Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

44Maggenti and Gardneralternating cleavage see spiral cleavagealternation of generations The alternation of two or moregenerations reproducing in different ways; an alternation ofsexual and asexual, or parasitic with a free-living cycle. seealloiogenesis, digenesis, heterogamy, heterogenesis,heterogony, metagenesis.alternative inheritance see allelismaltitude see heightaltricial a. [L. altrix, nourisher] Having young at hatching orbirth that require care for sometime.altruism n. [L. alter, the other] Behavior disadvantageous tothe individual, but benefits other individuals of the species.alula n.; pl. -lae [L. dim. ala, wing] (ARTHRO: Insecta) 1. Insome Diptera, one of the membranous lobes in the regionof the wing base, thought to be part of the vannal region.see thoracic squama, alar squama. 2. In some Coleoptera,the alula is folded beneath the elytron/jugum.alulet n. [L. dim. ala, wing] (ARTHRO: Insecta) In Diptera, alobe at the basal posterior part of the wing; wing appendage;posterior lobe. see alula.alutaceous a. [L. alutaceus, soft leather] Pertaining to brownor brownish-yellow; leathery; covered with, or appearinglike, minute cracks.alveator n. [L. alveatus, hollowed out] (ECHINOD) A form ofpedicellaria; usually two valved and recessed into an alveolusor depression in the endoskeleton.alveola n.; pl. -lae [L. alveolus, small cavity] A small pit ordepression on the surface of an organ; faveolus; alveolus.alveolar a.alveolar hydatid cyst (PLATY: Cestoda) A larval form of Echinococcusmultilocularis comprised of many compartmentscontaining many protoscolices that infiltrate body tissues.alveolate a. [L. alveolus, small cavity] Deeply pitted or havingthe appearance of a honeycomb.alveolus n.; pl. -eoli [L. alveolus, small cavity] Any small cavity,pit or depression; alveola.