Orthonectida
plural noun
Or·tho·nec·ti·da
: 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
Word History
Etymology
New Latin, from orth- + nect- + -ida