Phylum: Mollusca

Class: Gastropoda

Subclass: Prosobranchia

Order: Archaeogastropoda

Suborder: Vetigastropoda

 

Norwegian: kjeglesnegler

(Bjorøy - Hordaland / 25 meters / 4.11.2002)

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The prefix arch reflects the fact that these snails have a history all the way back to the late Cambrian age.

They often have paired gills, but some have only one or the gills may be completely absent. In latter cases respiration is achieved by a set of secondary, pallial (external) gills. The shell is conical or coiled.