Large cryptoclidid plesiosauroid differing from described cryptoclidids in the following features: jugal bar exceptionally deep; jugal apparently large and subtriangular; lack of cheek bar excavation; orbit anteriorly placed; postorbital region relatively long; tooth count of premaxilla 7, maxilla 36+. dentary 42+; cervical vertebral count 43; anterior cervical centra widened and bilobed in anterior view, with lobes separated by ventral notch. Differs from Trideidus in lack of cheek bar excavation; deep cheek bar; increased number of premaxillary and maxillary teeth; highly regular teeth with reduced ornament; increased number of cervical vertebrae; large body size. Further, differs from Morturneria and Aristonectes in having fewer teeth; from Morturneria in apparently lacking extremely long pineal opening and lacking far forward development of parietals; and from Aristonectes in shallower excavation of lower margin of cheek bar, and fewer premaxillary and dentary teeth.

After Katiki Beach, which lies immediately to the north of Shag Point. Regarded as indeclinable.