- mesostom
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n. [Gr. mesos, middle; stoma, mouth](NEMATA)A division of the protostome preceded anteriorly by the prostome and posteriorly by the metastome; see prostome.
Online Dictionary of Invertebrate Zoology. A.R. Maggenti and S.L. Gardne. 2005.
mesostom
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mesostome — См. mesostom … Dictionary of invertebrate zoology
