1) Burgess Shale fossil 
Dinocaridida is a proposed extinct taxon of fossil arthropod-like marine animals found, with one exception, in the Cambrian and Ordovician. It is subdivided into the anomalocaridids and the opabinids. The name of this group comes from Greek, `deinos` and `caris`, meaning `terror shrimp` or `terror crab`, due to their crustacean-like appear...