lorica n.; pl. -ae [L. lorica, corselet] A hard shell or case on Rotifera, Loricifera and Priapulida larvae. see cuirass.
loricate a. [L. lorica, corselet] To cover with a protective coating or crust.
loricifera n. [L. lorica, corselet; fero, bear] A phylum of microscopic organisms with a flexible, retractable tube mouth, a girdle of platelets and a crown of clawlike and club-shaped spines.
lorum n.; pl. lora [L. lorum, strap] 1. (ARTHRO: Chelicerata) In Arachnida, a protective dorsal plate on the pedicle. 2. (ARTHRO: Insecta) a. The cheek. b. A sclerite on both sides of the head of Homoptera and certain Hemiptera, and Hy-menoptera. c. In Apis, the submentum. d. In Homoptera, a narrow lateral sclerite between the clypeus and the front extending to the genae, that is an upward extension of the hypopharynx.
lotic a. [L. lotus, washed] Living in rapidly flowing waters; applied to organisms that inhabit these waters. see lentic.
lower a. [ON. lagr, low] (moll) The abapical part of the shell.
lower latus plate (ARTHRO: Crustacea) In Cirripedia, a valve near the basis of the shell.
loxometaneme n. [Gr. loxos, oblique; meta, behind; nema, thread] (nemata) Metaneme that is at an angle of 10-30 o to the longitudinal body line; found running diagonally across the lateral hypodermal cords.
lozenge n. [OF. losenge, a square window pane] A parallelogram with four equal sides having two acute and two obtuse angles; lozenge-shaped; a rhombus form; diamond-shaped.
lucid a. [L. lucidus, clear] Luminous; translucent; pellucid; shining.
luciferase n. [L. lux, light; ferre, to bring; -ase, enzyme] An enzyme of luminescent organisms involved in the oxidation of luciferin and the production of light.
luciferin n. [L. lux, light; ferre, to bring] A substance found in luminescent organisms that, in the presence of the enzyme luciferase, oxidizes and produces light.
lucifugous a. [L. lux, light; fugere, to flee] Avoiding the light, or living in concealment. see photophobic, lucipetal.
lucinoid teeth (MOLL: Bivalvia) Having 2 cardinal teeth in each valve; left valve anterior tooth is medial below the beak.
lucipetal a. [L. lux, light; petere, to seek] Requiring light. see lucifugous.
lumbar ganglia (NEMATA) Large paired ganglia in the anal region which receive the lateral nerves and from which the laterocaudal nerves pass posteriad in the tail.
lumbriciform a. [L. lumbricus, earthworm; forma, shape] Like an earthworm in appearance; lumbricoid. see vermiform.
lumbricine a. [L. lumbricus, earthworm] (ANN: Oligochaeta) Having 4 pairs of setae per segment as in earthworms of the family Lumbricidae. see perichaetine.
lumen n. [L. lumen, light] Space within any tubular organ or vessel.
lumenate a. [L. lumen, light] Having a lumen.
luminescent a. [L. lumen, light; escens, beginning of] Producing light. see bioluminescence.
luminescent organ 1. Specialized light emitting organs of various invertebrates. see bioluminescence. 2. (MOLL: Cephalopoda) Open ectodermal pockets filled with luminescent bacteria.
lunate a. [L. luna, moon] Semicircular; falcate; crescent-shaped.
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