trophamnion

From ZooTerms (Dictionary of Invertebrate Zoology)
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trophamnion (noun; Greek trophe, food; amnion, membrane around the fetus): (Arthropoda: Insecta) An envelope surrounding the embryonic mass in the polyembryonic ova of mainly parasitic Hymenoptera, formed by cytoplasm in the egg associated with the paranuclear mass, and functioning in relaying nutrients from the host.