Free shipping! Thalattosauridae is a family of extinct prehistoric marine reptiles that lived exclusively during the Triassic Period (roughly 252 to 201 million years ago). This fossil has been cleaned 3D, and the bones are very distinct from the matrix. Its eyes, fin and body are quite beautiful, and many details are still there. The white line is quartz line. The size of the body is 90 cm. Body Shape: Slender, elongated bodies with long, laterally flattened tails adapted for efficient swimming. Habitat: Fully marine reptiles that primarily inhabited shallow coastal waters. Diet: Equipped with specialized teeth and jaws suited for crushing shelled invertebrates like mollusks.