n. pl. [OF. escale, husk]
1. A small, more or less flattened, plate-like exterior covering.
a. In Chelicerata, flattened, modified setae of Arachnida. b. In Crustacea, small calcareous plate on the peduncle of lepadomorph barnacles; see scaphocerite. c. In Insecta, flat unicellular outgrowths of the body-wall; highly modified clothing hairs of all Lepidoptera, many Collembola, in some Thysanura, Coleoptera, Diptera and Hymenoptera.
a. In Bivalvia, localized projections of the outer shell; usually on a rib. b. In Polyplacophora, small calcareous bodies decorating the dorsal side of the girdle, sometimes closely set, overlapping and of various shapes, being smooth or with minute striations.
4. (NEMATODA: Sacernentea)
Thickened, retrorse modifications of the body annuli.

Online Dictionary of Invertebrate Zoology. . 2005.

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