gastric mill
A food grinding apparatus in the foregut of decapod crustaceans; in penaeid shrimps, consists of denticles (tooth-like processes) and lateral ridges in wall of anterior chamber; in crayfishes, lobsters, and crabs, consists of one dorsal and two lateral teeth at junction of anterior and posterior chambers [Bliss, 1982].
Apparatus of varying complexity in stomodeum which serves to break up food; consists of framework of movably articulated ossicles developed as thickened and calcified part of stomodeal lining, most highly specialized in decapods [Moore and McCormick, 1969].
Heavily sclerotized teeth of the cardiac stomach of most decapods [Brusca and Brusca, 2002].
The structures responsible for grinding food within the stomach (Fig. 10) [Warner, 1977].
(Order Decapoda):
Grinding apparatus in posterior region of cardiac stomach. If fully developed, consists of muscular stomach walls bearing plates (ossicles), projecting teeth, and various pads and folds [Stachowitsch, 1992].
(Subclass Cirripedia):
Apparatus in cardiac stomach (stomodeum) with framework of movably articulated ossicles developed as thickened and calcified parts of stomodeal lining used to break up food, most highly specialized in decapods; also chitinous triturating apparatus in foregut of some acrothoracicans [McLaughlin, 1980].
(Class Ostracoda):
In certain ostracods, term occasionally applied to lamellar respiratory process located dorsally on trunk [Stachowitsch, 1992].

Crustacea glossary. . 2011.

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