Tentacles all lie dorsal to the mouth, forming a horseshoe round the nuchal organ. Spindle muscle attached to the body wall posteriorly.
Source: Knight-Jones and Ryland, 1990.
The following taxa of this class occur in the region:
Order Aspidosiphonida
Family Aspidosiphonidae
Genus Aspidosiphon
Order Phascolosomatida
Family Phascolosomatidae
Genus Phascolosoma
Aspidosiphon muelleri
Phascolosoma granulatum