mantle lobe

From ZooTerms (Dictionary of Invertebrate Zoology)
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mantle lobe: 1. (Brachiopoda) 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. (Mollusca: Bivalvia) In oysters, one of 2 thin epithelial extensions of the mantle adjoining the valve.