A member or characteristic of the family Cheloniidae, specifically referring to sea turtles and related marine chelonians.
An alternate spelling variant of 'chelonid,' using the suffix '-iid' instead of '-id,' both derived from the family name Cheloniidae in scientific nomenclature.
The distinction between different turtle family names (Cheloniidae versus Testudinidae) reflects millions of years of evolution, with sea turtles developing flippers while land tortoises kept sturdy legs.
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