1) Transitional fossil
Found on
https://www.crosswordclues.com/clue/heteronectes
Heteronectes chaneti is a fossil fish which has been identified as an early relative of the flatfish, and as a transitional fossil. In a typical modern flatfish, the head is asymmetric with both eyes on one side of the head. In Heteronectes, the transition from the typical symmetric head of a vertebrate is incomplete, with one eye positioned near ...
Found on
http://en.wikipedia.org/wiki/Heteronectes
No exact match found.
