Genus: Geosaurus CUVIER, 1824
Etymology: Greek, Ge-, 'earth' (in the sense of ground), Greek, sauros, 'lizard': Earth Lizard, as the holotype was found within the limestone of Germany.
= Brachytaenius MEYER, 1842
Etymology:
= Halilimnosaurus RITGEN, 1826
Etymology:
= Ltliminosaurus ROMER, 1966 (sic)

Species: gigantea (SOMMERING, 1816) CUVIER, 1824 sensu QUENSTEDT, 1852
Etymology:
= Lacerta Lacerta gigantea SOMMERING, 1816
= Lacerta Subgenus Geosaurus gigantea (SOMMERING, 1816) CUVIER, 1824
= Geosaurus giganteus just. emend QUENSTDT, 1852
= Mosasaurus giganteus (SOMMERING, 1816) COPE, 1869

Holotype: NHM (BMNH) R 1229

Locality: Daiting, Bayern State, Germany.

Horizon: Mornsheim Formation

Biostratigraphy: hybonotum ammonite zone.

Age: Lower Tithonian Stage, Lower upper Malm Epoch, Late Jurassic.

Material: Incomplete skull, vertebra, ribs, limb bones, teeth and an upper jaw fragment.

Referred material:

NHM (BMNH) R.1230: Postcranial remains preserved in limestone (found with holotype).

ROYAL COLLEGE OF SURGEONS 313: Cast of type skull.

ROYAL COLLEGE OF SURGEONS 314: Cast of the type skeleton.

YOUNG, BRUSATTE, RUTA & DE ANDRADE, 2010

NHM (BMNH) 37016: Isolated tooth crowns.

NHM (BMNH) 37020: Skull preserved in limestone.

 

= Halilimnosaurus crocodiloides RITGEN, 1826
Etymology:

Holotype:

Locality: Daiting, Bayern (Bavaria) State, Germany.

Horizon: Solnhofen.

Biostratigraphy:

Age: Tithonian Stage, Upper Malm Epoch, Late Jurassic.

Material: Vertebrae, girdle elements and limb bones.

 

= Mosasaurus bavaricus HOLL, 1829
Etymology:

Holotype:

Locality:

Horizon:

Biostratigraphy:

Age:

Material:

 

= Brachytaenius perennis MEYER, 1842
Etymology:

Holotype:

Locality: Aalen, Baden-Wurttemberg State, Germany.

Horizon: Brown Jura.

Biostratigraphy:

Age: Early Jurassic.

Material: Teeth.

 

 

= Geosaurus sommeringii MEYER, 1831
Etymology:
= Geosaurus sommeringi just. emend MEYER, 1859

Holotype:

Locality: Kelheim, Donau, North Bayern (Bavaria) State, Germany.

Horizon: Solnhofen.

Biostratigraphy:

Age: Tithonian Stage, Upper Malm Epoch, Late Jurassic.

Material: Vertebral centra and teeth.

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Species: grandis (WAGNER, 1858) ZITTEL, 1887-1890
= Cricosaurus grandis WAGNER, 1858
Etymology: 'Large earth lizard'.
= Metriorhynchus grandis (WAGNER, 1858) LYDEKKER, 1888

Holotype: BSPG AS VI 1

Locality: Daiting, Bayern (Bavaria) State, Germany.

Horizon: Solnhofen.

Biostratigraphy: hybonotum ammonite zone.

Age: Lower Tithonian Stage, Middle Malm Epoch, Late Jurassic.

Material: Complete skull and mandible.
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Species: lapparenti (DEBLEMAS & STRANNOLOUBSKY, 1957) YOUNG & de ANDRADE, 2009
= Dakosaurus lapparenti DEBLEMAS & STRANNOLOUBSKY, 1957
Etymology:

Holotype: UJF-ID.11847

Locality: La Martre, Var Department, France.

Horizon:

Biostratigraphy: peregrinus ammonite zone.

Age: Upper Valanginian Stage, Middle Neocomian Subepoch, Lower Early Cretaceous Epoch, Early Cretaceous.

Material: Skull fragments, 2 isolated teeth, 3 cervical vertebrae, 6 caudals, 2 portions of scapulae, an incomplete metatarsal, broken ribs, etc.
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Species: carpenteri (WILKINSON, YOUNG & BENTON, 2008) YOUNG & de ANDRADE, 2009
= Dakosaurus carpenteri WILKINSON, YOUNG & BENTON, 2008
Etymology: In honor of Mr. Simon Carpenter, who discovered the holotype and subsequent postcranial material, yieldong 'Carpenter's earth lizard'.

Holotype: BRSMG Ce1765

Locality: Westbury, Wiltshire County, England, Southern United Kingdom.

Horizon: Kimmeridge Clay Formation.

Biostratigraphy: Upper mutabilis to upper eucoxus zones.

Age: Upper Kimmeridgian Stage, Middle Malm Epoch, Late Jurassic.

Material: An incomplete skull that consists of maxilla, parietal premaxilla, prefrontals, frontals, pairetal, nasal, postorbital and squamosal.

Paratype:

BRSMG Cd7203: Mandibular fragments, 36 vertebrae including 5 cervicals, 12 dorsals, 1 sacral and 8 caudal vertebrae, ribs, including 3 cervical and approximately 12 dorsals, humerus, possible propodial and metacarpal, left sichium, left and right femora.