monactinal
adj. [Gr. monos, one; aktis, ray]
(PORIFERA)
Spicule development originating from a fixed point in one direction only.

Online Dictionary of Invertebrate Zoology. . 2005.

Look at other dictionaries:

  • monactinal — mon·ac·ti·nal …   English syllables

  • monactinal — adjective see monactine I …   Useful english dictionary

  • acanthostyle — n. [Gr. akantha, thorn, spine; stylos, pillar] 1. (BRYOZOA: Stenolaemata) A type of stylet with a smooth rod core of nonlaminated calcite, with sheath laminae usually strongly deflected toward the zoarial surface as spines; usually larger than… …   Dictionary of invertebrate zoology

  • sceptrules — n. [Gr. dim. skeptron, royal staff] (PORIFERA: Sclerospongiae) Microscleric monactinal triaxonic spicules that include clavules with terminal umbels or smooth heads …   Dictionary of invertebrate zoology

  • strongyloxea — n. [Gr. strongylos, rounded; oxys, sharp] (PORIFERA) A monactinal megasclere with one end rounded and the other pointed …   Dictionary of invertebrate zoology

  • style — n.; pl. styli [Gr. stylos, pillar] 1. (ARTHROPODA: Chelicerata) The embolus of spiders. 2. (ARTHROPODA: Crustacea) see telson. 3. (ARTHROPODA: Insecta) a. Any slender, tubular or spinelike appendage at the end of the abdomen. b. In some Diptera,… …   Dictionary of invertebrate zoology

  • subtylostyle — n. [L. sub, under; Gr. tylos, knot; style, pillar] (PORIFERA) 1. A monactinal megasclere with a sub apical expansion. 2. A tylostyle with an indistinct knob at one end and pointed at the other; see tylostyle …   Dictionary of invertebrate zoology

  • triactinal — adj. [Gr. treis, three; aktis, ray] (PORIFERA) Having a three pointed or rayed spicule; see diactinal, tetractinal, monactinal …   Dictionary of invertebrate zoology

  • tylostyle — adj. [Gr. tylos, knob; stylos, column] (PORIFERA) A monactinal monaxon knobbed at the broad end and pointed at the other; see subtylostyle …   Dictionary of invertebrate zoology

  • Sponge spicule — Sponge spicules Spicules are structural elements found in most sponges. They provide structural support and deter predators. Large spicules, visible to the naked eye are referred to as megascleres, while smaller, microscopic ones are termed… …   Wikipedia

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