Plesiosauria indet

O’Gorman, José Patricio & Otero, Rodrigo A., 2023, Revision of the short-necked Cretaceous plesiosaurians from New Zealand, Comptes Rendus Palevol 22 (6), pp. 77-90 : 83

Plesiosauria indet .

MATERIAL. — NHMUK 37413 , impression of six posterior cervical centra and four ribs .

LOCALITY AND HORIZON. — Probably Waipara river or Bobys Stream ( Fig. 1).

REMARKS

Welles & Gregg (1971) mentioned that the matrix is similar to that observed in NHMUK 36073 and NHMUK 36075, also calculating the BI index of the last centra as 202. The vertebral measurements are remarkably similar (40 mm) in both specimens. Considering these indices and their associated collection, these likely belong to the same individual. The specimen is compatible with the morphology observed in Elasmosauridae ; however, no clear synapomorphies of the later clade are observed and therefore, they are referred here to Plesiosauria indet.