(From: Berg, G., & Gibson R. (1996). A redescription of Nemertoscolex parasiticus Greeff, 1879, an apparently endoparasitic heteronemertean from the coelomic fluid of the echiuroid Echiurus echiurus (Pallas).. Journal of Natural History. 163-173)
The genus, which is monotypic, was never formally defined by Greeff; the diagnosis given here is thus based upon the present studies.
Heteronemertea with a single pair of lateral horizontal cephalic furrows; proboscis unbranched, with weakly developed outer circular and inner longitudinal muscle layers but no muscle crosses; rhynchocoel circular musculature not interwoven with adjacent body wall inner longitudinal muscle fibres; dorsal fibrous core of cerebral ganglia both anteriorly and posteriorly unbranched; nervous system with neither neurochords nor neurochord cells; foregut with neither somatic muscles nor subepithelial gland cell zone; dermal glands distributed between fibres of body wall outer longitudinal muscle layer, without connective tissue stratum; caudal cirrus absent; blood system with two cephalic lacunae, foregut vascular plexus and three longitudinal vessels in intestinal region which are not linked by pseudometameric transverse connectives; excretory system present, opening by one pair of nephridiopores; apical organ missing, cephalic glands present; connective tissues of body sparingly developed; eyes absent; inhabits coelomic fluid of echiuroids, most probably as an endoparasite.
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