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.

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