Gephyrea

Gephyrea is a now-dismantled taxon for a group of non-annulated worms, considered intermediate between annelids and holothurians, containing the three modern phyla Echiura, Sipuncula, and Priapulida.[1]

References
  1. Banta, W.C.; Rice, M.E. (1970). "A restudy of the Middle Cambrian Burgess Shale fossil worm, Ottoia prolifica" (PDF). Proceedings of the International Symposium on the Biology of the Sipunculata and Echiura. 11.
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