Large plesiosauroid probably around 5 m in length distinguished by the following combination of features. Small needle-like teeth that are distinctly ovoid (labiolingually compressed) in cross-section and lack any surface ornamentation. Cervical centra with length less than height; platycoelous articular surfaces markedly ovate (ventral groove absent) and bearing prominent central mammillae surrounding the notochordal pit. Lateral sur faces of cervical centra lack any trace of a lateral longitudinal ridge but bear prominent facets for the single-headed cervical ribs. Longitudinal pectoral bar poorly preserved but apparently formed by scapula and coracoid only. Coracoids unite medially along their entire length (intercoracoid embayment absent) and bear prominent posterior coruna. Humerus massive with slender shaft and marked distal expansion. Supernumerary ossifications present in the epipodial row along the anterior margin of the carpus.

Combination of the type locality name Andamooka and the suffix -ensis (Latin: of or from), referring to derivation of the holotype specimen from near the opal-mining township of Andamooka.