Stratesaurus

Genus

Stratesaurus

Author

Benson, Evans and Druckenmiller (2012)

Classification

Stratesaurus

Age

Early Jurassic (Early Hettangian)

Location

Somerset, UK

Type species

Other species

None

Referred material

None

Stratesaurus is a very small-bodied basal plesiosaur known from the lowermost Jurassic (Blue Lias Formation) of Street, Somerset .

Stratesaurus is represented by three specimens. The holotype specimen (OUMNH J.10337) was named and briefly described by Benson, Evans and Druckenmiller (2012), and later described in detail along with two referred specimens by Benson, Evans, and Taylor (2015).

The genus contains a single species, Stratesaurus taylori. The genus name comes from ‘Strate’, the name for Street as recorded in the Doomesday Book. The species name honours palaeontologist Michael A. Taylor, who conducted preparation on the specimen, and was involved in its description (but not in its naming!).

Stratesaurus possesses the following diagnostic characters:

Very small adult body size (the skull is 18cm long, so I would estimate the total body length at about 2m)

Five alveoli in each premaxilla

19–21 alveoli in each maxilla

Maxilla lacks rostral constriction

Prominent and posteriorly projecting processes on posterolateral surfaces of anterior cervical prezyga pophyses (autapomorphy)

Pectoral centra proportionally short (a length:anterior height ratio of 0.7) (autapomorphy) 

Stratesaurus taylori

Species

S. taylori

Author

Benson, Evans and Druckenmiller (2012)

Classification



S. taylori

Age

Lower Hettangian

Type location

Street, Somerset, UK

Type specimen

OUMNH J.10337, skull and partial postcranium

Referred material

AGT 11, a skull; GSM 26035, a skull

S. taylori is the type and only species of Stratesaurus.