Molaria steini Peel, 2017 Molaria is a genus of Cambrian arthropod, the type species M. spinifera is known from the Middle Cambrian Burgess Shale.

144 specimens of Molaria are known from the Greater Phyllopod bed, where they comprise 0.27% of the community.

The specific name of the type species, spinifera, comes from Latin spinifer “spine-bearing.”[4] The body of Molaria consisted of a head shield (cephalon), a trunk consisting of eight sections (tergites), and a telson, which included a short ventral spine and a long posterior spine.

Eyes were lacking, but a pair of short antennae was present on the cephalon.

[5] Molaria was superficially similar to Habelia, another Burgess Shale arthropod with a long tail spine, but which possessed 12 trunk tergites.