia Paraplacodus Pararcus Placodus Cyamodontoidea Cyamodus Glyphoderma Henodus Macroplacus Parahenodus Placochelys Protenodontosaurus Psephochelys Psephoderma Psephosauriscus Psephosaurus Sinocyamodus Eosauropterygia see below↓
Eosauropterygia Eosauropterygia Corosaurus Cymatosaurus Pachypleurosauria Anarosaurus Chusaurus Dactylosaurus Dawazisaurus? Diandongosaurus Dianmeisaurus Dianopachysaurus Hanosaurus? Honghesaurus Keichousaurus Luopingosaurus Majiashanosaurus Neusticosaurus Odoiporosaurus Prosantosaurus Panzhousaurus Qianxisaurus Serpianosaurus Wumengosaurus Nothosauroidea Brevicaudosaurus Hispaniasaurus? Sanchiaosaurus Simosauridae Paludidraco Simosaurus Nothosauridae Ceresiosaurus Germanosaurus Lariosaurus Metanothosaurus Nothosaurus Proneusticosaurus Silvestrosaurus Pistosauroidea Augustasaurus Bobosaurus Chinchenia Kwangsisaurus Pistosaurus Tanaisosaurus Wangosaurus Yunguisaurus Plesiosauria see below↓
Plesiosauria Plesiosauria Anningasaura Bathyspondylus Bobosaurus? Lindwurmia Sinopliosaurus Termatosaurus? Rhomaleosauridae Anningasaura? Archaeonectrus Atychodracon Avalonnectes Bishanopliosaurus? Borealonectes Eurycleidus Lindwurmia? Macroplata Maresaurus Meyerasaurus Rhomaleosaurus Sthenarosaurus Stratesaurus Thaumatodracon Yuzhoupliosaurus? Pliosauridae Anguanax Arminisaurus Attenborosaurus Cryonectes Hauffiosaurus Marmornectes Pachycostasaurus Rhaeticosaurus Thalassiodracon Thalassophonea Eardasaurus Gallardosaurus Liopleurodon Lorrainosaurus Megalneusaurus UANL-FCT-R2? Peloneustes "Pliosaurus" andrewsi Pliosaurus Simolestes Brachaucheninae Acostasaurus Brachauchenius Eiectus Kronosaurus Luskhan Makhaira Megacephalosaurus Monquirasaurus Polyptychodon Sachicasaurus Stenorhynchosaurus Plesiosauroidea Eoplesiosaurus Eretmosaurus Franconiasaurus Leurospondylus Plesiopharos Plesiopterys Plesiosaurus Westphaliasaurus Microcleididae Hydrorion Lusonectes Microcleidus Occitanosaurus Seeleyosaurus Cryptoclidia see below↓
Cryptoclidia Cryptoclididae Opallionectes Colymbosaurinae Abyssosaurus Colymbosaurus Djupedalia Pantosaurus Spitrasaurus Cryptoclidinae Cryptoclidus Kimmerosaurus Ophthalmothule Tatenectes Muraenosaurinae Muraenosaurus Picrocleidus Tricleidus? Vinialesaurus Xenopsaria Leptocleidia Hastanectes? Nichollssaura? Leptocleididae Brancasaurus Hastanectes? Leptocleidus Nichollssaura? Umoonasaurus? Vectocleidus Polycotylidae Edgarosaurus Manemergus Mauriciosaurus Thililua Palmulasaurinae Pahasapasaurus? Palmulasaurus Occultonectia Plesiopleurodon Sulcusuchus Polycotylinae Eopolycotylus Georgiasaurus Polycotylus Scalamagnus Serpentisuchops Trinacromerum Dolichorhynchia Dolichorhynchops Martinectes Unktaheela Elasmosauridae Callawayasaurus Cimoliasaurus Eromangasaurus Goniosaurus Jucha Lagenanectes Leivanectes Mauisaurus Ogmodirus Orophosaurus Plesioelasmosaurus Scanisaurus Wapuskanectes Woolungasaurus Euelasmosaurida Cardiocorax Libonectes Thalassomedon Elasmosaurinae Albertonectes Elasmosaurus Fluvionectes Hydrotherosaurus? Nakonanectes Styxosaurus Terminonatator Weddellonectia Aphrosaurus Chubutinectes Futabasaurus Fresnosaurus? Hydrotherosaurus? Kawanectes Marambionectes Morenosaurus Tuarangisaurus Vegasaurus Zarafasaura? Aristonectinae Alexandronectes Aristonectes Kaiwhekea Morturneria Wunyelfia

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• Cryptoclidids
• Middle Jurassic plesiosaurs of Europe
• Fossil taxa described in 1909
• Taxa named by Charles William Andrews
• Oxford Clay
• Sauropterygian genera
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