Fine structure of the “button setae” in the deep-sea pelagic copepods of the genus Euaugaptilus (Calanoida: Augaptilidae) |
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Authors: | H Matsuura S Nishida |
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Institution: | (1) Ocean Research Institute, University of Tokyo, 1-15-1 Minamidai, Nakano, Tokyo 164-8639, Japan e-mail: matsuura@ori.u-tokyo.ac.jp Fax: +81-3-53516481, JP |
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Abstract: | Many species of the carnivorous copepod family Augaptilidae, a primarily meso- and bathypelagic group, possess specialized
“buttons” on the setae of their maxilla and maxilliped, which have been thought to be a simple cuticular outgrowth. The fine
structure of the button setae in three species of Euaugaptilus was examined by light- and electron microscopy from samples collected in the eastern Indian Ocean and the subtropical western
North Pacific. The buttons are arranged in two rows along the inner surface of the setae. There are differences in the shape,
size, and arrangement of buttons among the three species, Euaugaptiluslaticeps, E.longimanus, and E.magnus. The button setae have an elaborate internal structure consisting of “setal shaft”, “stalk”, “disc”, and “outer membrane”,
with microtubule bundles in the setal lumen, but have no muscular tissues. The disc has only pin-point contact to the core
of the stalk, but has connection over a wider area with the fibrous tissue surrounding the core, and the contact area between
the stalk and the setal shaft is also small. These structures suggest that the disc will move freely on the apex of the core
of the stalk and the stalk may be movable at its connection to the setal shaft. All these components of the button setae may
function in concert to fit the surface of the discs firmly to the surface of a prey, and to absorb the energy generated by
the struggling prey.
Received: 30 November 1999 / Accepted: 19 May 2000 |
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