👉 Plectropterinae is a group of extinct, but now extant marine mammal orders that lived during the Early Cretaceous period (about 79 million years ago). These creatures are characterized by their long, slender bodies and large, flat tails, which were used for swimming. The plesiosaur class, which includes Plectropterinae, is a group of marine reptiles that evolved from prehistoric sea animals and lived during the Late Cretaceous period
