From Wikipedia, the free encyclopedia
Jump to navigation Jump to search

Temporal range: Middle Jurassic, 164.7–163.5 Ma
Scientific classification edit
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Superorder: Sauropterygia
Order: Plesiosauria
Family: Pliosauridae
Genus: Marmornectes
Ketchum & Benson, 2011
M. candrewi
Binomial name
Marmornectes candrewi
Ketchum & Benson, 2011

Marmornectes is an extinct genus of pliosaurid known from the Bedfordshire of United Kingdom.[1]


Marmornectes is known from the holotype BEDFM 1999.201, articulated partial skeleton which preserved the skull. It was collected in 1999 from the Sigaloceras enodatum ammonoid subzone, of the Peterborough Member, Oxford Clay Formation, dating to the early Callovian stage of the late Middle Jurassic, about 164.7-163.5 million years ago. It was found in the monotypic locality of Quest Pit, east of Stewartby.[1]

It was a longirostrine pliosaurid with seven autapomorphies, and is most similar to Peloneustes philarchus. Nevertheless, a cladistic analysis found it to be basal to Peloneustes and other pliosaurids. An undescribed pliosaurid, NHMUK R2439, found to be the sister taxon of this genus.[1]


Marmornectes was first named by Hilary F. Ketchum and Roger B. J. Benson in 2011 and the type species is Marmornectes candrewi. The generic name is derived from marmor, Latin for "marble", and nectes, Greek for "swimmer", thus the meaning is "marble-swimmer". The specific name honors Chris Andrew for finding the only known specimen and donating it to Bedford Museum in 1998.[1]

See also[edit]


  1. ^ a b c d Hilary F. Ketchum and Roger B. J. Benson (2011). "A new pliosaurid (Sauropterygia, Plesiosauria) from the Oxford Clay Formation (Middle Jurassic, Callovian) of England: evidence for a gracile, longirostrine grade of Early-Middle Jurassic pliosaurids". Special Papers in Palaeontology. 86: 109–129. doi:10.1111/j.1475-4983.2011.01083.x (inactive 2018-09-21).