Acrotheloidea information

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

Acrotheloidea is a superfamily of Discinid brachiopods, alternatively ascribed to the lingulids—for a discussion of discinid taxonomy, see Discinida.

The story goes that there's an evolutionary transition from Eoobolus through Pustulobolus and Bostfordia to Acrotretids.^[2]

Acrotheloids have an apical foramen.^[3]

^ Kazlev, M.Alan. "Palaeos Metazoa: Brachiopoda: Linguliformea: Discinida". palaeos.com.
^ Boyce, W. D.; Balthasar, U.; Knight, I.; Skovsted, C. B. (6 November 2017). "Depth related brachiopod faunas from the lower Cambrian Forteau Formation of southern Labrador and western Newfoundland, Canada". Palaeontologia Electronica: 1–52. doi:10.26879/775. hdl:10026.1/11606.
^ Ushatinskaya, G. T; Korovnikov, I. V (2016). "Revision of the superfamily Acrotheloidea (Brachiopoda, class Linguliformea, order Lingulida) from the Lower and Middle Cambrian of the Siberian Platform". Paleontological Journal. 50 (5): 450–462. Bibcode:2016PalJ...50..450U. doi:10.1134/S0031030116050130.

[1] Kazlev, M.Alan. "Palaeos Metazoa: Brachiopoda: Linguliformea: Discinida". palaeos.com.

[2] Boyce, W. D.; Balthasar, U.; Knight, I.; Skovsted, C. B. (6 November 2017). "Depth related brachiopod faunas from the lower Cambrian Forteau Formation of southern Labrador and western Newfoundland, Canada". Palaeontologia Electronica: 1–52. doi:10.26879/775. hdl:10026.1/11606.

[3] Ushatinskaya, G. T; Korovnikov, I. V (2016). "Revision of the superfamily Acrotheloidea (Brachiopoda, class Linguliformea, order Lingulida) from the Lower and Middle Cambrian of the Siberian Platform". Paleontological Journal. 50 (5): 450–462. Bibcode:2016PalJ...50..450U. doi:10.1134/S0031030116050130.