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A comparative study of trophi morphology in Seisonidea (Rotifera)

Published online by Cambridge University Press:  01 February 1998

Hendrik Segers  and
Giulio Melone
Hendrik Segers
Affiliation:
Laboratory for Animal Ecology, Zoogeography and Nature Conservation, Department M.S.E., University of Gent, K.L. Ledeganckstraat 35, B-9000 Gent, Belgium
Giulio Melone
Affiliation:
Department of Biology, University of Milan, Via Celoria 26, 20133 Milano, Italy
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Abstract

We report on a comparative scanning electron microscopical study of trophi morphology of the two species making up the Class Seisonidea of Phylum Rotifera. The trophi of the two are generally similar, with morphological differences being interpreted as the result of adaptations to different food sources: the trophi of Seison nebaliae are adapted to particle-feeding, that of Seison annulatus probably functions by piercing the integument of the host using the fulcrum tip, and subsequently sucking out haemolymph. This difference in feeding ecology is believed to contribute to the co-occurrence of both species on the same host. A new hypothesis on the evolution of rotifer trophi is proposed.

Keywords

Comparative morphologytrophi structureSeisonRotiferaphylogeny
Type
Research Article
Information
Journal of Zoology , Volume 244 , Issue 2 , February 1998 , pp. 201 - 207
Copyright
© 1998 The Zoological Society of London

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