Longitudinal canal see longitudinal tube

longitudinal muscle 1. (ECHI) Layer of longitudinal muscle of the body wall sometimes thickened into bundles. 2. (nemata) The somatic muscles of nematodes. 3. (SIPUN) Innermost layers of muscle that make up the body wall of the trunk.

longitudinal rugae (NEMATA) The cuticular fold projecting anteriorly from the stoma of diplogasterids supporting the cir-cumoral membrane.

longitudinal section Section along or parallel to the longitudinal axis.

longitudinal septum (ARTHRO: Crustacea) An inner and outer laminae partition of the compartmental plate in some bala-nomorph barnacles, resulting in longitudinal tubes; parietal tubes.

longitudinal tube (ARTHRO: Crustacea) In some Balanamor-pha, a canal between longitudinal septa and inner and outer lamina in the compartmental plate; longitudinal canal; parietal tube; parietal pore.

loop n. [ME. loupe, loop] (BRACHIO) A support for the lopho-phore composed of secondary shell and variously placed, usually ribbon-like with or without supporting septum from floor of the brachial valve.

looper n. [Eng. looper, to crawl or slink] (ARTHRO: Insecta) 1. Caterpillars with two or more anterior prolegs reduced or missing. 2. Crawl in a looping manner like the Geometridae (inch worm).

lophobranchiate a. [Gr. lophos, crest; branchia, gills] Having tufted gills.

lophocaltrops n. [Gr. lophos, crest; A.S. coltraeppe, type of thistle] (PORIF) A sponge spicule with branched or crested rays.

lophocytes n. [Gr. lophos, crest; kytos, container] (PORIF) Mobile collagen-secreting cells that trail attached collagen fibrils.

lophophoral fold (bryo) Part of the vesicle of the polypide from which the lophophore is formed.

lophophore n. [Gr. lophos, crest; pherein, to carry] A crown of tentacles, found in Bryozoa, Brachiopoda and Phoronida.

lophophore neck (BRYO: Gymnolaemata) A long movable cylindrical structure formed by the everted tentacle sheath that allows extension of the tentacles beyond the orifice.

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