PBDB Taxon

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Morphology	Ecology and taphonomy	External Literature Search	Age range and collections

Steneosaurus heberti

Reptilia - Teleosauridae

Taxonomy

Steneosaurus heberti was named by Morel de Glasville (1876).

It was recombined as Proexochokefalos heberti by Johnson et al. (2020).

Sister species lacking formal opinion data

S. intermedius, S. subulidens

Synonyms

Steneosaurus depressus was named by Phizackerley (1951). Its type specimen is OUM J 1420, a skull (Near-complete skull and lower jaw, with most of the skeleton), and it is a 3D body fossil. Its type locality is Peterborough area, Leeds Collection, which is in a Callovian offshore mudstone in the Oxford Clay Formation of the United Kingdom.

It was synonymized subjectively with Steneosaurus durobrivensis by Adams-Tresman (1987); it was synonymized subjectively with Steneosaurus heberti by Pierce et al. (2009).
Steneosaurus meretrix was named by Phizackerley (1951). Its type specimen is 1639/1 (Dept. of Zoology, Oxford), a skull (Near-complete skull with lower jaw), and it is a 3D body fossil. Its type locality is Enslow Bridge (OUM), which is in a Bathonian terrestrial claystone in the Forest Marble Formation of the United Kingdom.

It was synonymized subjectively with Steneosaurus heberti by Pierce et al. (2009).

Synonymy list

Year	Name and author
1876	Steneosaurus heberti Morel de Glasville figs. fig. 4, pl. 6; fig. 2, pl. 9; fig. 1a, b
1951	Steneosaurus depressus Phizackerley
1951	Steneosaurus meretrix Phizackerley
1951	Steneosaurus depressus Phizackerley p. 1190 figs. Fig. 10a-b
2009	Steneosaurus heberti Pierce et al. p. 1086
2012	Steneosaurus heberti Bronzati et al.
2020	Proexochokefalos heberti Johnson et al.
2021	Steneosaurus heberti Hua et al.

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Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Deuterostomia
phylum	Chordata	Haeckel 1874
subphylum	Vertebrata
superclass	Gnathostomata
—	Osteichthyes	()
subclass	Sarcopterygii	()
subclass	Dipnotetrapodomorpha	(Nelson 2006)
subclass	Tetrapodomorpha	()
—	Tetrapoda
—	Reptiliomorpha
—	Anthracosauria
subclass	Amphibiosauria	Kuhn 1967
—	Cotylosauria	()
—	Amniota
—	Sauropsida

Rank	Name	Author
class	Reptilia
subclass	Eureptilia	()
—	Romeriida
—	Diapsida	()
—	Archosauromorpha	(Huene 1946)
—	Crocopoda
—	Archosauriformes	Gauthier 1986
—	Eucrocopoda
—	Archosauria	()
—	Pseudosuchia	(Zittel 1890)
—	Suchia	Krebs 1974
—	Paracrocodylomorpha
—	Loricata	(Merrem 1820)
—	Crocodylomorpha	()
—	Thalattosuchia	()
family	Teleosauridae	Geoffroy 1831
genus	Steneosaurus	Saint-Hilaire 1825
species	heberti	Morel de Glasville 1876

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

†Steneosaurus heberti Morel de Glasville 1876

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Invalid names: Steneosaurus depressus Phizackerley 1951 [synonym], Steneosaurus meretrix Phizackerley 1951 [synonym]

Diagnosis

Reference	Diagnosis
S. E. Pierce et al. 2009	Steneosaurus heberti is a short-snouted teleosaurid that differs from S. bollensis in having relatively short, narrow rostrum; dorsoventrally flattened skull; larger, more longitudinally expanded supratemporal fenestra; large, dorsolaterally oriented orbits; unexpanded premaxilla; preorbital region only slightly wider than rostrum; mandibular symphysis extending almost half the length of mandible; 32–40 teeth on maxilla; 31–36 teeth on mandible and tooth crown slender, conical, striated and generally vertical.