Belongs within: Eumetazoa.Contains: Sipunculida. The Sipuncula, peanut worms, are a group of marine worms with a retractile proboscis (Howell 1962). Though often treated as a distinct ‘phylum’ within the animals, recent analyses have suggested that they may be derived annelids that have secondarily lost segmentation. Characters (from Howell 1962): Body unsegmented or poorly segmented, cylindrical… Continue reading Sipuncula

Categorised as Sipuncula