Acrotretoidea Explained

Acrotretoidea is a superfamily of brachiopods containing the following families:

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Family Number of genera Fossil range
Acrotretidae55 Lower Cambrian – Silurian
Curticiidae 1 Middle – Upper Cambrian
Torynelasmatidae9Ordovician (Arenig) – Silurian
Eoconulidae 3 Ordovician (Arenig – Ashgill)
Ceratretidae 8Lower – Upper Cambrian
Ephippelasmatidae 12Upper Cambrian – Ordovician
Scaphelasmatidae 6Middle Cambrian - Upper Silurian
Biernatidae 5Lower Ordovician – Middle Devonian