The polypide in bryozoans encompasses most of the organs and tissues of each individual zooid. Reproduction in "Cothurnia" begins with the macronucleus taking a transverse position in the zooid. These spines make it difficult for the nudibranchs to access the polypide of the zooid. He is a member of Henry Threadgill's ensemble, Zooid. When this sperm is drawn into another individual zooid, internal fertilisation can occur. Sexual reproduction starts within a zooid with an internally fertilized egg. The terminal zooid cells will elongate and divide. Each individual zooid has a plump, urn-shaped body with a diameter of up to . Subsequent zooid replication can lead to coalescence and circulatory fusion of the subcolonies.