Acrotheloidea is a superfamily of Discinid brachiopods, 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