Steneosaurus

Steneosaurus is an extinct genus of teleosaurid crocodyliform from the Early Jurassic to Early Cretaceous (Toarcian to Berriasian). Fossil specimens have been found in England, France, Germany, Switzerland and Morocco. The largest species, S. heberti, reached up to 5 m (16.5 ft) long, though 2.5–3.5 m was far more common.

Species
Species in this genus are traditionally classed into two skull groups: longirostrine (long, narrow jaws) and brevirostrine (short, broad jaws).

Longirostrine

 * S. baroni: Madagascar from the Bathonian.
 * S. bollensis: Western Europe (England, France and Germany) from the Toarcian.
 * S. boutilieri: Western Europe (England, France and Switzerland) from the Bathonian.
 * S. gracilirostris: Western Europe (England) from the Toarcian.
 * S. heberti: Western Europe (France) from the Callovian and Oxfordian.
 * S. jugleri: Western Europe (Germany and Switzerland) from the late Kimmeridgian and early Tithonian. Was originally the type species of the genus Sericodon
 * S. larteti: Western Europe (England and France) from the Bathonian.
 * S. leedsi: Western Europe (England and France) from the Callovian.
 * S. megarhinus: Western Europe (England) from the late Kimmeridgian.
 * S. megistorhynchus: (type) Western Europe (France) from the Bathonian.
 * S. priscus: Western Europe (Germany) from the early Tithonian. Also is the type species of the genus Aeolodon.

Brevirostrine

 * S. brevior: Western Europe (England) from the Toarcian.
 * S. edwardsi: Western Europe (England and France) from the Callovian and Oxfordian.
 * S. obtusidens: Western Europe (England) from the Callovian.

Evolutionary relationships
A recent phylogenetic analysis into the evolutionary relationships of Thalattosuchia did not support the monophyly of Steneosaurus, as the genera Machimosaurus and Teleosaurus both fell within Steneosaurus.