With a mesosomal bridle.
Source: Knight-Jones and Ryland, 1990.
The following taxa of this class occur in the region:
Order Athecanephrida
Order Thecanephrida
Family Sclerolinidae
Family Siboglinidae
Genus Sclerolinum
Genus Siboglinum
Siboglinum ekmani
Siboglinum fiordicum
Siboglinum norvegicum
Sclerolinum brattstromi