Spiracular plate see peritreme

spiracular processes (ARTHRO: Insecta) In some Scara-baeoidea, dendriform trabeculae that form the filter apparatus.

spiracular sclerite (ARTHRO: Insecta) In Diptera, a sclerite of the metapleuron below the metathoracic spiracle.

spiracular setae (ARTHRO: Insecta) In Coccoidea, setae of various shapes and sizes terminating each spiracular pore band.

spiracular sieve plate (ARTHRO: Insecta) A platelike sclerite covering the spiracle that functions to exclude entry of dust or water into the tracheal system.

spiracular spines (ARTHRO: Insecta) In Coccoidea, large seta usually associated with each spiracular pore cluster.

spiraculate a. [L. spirare, to breathe] With spiracles.

spiraculiform a. [L. spirare, to breathe; forma, shape] Spira cle-shaped.

spiral n. [L. spira, coil] A curved line or surface extending outward with continuously increasing radius of curvature.

spiral amphid (nemata: Adenophorea) A coiled amphid tube beneath the cuticle that appears as a spiral.

spiral cleavage A type of early embryonic cleavage in which, after the first few divisions, the cells of the upper quartet in the eight-celled stage lie above and between the cells of the lower quartet and thus tend to form a spiral pattern.

spiral conic (MOLL: Gastropoda) In Trochidae, an advancing spiral, winding around an axis and forming a cone shape.

spiralia n.pl.; sing. spiralium [L. spira, coil] (BRACHIO) Two spirally coiled supports of the secondary shell for the plec-tolophe or spirolophe.

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