| Ectenosaurus Temporal range: 100–65 Ma Late Cretaceous |
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| Partial skeleton (A) and soft tissues (B) of Ectenosaurus clidastoides | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Reptilia |
| Order: | Squamata |
| Family: | †Mosasauridae |
| Parafamily: | †Russellosaurina |
| Subfamily: | †Plioplatecarpinae |
| Genus: | †Ectenosaurus Russell, 1967 |
| Type species | |
| †E. clidastoides (Merriam 1894) |
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Ectenosaurus is a genus of mosasaur from the Late Cretaceous period.
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