Longitudinal muscle fibers of body wall lie between layers of outer circular and inner oblique muscle-fibers. Blood-vessels present. Dwarf males parasitic on the females.
Sorry, there are no scientific synonyms and common names available for this taxon
Knight-Jones, E.W. & J.S. Ryland, 1990. Priapulida, Sipuncula, Echiura, Pogonophora, and Entoprocta. In: The Marine Fauna of the British Isles and North-West Europe. (ed. P.J. Hayward & J.S. Ryland). Clarendon Press, Oxford.
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