Martinectes
| Martinectes Temporal range: Late Cretaceous (late Campanian),
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| Skeleton mount, University of Michigan Museum of Natural History | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Reptilia |
| Superorder: | †Sauropterygia |
| Order: | †Plesiosauria |
| Superfamily: | †Plesiosauroidea |
| Family: | †Polycotylidae |
| Subfamily: | †Polycotylinae |
| Clade: | †Dolichorhynchia |
| Genus: | †Martinectes Clark, O'Keefe & Slack, 2023 |
| Type species | |
| †Martinectes bonneri Adams, 1997
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| Synonyms | |
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Martinectes is an extinct genus of polycotylid plesiosaur from the Late Cretaceous (Campanian stage) of North America and possibly European Russia. The genus contains a single species M. bonneri, known from multiple skeletons and skulls. Martinectes was historically considered to represent a species of the genus Trinacromerum and later Dolichorhynchops before it was moved to its own genus. It was a large polycotylid measuring around 5.5–7 metres (18–23 ft) long.