Tricleidus

{{Short description|Extinct genus of reptiles}}

{{Use dmy dates|date=April 2022}}

{{Automatic taxobox

| fossil_range = Middle Jurassic, {{fossilrange|Callovian}}

| image = Tricleidus.jpg

| image_caption = Holotype specimen

| taxon = Tricleidus

| authority = Andrews, 1909

| subdivision_ranks = Species

| subdivision =

• T. seeleyi Andrews, 1909 (type)

}}

Tricleidus is an extinct genus of cryptoclidid{{Cite journal|author1=Ketchum, H. F. |author2=Benson, R. B. J. |name-list-style=amp |year=2010 |title=Global interrelationships of Plesiosauria (Reptilia, Sauropterygia) and the pivotal role of taxon sampling in determining the outcome of phylogenetic analyses |journal=Biological Reviews |volume=85 |issue=2 |pages=361–392 |doi=10.1111/j.1469-185X.2009.00107.x |pmid=20002391|s2cid=12193439 }} plesiosaur known from only specimen (BMNH R3539) from the middle Jurassic of United Kingdom.{{cite journal|author=Andrews, C. W. |year=1910 |title=A Descriptive Catalogue of the Marine Reptiles of the Oxford Clay, Part I |journal=British Museum (Natural History), London, England |pages=205 pp}} It was first named by Andrews in 1909 and the type species is Tricleidus seeleyi.

File:Tricleidus skeletal.jpg

One species, T. svalbardensis,Persson, P.O. (1962): Plesiosaurians from Spitsbergen. Norsk Polarinstitutt, Årbok 1961, p. 62-68.

Oslo University Press, 169 pp. was moved into Colymbosaurus in 2012.{{cite journal|first1=E. M.|last1=Knutsen|first2=P. S.|last2=Druckenmiller|first3=J.|last3=Hurum|year=2012|title=Redescription and taxonomic clarification of {{‘}}Tricleidus{{’}} svalbardensis based on new material from the Agardhfjellet Formation (Middle Volgian)|journal=Norwegian Journal of Geology|volume=92|pages=175–186|url=http://www.geologi.no/images/NJG_articles/NJG_2_3_2012_10_Knutsen_etal_Pr.pdf}} It was found in the Agardhfjellet Formation, Norway.