Spindle cell see plasmatocytes

spine n. [L. spina, thorn] A pointed process or outgrowth; thorn-like.

spine base (bryo) A collar-like skeletal inflation at the base of a spine.

spine hairs (ARTHRO: Insecta) Poisonous weapons of many caterpillars, usually of multicellular origin and provided with pointed tips, that upon penetration into human skin are broken, causing irritation; primitive setalike normal hairs.

spiniform a. [L. spina, thorn] Resembling a spine in shape.

spiniger n. [L. spina, thorn; gerere, to carry] (ANN: Poly-

chaeta) Composite seta with terminal blades tapering to fine tips; spines.

spinigerous a. [L. spina, thorn; gerere, to carry] Spine-bearing.

spinneret n. [A.S. spinnan, to spin] 1. (ARTHRO: Chelicerata) In spiders, three pairs of glands at the subcaudal end of the abdomen, covered with minute tubes. see fusula; sericose. 2. (ARTHRO: Insecta) An external apparatus from which silk exudes and is spun; produced by dermal gland openings on the abdomen in Coleoptera; fore tarsi in Em-bioptera and some Diptera; by the Malpighian tubes discharging at the anus in Neuroptera, some Coleoptera and Hymenoptera; discharged from the mouth cavity, usually modified salivary glands in Psocoptera, Siphonaptera, some Diptera, Trichoptera, Lepidoptera and Hymenoptera; in larval bees, the salivarium. 3. (nemata: Adenophorea) The terminal pore of the caudal glands; the cement glands.

spinning bristle (ARTHRO: Insecta) In Embioptera, hollow, seta-like silk ejectors on the ventral surface of the fore tarsus.

spinning glands 1. (ARTHRO) Glands that secrete a silky material; silk glands. 2. (ANN: Polychaeta) Glands of the parapodia that secrete the tube forming material.

spinose, spinous a. [L. spina, thorn] Full of spines; beset with spines; armed with sharp spines.

spinulate a. [L. dim. spina, thorn] Having very small spines.

spinulifer n. [L. dim. spina, thorn; ferre, to bear] (BRACHIO) A radulifer with laterally compressed crura.

spinulose, spinulous a. [L. dim. spina, thorn] Having small spines.

spiracle n. [L. spirare, to breathe] (ARTHRO) A breathing pore or orifice leading to the tracheal or respiratory system; stigma. spiracular a.

spiracular area (ARTHRO: Insecta) In Hymenoptera, the first pleural area.

spiracular atrium (ARTHRO: Insecta) A cavity from which the trachea extend into the body.

spiracular cleft (ARTHRO: Insecta) In some larvae, spiracles found in a closed or open cleft; in closed cleft, one or two liplike structures are usually present; stigmatic cleft.

spiracular depressions (ARTHRO: Insecta) In Coccoidea, usually found on the margin at the base of the spiracular setae.

spiracular disk (ARTHRO: Insecta) In Diptera, a flat area on the caudal segment containing the spiracular openings of aquatic larvae.

spiracular gills (ARTHRO: Insecta) In some aquatic pupae, the long processes formed by the peritreme and atrial regions of one or more pairs of spiracles; adapted both for aquatic and aerial respiration.

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