Pseudocoelomata

plural noun
Pseu·​do·​coelomata | \¦sü(ˌ)dō+\

Definition of Pseudocoelomata 

in some classifications

: a group comprising lower invertebrates in which there is a body cavity that either lacks a mesodermal lining or has one derived from wandering mesenchymal cells, including rotifers, nematodes, bryozoans, and related forms, and being basically equivalent to Aschelminthes

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History and Etymology for Pseudocoelomata

New Latin, from pseud- + Coelomata

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