Dicyemida


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Dicyemida

[‚dī‚sī′em·ə·də]
(invertebrate zoology)
An order of mesozoans comprising minute, wormlike parasites of the renal organs of cephalopod mollusks.
References in periodicals archive ?
Invertebrate zoologists consider the phyla Dicyemida, Orthonectida, Placozoa, Cycliophora, Entoprocta (Kamptozoa), Chaetognatha, Pterobranchia, and Enteropneusta along with the order Seisonidae.
Owing to their simple body plan, orthonectids were grouped together with Dicyemida, microscopic parasites found in ceph-alopods, in a clade called Mesozoa, a sister group to Metazoa.
A classic example is the question of monophyly of the Mesozoa, specifically with respect to the parasitic phyla Orthonectida and Dicyemida. This question is aggravated by a well-known and yet still unsolved problem of long branch attraction.
All members of the phylum Dicyemida are found in the renal sacs of benthic cephalopod molluscs (Nouvel, 1947; McConnaughey, 1951; Hochberg, 1990).