Abstract
ABSTRACT A unique and elegant setular array on the first antenna of the adult female stage of the carnivorous marine copepod Euchaeta norvegica is described. The setae are aligned along 3 planes where the paired antennae cover one plane. The second plane is covered by elongate straight setae that project anteriorly at the proximal section of the antenna and posteriorly at the distal tip of the antenna. A pair of elongate curved setae on the seventh and eighth segments of the first antenna projects perpendicular to the plane of the antenna and perpendicular to the plane of the straight setae. These 2 curved setae flanked by 2 straight setae on segments 3 and 13 project equidistant in front of the antenna. They form a 4-point quadrangular setal arrangement on each antenna. The paired structure may be designed for the early detection and localization of objects moving in 3 dimensions in the copepod's immediate environment.
Published Version
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