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“plantospheroidea”
Hemichordata that are only known as planktonic larva: Plantospheroidea are very simple and underdeveloped worm-like animals that are in the form of transparent ciliated spheres.
This entry is located in the following units:
plankto-, plankt-, -plankton
(page 6)
sphero-, spher-, -sphere-
(page 11)