
The Sipuncula or Sipunculida is a group containing about 162 species of bilaterally symmetrical, unsegmented marine worms. The name Sipuncula is from the genus name Sipunculus, and comes from the Latin siphunculus meaning a "small tube". Sipuncula seems to be closely related to Myzostomida, and Annelida.

Aspidosiphon muelleri is a species of unsegmented benthic marine worm in the phylum Sipuncula, the peanut worms. This worm is found in the eastern Atlantic Ocean, the Mediterranean Sea and in various locations in the Indo-Pacific region at depths down to about 1,000 m (3,300 ft).

Golfingiida is an order of 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. It is the only order in the monotypic class Sipunculidea and contains the following families:Golfingiidae Phascolionidae Sipunculidae Rafinesque, 1814 Themistidae

Golfingiidae is a family of peanut worms.

Lecthaylus is a genus of fossil sipunculid worms that lived between the Cambrian and the Lower Carboniferous periods.

Phascolosomatidae is a family of peanut worms. It is the only family in the order Phascolosomatida, which is in the class Phascolosomatidea.

Phascolosomatidea is a class of peanut worms containing two orders:-Aspidosiphonida containing the single family Aspidosiphonidae Phascolosomatida containing the single family Phascolosomatidae

Phascolosomatidae is a family of peanut worms. It is the only family in the order Phascolosomatida, which is in the class Phascolosomatidea.

Sipunculidae is a family of peanut worms.

Golfingiida is an order of 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. It is the only order in the monotypic class Sipunculidea and contains the following families:Golfingiidae Phascolionidae Sipunculidae Rafinesque, 1814 Themistidae

Sipunculidae is a family of peanut worms.

Sipunculus nudus is a cosmopolitan species of unsegmented marine worm of the phylum Sipuncula, also known as peanut worms.

Sipunculus robustus is a species of unsegmented benthic marine worm in the phylum Sipuncula, the peanut worms.

Themiste is a genus of peanut worms. It is the only genus in the family Themistidae.

Themiste pyroides is a species of unsegmented benthic marine worm in the phylum Sipuncula, the peanut worms. It occurs in the intertidal zone and shallow water in the western Atlantic Ocean and the northeastern Pacific Ocean. It lives in crevices and under rocks, extending its "crown" of branching tentacles into the surrounding water to feed.

Themiste is a genus of peanut worms. It is the only genus in the family Themistidae.