Lacinia mandibulae see lacinia mobilis

lacinia mobilis 1. (ARTHRO: Crustacea) A small, generally toothed process articulated with the incisor process of the mandible. 2. (ARTHRO: Insecta) A small movable lobe-like process near the extremity of the mandible; a prostheca.

laciniate a. [L. lacer, torn] Slashed or cut into irregularly narrow lobes or deep segments.

lacteous a. [L. lac, milk] Of white or milky color.

lactescent a. [L. lactescere, to turn to milk] Like milk in appearance; yielding or secreting a milky fluid.

lactic acid Organic acid formed in tissues of two molecules for every molecule of glucose used where oxygen is in short supply.

lacuna n.; pl. -ae [L. lacuna, cavity] 1. A space, gap, cavity or channel. 2. (ACANTHO) Channels making up the lacunar system. 3. (ARTHRO: Insecta) In wing development, canals that contain nerves, tracheae, and hemolymph. 4. (BRACHlO:Articulata) The large open space surrounding the lophophore. 5. (BRYO) Open space between tubular pore-chambers. 6. (MOLL: Bivalvia) Irregular, blood-filled spaces between various organs in the mantle and visceral mass.

lacunar system (ACANTHO) The circulatory system.

lacunose a. [L. lacuna, cavity] Marked by shallow, scattered depressions; pitted.

lacustrine a. [L. lacus, lake] Of or pertaining to living in or near a lake.

laeotorma n; pl. -ae [Gr. laios, left; torma, socket] (ARTHRO: Insecta) In beetle larvae, transverse sclerite extending inward from the left hind angle of the epipharynx, usually with a projection.

laeotropic a. [Gr. laios, left; tropos, turn] Of or pertaining to the left; sinistral; opposed to dexiotropic.

lagena n. [L. lagaena, flask] 1. Bottle-shaped; dilated below and tapering to a narrow neck above; lageniform. 2. (ARTHRO: Insecta) In Lepidoptera, the smaller lobe of the spermatheca; may be fused into one organ. see utriculus.

Lamarckism A theory espoused by Lamarck, that evolution is brought about by volition or by environmental induction; Geoffroyism.

lamella n.; pl. -ae [L. lamella, small plate] 1. A thin plate or leaflike structure. 2. (ARTHRO: Chelicerata) A triangular plate on the promargin of the cheliceral fang furrow in some spiders. 3. (MOLL: Gastropoda) Flared axial projection of the outer lip of the shell.

lamellar ligament (MOLL: Bivalvia) That part of the ligament secreted by the mantle edge that is lamellar in structure and contains no calcium carbonate; elastic to both compression and tension.

lamellate a. [L. lamella, small plate] Composed of or covered by thin scales, plates or layers.

lamellate antennae (ARTHRO: Insecta) Antennae with an asymmetrical 3- to 7-segmented club of more or less flattened segments.

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