Sipunculidea is a class of marine peanut worms. The tentacles form a circle around the mouth whereas those of the sister taxon, Phascolosomatidea, are only found above the mouth. Most species burrow in the substrate but some live in the empty shells of gastropods.
The traditional classification is thus:
- Invertebrate Anatomy OnLine Archived 2011-04-01 at the Wayback Machine.
- Müller, C. H. G., J. Hylleberg, and P. Michalik. 2015. Complex epidermal organs of Phascolion (Sipuncula): Insights into the evolution of bimodal secretory cells in annelids. Acta Zoologica, 96:343–374.
- Kawauchi, G. Y., P. P. Sharma, and G. Giribet. 2012. Sipunculan phylogeny based on six genes, with a new classification and the descriptions of two new families. Zoologica Scripta, 41:186–210.
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