1) Burgess Shale fossil
Found on
https://www.crosswordclues.com/clue/hymenocaris
Hymenocaris is a genus of Cambrian crustaceans. Some species originally assigned to Hymenocaris were later transferred to Canadaspis, such as Canadaspis perfecta (Hymenocaris perfecta), leaving only Hymenocaris vermicauda. Differences between Hymenocaris and Canadaspis have been used to justify erecting a separate family, Hymenocarididae and order...
Found on
http://en.wikipedia.org/wiki/Hymenocaris
No exact match found.
