Lamina of insertion see insertion plate

lamina phalli (ARTHRO: Insecta) In Caelifera, endophallic membrane sclerotizations restricting the spermatophore sac.

laminar a. [L. lamina, plate] Arranged in thin plates or layers;

laminiform.

laminate a. [L. lamina, plate] Composed of leaf-like, overlapping plates or scales.

laminiform a. [L. lamina, plate; forma, shape] Laminar.

lampbrush chromosomes Very large chromosomes with fine lateral projections; found in invertebrates and vertebrates.

lanate a. [L. lana, wool] Covered with long, very fine or wooly hairlike filaments.

lanceolate a. [L. lanceola, little lance] Tapering to a point at the apex, or sometimes at both ends; lance-shaped.

lancet n. [L. lancea, light spear] 1. Any piercing structure. 2. (ARTHRO: Insecta) a. In Hymentoptera, the first valvulae. b. The first gonapophyses of Apis. 3. [NEMATA] Small teeth in the buccal cavity of some nematodes.

lancinate v.t. [L. lancinare, to tear to pieces] To tear, lacerate, pierce or stab.

Lang's vesicle (PLATY: Turbellaria) A blind extension of the female canal of certain Acotylea, proximal to where the oviducts join.

lantern n. [L. lanterna, lantern] 1. (ARTHRO: Insecta) The light organs of fireflies and certain beetles. 2. (MOLL: Cephalopoda) The photophore. see Aristotle's lantern.

lanuginous a. [L. lanugo, down] Covered with very fine soft hair.

lapidicolous a. [L. lapis, stone; colere, to inhabit] Living under stones.

lapidrous a. [L. lapis, stone] Of the nature of a stone.

lappet n. [A.S. laeppa, a loose hanging part] 1. A fold, small flap, lobe or loose hanging portion. 2. (ARTHRO: Crustacea) In Mysidacea, a ventrally projecting subdivision of the pleura. 3. (CNID: Scyphozoa) A flaplike projection on the bell margin. 4. (ECHINOD: Crinoidea) A movable plate on the margin of an ambulacral groove. 5. (ECHI) In Bonelli-dae, the shortened arms of the proboscis. 6. (PLATY: Turbellaria) In Tricladida, earlike process on the head.

larva n.; pl. -ae [L. larva, mask] The preadult stage in some invertebrates after hatching from the egg, lacking adult features, usually active and feeding. larval a.

larval-pupal apolysis (ARTHRO: Insecta) In Diptera, the interim before the cryptocephalic pupa. see pupal-adult apolysis.

larval shell (MOLL: Gastropoda) The hard parts of a pelagic larva before it settles down and undergoes metamorphosis.

larval stages The period of growth between molts.

larval stem nematogen (MESO: Rhombozoa) In Dicyemida, an early stage in development.

larvarium n. [L. larva, mask; -arium, place of a thing] A nest or case made by a larva as a shelter.

larvate see pupa larvata larviform a. [L. larva, mask; forma, shape] Shaped like a larva.

larviparous a. [L. larva, mask; parere, to produce] Producing by bringing forth living larvae; viviparous. see oviparous.

larvipositor n. [L. larva, mask; ponare, to place] (ARTHRO: Insecta) A modified ovipositor.

larvivorous a. [L. larva, mask; vorare, to devour] Larvae eating.

lasiopod n. [Gr. lasios, wooly; pous, foot] (ARTHRO: Crustacea) A cirral appendage of barnacles, with a transverse row of setae at each articulation. see acanthopod, ctenopod.

lasso n. [L. laqueus, snare, noose] 1. (CNID) Fibrils, thought to be contractile, extending down the stalk of a cnidoblast securing the nematocyst. 2. (NEMATA) Circular traps; a three-celled ring of predacious fungi that constrict around a nematode, penetrating the cuticle and ramifying inside the tissue.

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