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    (jĭm´nô`sō´må`tå or jĭm´nô`sǒm´å`tå)
n. pl.1.(Zool.) One of the orders of Pteropoda. They have no shell.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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References in periodicals archive ?
Reproduction and development of Paedoclione doliiformis, and a comparison with Clione limacine (Opisthobranchia: Gymnosomata).
Ecological role for pteroenone, a novel antifeedant from the conspicuous antarctic pteropod Clione antarctica (Gymnosomata: Gastropoda).
Se identificaron los siguientes grupos del holozooplancton: radiolarios (Clase Radiolaria), foraminiferos (Orden Foraminifera), sifonoforos (Orden Siphonophora), medusas (Clase Hydrozoa excepto sifonoforos), clenoforos (Phylum Ctenophora), tecosornados (Orden Thecosomata), gimnosomados (Orden Gymnosomata), heteropodos (Suborden Heteropoda), poliquetos (Clase Polychaeta), cladoceros (Orden Cladocera), ostracodos (Subclase Ostracoda), copepodos (Subclase Copepoda), misidaceos (Orden Mysidacea), anfipodos (Orden Amphipoda), eufausidos (Orden Euphausiacea), decapodos pelagicos (Orden Decapoda), quetognatos (Phyllum Chaetognata), apendicularias (Orden Appendicularia) y tunicados (Clase Thaliacea).
Incluyen los ordenes Thecosomata y Gymnosomata (Lalli & Gilmer, 1989).
The Thecosomata and Gymnosomata of the Siboga-Expedition.
In other opisthobranch orders, the retractor muscles are severed and the shell cast off at metamorphosis (e.g., Ascoglossa, Nudibranchia, Gymnosomata).