Acrotheloidea

Acrotheloidea; Temporal range:
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]

References

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. pp. 1–52. doi:10.26879/775.
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. doi:10.1134/S0031030116050130.

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[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. pp. 1–52. doi:10.26879/775.

[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. doi:10.1134/S0031030116050130.