Acrotheloidea is a superfamily of Discinid

brachiopod Brachiopods (), phylum Brachiopoda, are a phylum of trochozoan animals that have hard "valves" (shells) on the upper and lower surfaces, unlike the left and right arrangement in bivalve molluscs. Brachiopod valves are hinged at the rear end, w ...

s, alternatively ascribed to the lingulids—for a discussion of discinid taxonomy, see

Discinida Discinida is an order of brachiopods comprising the extant superfamily Discinoidea, and the extinct superfamilies Botsfordioidea (early—mid-Cambrian) and Acrotheloidea (early Cambrian–Early Ordovician). It represents a sister taxon to the ...

. The story goes that there's an evolutionary transition from Eoobolus through Pustulobolus and Bostfordia to Acrotretids. Acrotheloids have an apical foramen.

References

Prehistoric animal superfamilies Discinida {{paleo-protostome-stub