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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

Class Phascolosomatidea