| Acastoidea Temporal range:
| |
|---|---|
| |
| Walliserops trifurcatus | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | †Trilobita |
| Order: | †Phacopida |
| Suborder: | †Phacopina |
| Superfamily: | †Acastoidea Reijers, 1972 |
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. Acastoidea was first proposed by T.J.A. Reijers in 1972.[2]
- ^ S. M. Gon III. "Order Phacopida". Archived from the original on 6 January 2011. Retrieved December 4, 2010.
- ^ Reijers, T.J.A. (1972). "Facies and diagenesis of the Devonian Portilla Limestone Formation between the River Esla and the embalse de la Luna, Cantabrian Mountains, Spain". Leidse Geologische Mededelingen. 47 (2): 163–249.