Manometabola see hemimetabolous metamorphosis

mantle n. [L. mantellum, cloak] 1. Something that enfolds, envelopes or covers. 2. (ARTHRO: Crustacea) In thoracic Cirripedia, membranous covering of the body, often strengthened by calcareous plates. 3. (BRACHIO) Prolongation of the body wall as fold of ectodermal epithelium. 4. (BRYO: Phylactolaemata) Ciliated fold of colony wall covering one to four small, sexually produced colony progenitor polypides. 5. (MOLL) A membranous covering that secretes the shell; the marginal glands produce the periostracum; pallium.

mantle canal (brachio) One of several flattened, tube-like extensions of the body cavity into each mantle lobe.

mantle cavity Specialized cavity found in certain mollusks, brachiopods and crustaceans lined with epidermis and usually exposed to sea or fresh water, or air, due to habitat; may or may not contain part of the viscera; pallial chamber or cavity; mantle chamber.

mantle cells (ARTHRO: Insecta) Corneagenous cells of the eye enclosing the retina.

mantle fold (MOLL: Bivalvia) In oysters, one of 3 small folds at the edge of a mantle lobe.

mantle groove (BRACHIO) Site of proliferation of the periostracum and bears the setae.

mantle lobe 1. (brachio) Lobe of the body wall that secretes and lines the valves; in some, cecae project into perforations (punctae) in the shell serving as food repositories of glycoproteins and mucroproteins, inhibitors of boring organisms, and accessory respiratory structures. 2. (MOLL: Bivalvia) In oysters, one of 2 thin epithelial extensions of the mantle adjoining the valve.

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