Homalozoa

Homalozoa
Reconstructions of various homalozoans in life position. From the left to the right of each row and from top to bottom:

Coleicarpus (a solute), Chinianocarpus (a mitrate), Ceratocystis (a basal stylophoran), Trochocystites (a cinctan), and Courtessolea (a ctenocystoid)

Scientific classification
Kingdom: Animalia
Phylum: Echinodermata
Subphylum: Homalozoa
Whitehouse, 1941
Groups included

Homalozoa is an obsolete extinct subphylum of Paleozoic era echinoderms, prehistoric marine invertebrates. They are also referred to as carpoids.