Chelonioidea

Cheloniidae
Dermochelyidae
Euclastes
loggerhead turtle Caretta caretta
Photo: Jean-Lou Justine · (c) Jean-Lou Justine, some rights reserved (CC BY) · CC BY 4.0
A genome study reported about 2.13 billion base pairs in the loggerhead sea turtle assembly.
Green turtle Chelonia mydas
Photo: Brocken Inaglory · CC BY-SA 4.0
A sea turtle with a small head and hard shell. Adults feed mainly on seagrasses and algae.