Temporal range: Toarcian – Callovian, 183–163 Ma
|Steneosaurus bollensis, Holzmaden Germany|
Steneosaurus is an extinct genus of teleosaurid crocodyliform from the Early Jurassic to Middle Jurassic (Toarcian to Callovian). 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 in this genus are traditionally classed into two skull groups: longirostrine (long, narrow jaws) and brevirostrine (short, broad jaws).
- 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.
- S. larteti: Western Europe (England and France) from the Bathonian.
- S. leedsi: Western Europe (England and France) from the Callovian.
- S. megistorhynchus: (type) Western Europe (France) from the Bathonian.
- S. pictaviensis: Western Europe (France) from the Callovian.
- S. brevior: Western Europe (England) from the Toarcian.
- S. edwardsi: Western Europe (England and France) from the Callovian.
A 2005 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. Reinforcing the paraphyly of Steneosaurus, the Callovian species "Steneosaurus" obtusidens has been recovered as the sister species of Machimosaurus in recent cladistic analyses of Thalattosuchia and renamed Lemmysuchus, while Steneosaurus bollensis was recovered in a basal position to other members of Steneosaurus sensu lato. Given the paraphyly of Steneosaurus, Macrospondylus von Meyer, 1830 is the earliest available generic name for S. bollensis.
From the semi-aquatic Oker locality in Lower Saxony, Germany (Kimmeridgian-age) two genera of teleosaurids (Steneosaurus and Machimosaurus) are known, in addition to the neosuchian genera Goniopholis and Knoetschkesuchus.
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- Martin, J. E. and Vincent, P. (2013), New remains of Machimosaurus hugii von Meyer, 1837 (Crocodilia, Thalattosuchia) from the Kimmeridgian of Germany. Fossil Record, 16: 179–196. doi:10.1002/mmng.201300009
- Karl H-V, Gröning E, Brauckmann C, Schwarz D, Knötschke N.2006. The Late Jurassic crocodiles of the Langenberg near Oker, Lower Saxony (Germany), and description of related materials (with remarks on the history of quarrying the “Langenberg Limestone” and “Obernkirchen Sandstone”). Clausthaler Geowissenschaften 5: 59–77.