''Neosteneosaurus'' is a genus of

machimosaurid Machimosauridae is an extinct family of teleosauroid thalattosuchian crocodyliforms. Text was copied from this source, which is available under Creative Commons Attribution 4.0 International License The family was first identified in 2016, ...

, known from the

Middle Jurassic The Middle Jurassic is the second epoch of the Jurassic Period. It lasted from about 174.1 to 163.5 million years ago. Fossils of land-dwelling animals, such as dinosaurs, from the Middle Jurassic are relatively rare, but geological formations co ...

Oxford Clay of the UK, and

Marnes de Dives The Marnes de Dives is a geological formation in Normandy, France. It dates back to the upper part of the Callovian stage of the Middle Jurassic.Weishampel, David B; et al. (2004). "Dinosaur distribution (Middle Jurassic, Europe)." In: Weishampel, ...

, France. The type species, ''N. edwardsi'', was originally named as a species of '' Steneosaurus'' in 1868, but was moved to its own genus in 2020. ''Steneosaurus durobrivensis'' and ''Steneosaurus hulkei'' are considered

junior synonym The Botanical and Zoological Codes of nomenclature treat the concept of synonymy differently. * In botanical nomenclature, a synonym is a scientific name that applies to a taxon that (now) goes by a different scientific name. For example, Linna ...

s. In 2015, it was estimated at more than in length. In 2016, this estimate was revised down to , but even with such measurement, this animal remains to be the largest known Middle Jurassic crocodylomorph.

References

{{Taxonbar, from=Q104862159 Thalattosuchians Prehistoric pseudosuchian genera Callovian life Oxfordian life Middle Jurassic reptiles of Europe Jurassic England Fossils of England Jurassic France Fossils of France Fossil taxa described in 2020