Acrotheloidea

Acrotheloidea is an extinct superfamily of discinid brachiopods, that lived from the Early Cambrian to Early Ordovician periods, c. 538 – 471 Ma. They are sometimes alternatively ascribed to the lingulids.

Acrotheloidea Temporal range: Cambrian Stage 2–Early Ordovician[1] PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Brachiopoda
Order:	Discinida
Superfamily:	†Acrotheloidea
Families
Acrothelidae Botsfordiidae Schindewolf, 1955

There is evidence for an evolutionary transition through the genera Eoobolus, Pustulobolus, and Bostfordia to the Acrotretids.^[2] Acrotheloids have an apical foramen.^[3]