Homalozoa

Homalozoa
Cothurnocystis,
Paleozoic era.
Scientific classification
Domain: Eukaryota
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.