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Segmented Worms

Annelida

Classification

provided by World Register of Marine Species
In recent molecular studies it is clear that several groups formerly placed outside Annelida phylum actually belong in annelids. One of these are the Orthonectida, vermiform endoparasites of various marine animals that have been linked in the Mesozoa. Schiffer et al (2018) found that the orthonectid genus Intoshia is a member of the Annelida, but perhaps lies outside of the Pleistoannelida. In WoRMS orthonectids are currently a stand-alone phylum.

Reference

Schiffer, Philipp H.; Robertson, Helen E.; Telford, Maximilian J. (2018). Orthonectids Are Highly Degenerate Annelid Worms. Current Biology. 28(12): 1970-1974.e3.

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WoRMS Editorial Board
bibliographic citation
Schiffer, Philipp H.; Robertson, Helen E.; Telford, Maximilian J. (2018). Orthonectids Are Highly Degenerate Annelid Worms. <em>Current Biology.</em> 28(12): 1970-1974.e3. VLIZ Belgian Marine Species Consortium
contributor
Read, Geoffrey, G.B.