A abactinal a. [L. ab, from; Gr. aktis, ray] (ECHINOD) Of or pertaining to the area of the body without tube feet that normally does not include the madreporite; not situated on the ambulacral area; abambulacral. abactinally adv. abambulacral see | A abactinal a. L. ab from Gr. aktis ray ECHINOD Of or pertaining to the area of the body without tube feet that normally does not include the madreporite not situated on the ambulacral area abambulacral. abactinally adv. abambulacral see abactinal A-band That zone of the sarcomere composed of both actin and myosin filaments. abapertural a. L. ab from apertura an opening MOLL Gastropoda Refers to being away from any shell aperture. abapical a. L. ab from apex top 1. Pertains to the opposite of apical and thus the lower pole of spherical organisms. 2. MOLL Gastropoda Away from the shell apex toward base along axis or slightly oblique to it. abaxial a. L. ab from axis axle Refers to being situated outside of or directed away from the axis or central line. see adaxial. abbreviate fascia ARTHRO Insecta A fascia extending less than half the wing. abcauline a. L. ab from caulis stalk CNID Hydrozoa Pertaining to polyps that extend outwards from the common stem. see adcauline. abdomen n. L. abdomen belly 1. ARTHRO The posterior of the three main body divisions of insects not homologous with chelicerate opisthosoma. 2. ARTHRO Crustacea The trunk somites with or without limbs between the thorax and telson the pleon. abdomere n. L. abdomen belly Gr. meros part An abdominal segment. abdominal feet see prolegs abdominal filament see cercus 2 Maggenti and Gardner abdominal ganglia ARTHRO Ganglia of the ventral nerve cord that innervate the abdomen each giving off a pair of principal nerves to the muscles of the segment located between the alimentary canal and the large ventral muscles. abdominal process ARTHRO Crustacea In Branchiopoda fingerlike projections on the dorsal surface of the abdomen. abdominal somite ARTHRO Crustacea Any single division of the body between the thorax and telson a pleomere a pleonite. abduce v. L. abducere to lead away To draw or conduct away. abduct v. L. abducere to lead away To draw away from position of median plane or axis. abductin n. L. abducere
