Excretory portions of anterior coelomoducts widely separated, each adjoining a lateral cephalic blood-vessel. Spermatophores spindle-shaped.
Source: Knight-Jones and Ryland, 1990.
The following taxa of this order occur in the region:
Family Siboglinidae
Genus Siboglinum
Siboglinum ekmani
Siboglinum fiordicum
Siboglinum norvegicum