Acrotheloidea Explained

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.^[1]

Acrotheloids have an apical foramen.^[2]

Notes and References

1. Boyce . W. D. . Balthasar . U. . Knight . I. . Skovsted . C. B. . Depth related brachiopod faunas from the lower Cambrian Forteau Formation of southern Labrador and western Newfoundland, Canada . Palaeontologia Electronica . 1–52 . English . 10.26879/775 . 6 November 2017. 10026.1/11606 . free .
2. 10.1134/S0031030116050130. 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. 2016. Ushatinskaya. G. T. Korovnikov. I. V. 2016PalJ...50..450U .