Aenigmacaris

Aenigmacaris
Aenigmacaris cornigerum SCHRAM & HORNER 1979 from the Mississippian (Serpukhovian) Heath Formation of Bear Gulch, Montana.
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Malacostraca
Order: Aeschronectida
Family: Aenigmacarididae
Genus: Aenigmacaris
Schram and Horner, 1978 

Aenigmacaris is an extinct genus of malacostracan crustacean, which includes the species Aenigmacaris cornigerum and Aenigmacaris minima. Their closest extant relatives are the mantis shrimp.