Primicaris is genus of Cambrian arthropod from the Chengjiang biota of China and the Burgess Shale of Canada.

The undivided subovate-shaped dorsal shield covered the entire body, and wrapped around the front edge of the carapace, forming a doublure structure.

The midline of the carapace exhibited thickening.

[1] Its specimens were once thought to be meraspids of Naraoia spinosa.

[1] Although their phylogenetic position has been described as "problematic",[2] recent studies have suggested them to be marrellomorphs belonging to the subgroup Acercostraca.