Species: leptognathus OWEN, 1842
Etymology:
= Cyclotosaurus leptognathus (OWEN, 1842) PATON, 1974
= Stenotosaurus leptognathus (OWEN, 1842) SHISHKIN, 1980
= Wellesaurus leptognathus (OWEN, 1842) HEYLER, 1976
= Mastodonsaurus leptognathus (OWEN, 1842) KUHN, 1933

Lectotype: Warwick Museum GZ 38

Locality: Coten End Quarry and Bromsgrove, SW of Birmingham, Warwickshire County, England, Southern United Kingdom.

Horizon: Upper Bromsgrove Sandstone Formation.

Biostratigraphy:

Age: Anisian Stage, Lower Mid Triassic Epoch, Middle Triassic.

Material: Fragment of snout from the posterior edge of the anterior palatal vacity to about the level of the anterior edge of the interpterygoid vacuities.

Paralectotypes:

Gz 11: Parts of mandibular rami.

Referred material:

HUENE, 1908

Locality: Warwick, Warwickshire County, England, Southern United Kingdom.

Horizon: Lower Keuper.

Biostratigraphy:

Age: Late Triassic.

Material:

Number: Not given.

= Labyrinthodon leptognathus WILLIS, 1915

Locality: England, Southern United Kingdom.

Horizon:

Biostratigraphy:

Age: Late Triassic

Material:

GZ 27: 2 small pieces of lower jaws, one the anterior part and the other a central part with a portion of the coronid series.

BSp 3: The anterior end of a left lower jaw.

Referred material:

WOODWARD

Locality: Cubbington Heath, Leamington, England, Southern United Kingdom.

Horizon: Lower Keuper.

Biostratigraphy:

Age: Late Triassic.

Material:

BMNH R3493: Fragmentary mandible.