Genus: Tylosaurus MARSH, 1872

Species: kansasensis EVERHART, 2005

Holotype: FHSM VP-2295

Locality: 8 miles northeast of the town of Ellis, Ellis County, Kansas.

Horizon: Lower Smoky Hill Chalk Member, Niobrara Formation.

Biostratigraphy:

Age: Late Coniacian Stage, lowest Senonian subepoch, lower Gulf Epoch, Early Late Cretaceous.

Material: A complete articulated skull wiht 7 cervical vertebrae.

Note: The frontal and right dentary have several long, deep gouges and punctures that see to be unhealed bit marks from an fatal encounter with a larger mosasaur (EVERHART, 2005, 2008).

Referred material:

Locality: Gove County, Kansas.

Horizon: Lower Smoky Hill Chalk Member, Niobrara Formation.

Biostratigraphy:

Age: Late Coniacian Stage, lowest Senonian subepoch, lower Gulf Epoch, Early Late Cretaceous.

Material:

FHSM VP-3366: Partial skull, including premaxilla and a right quadrate, 24 cervical and dorsal vertebrae, rib fragments and preserved thoracic cartilage.
Note: Pathologic, 1 rib has a healed fracture.
Note: Serrated bite marks are on the skeletal remains from Squalicorax falcatus.