Definition of Orthonectida
: an order or other division of Mesozoa comprising a number of rare parasites of the tissues and cavities of various invertebrates that alternate between an asexual plasmodial generation and a sexual generation resembling the nematogens of dicyemids but having numerous internal cells — compare dicyemida
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Origin and Etymology of orthonectida
New Latin, from orth- + nect- + -ida
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