Scalpellum see lancet

scalpriform a. [L. scalprum, chisel; forma, shape] Chisel-shaped.

scanning electron microscope (SEM) A microscope with an electron beam that scans the specimen producing an image of the surface on a florescent screen.

scansorial a. [L. scandere, to climb] Adapted for climbing or clinging.

scape, scapus n. [L. scapus, shaft] 1. A stem or shaft. 2. (ar-THRO: Chelicerata) A structure associated with the epi-gynum of some female Arachnida, partially covering the vulva. 3. (ARTHRO: Insecta) The first or basal segment of an antenna; in Diptera, the two basal segments of the antenna. 4. (CNID: Anthozoa) a. In Alcyonaria, the main stem of Pennatulacea. b. In Actinaria, the lower thick-walled region of the column.

scaphe n. [Gr. skaphe, boat] (ANN: Polychaeta) In Amphicteni-dae, a flattened caudal appendage bearing the anus.

scaphiform, scaphoid a. [Gr. skaphe, boat] Boat-shaped.

scaphium n. [Gr. skaphe, boat] 1. A boat-shaped structure. 2. (ARTHRO: Insecta) In male Lepidoptera, a dorsal sclerotiza-tion of the genitalia, below the uncus, and above the anus. see subscaphium.

scaphocerite n. [Gr. skaphe, boat; keras, horn] (ARTHRO: Crustacea) The flattened exopod of the antenna; a scale; a squama.

scaphognathite n. [Gr. skaphe, boat; ganthos, jaw] (ARTHRO: Crustacea) In Decapoda, the exopod of the maxilla, often used to produce the respiratory current in the gill chamber; bailer or gill bailer.

Scaphopoda n. [Gr. skaphe, boat; pous, foot] A class of Mol-lusca containing the tusk or tooth shell that are bilaterally symmetrical with an elongate, gently curved, tubular shell open at both ends; an exclusively marine dweller.

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