Acastoidea is a superfamily of trilobites from the order Phacopida, suborder Phacopina.

This superfamily is divided into two families, Acastidae and Calmoniidae.

[1] This superfamily is distinguishable from the Phacopidae in that eyes are closer to the glabella and that the glabella has lobes, unlike the genera in Phacopidae.

[2] This Phacopida-related article is a stub.

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