Adult specimen LACM 129639 contains a large conspecific fetus, directly supporting viviparity in this Late Cretaceous plesiosaur.
Represented range78–78 Ma
RegionsPierre Shale, Kansas, United States
CladesPolycotylus latipinnus · Plesiosauria
Claim ledger
ecology · high
Adult Polycotylus specimen LACM 129639 contains a large articulated conspecific fetus and therefore supports viviparity; maternal care, sociality and a K-selected life history are not directly preserved behaviours.