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Related to pseudocoel: acoelomate
pseu·do·coel(so͞o′də-sēl′) also pseu·do·coe·lom (so͞o′də-sē′ləm)
The fluid-filled body cavity of certain invertebrates, such as nematodes and rotifers, that is derived from the blastocoel and, unlike a coelom, is not completely lined with mesodermal cells.
(Zoology) (in certain primitive invertebrates) a body cavity resembling a coelom, but lacking mesodermal cell tissue