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Behaviour of the shrimp ectosymbionts, Peregrinamor ohshimai (Mollusca: Bivalvia) and Phyllodurus sp. (Crustacea: Isopoda) through host ecdyses

Published online by Cambridge University Press:  15 February 2002

Gyo Itani
Affiliation:
Seto Marine Biological Laboratory, Graduate School of Science, Kyoto University, Shirahama, Wakayama 649-2211, Japan
Makoto Kato
Affiliation:
Graduate School of Human and Environmental Studies, Kyoto University, Yoshida-Nihonmatsu-cho, Sakyo-ku, Kyoto 606-8501, Japan
Yoshihisa Shirayama
Affiliation:
Seto Marine Biological Laboratory, Graduate School of Science, Kyoto University, Shirahama, Wakayama 649-2211, Japan

Abstract

The behaviour of two ectosymbiotic animals, Peregrinamor ohshimai (a bivalve attached to the ventral cephalothorax of the host), and Phyllodurus sp. (a bopyrid isopod attached to the second pleopod of the host), during ecdyses of the host thalassinidean Upogebia shrimps was studied by time-lapse video of infested shrimps. In the intermoult stages of the hosts, both ectosymbionts did not move. However they moved on to the newly emerged body of the host at the time when the host moulted. Peregrinamor ohshimai began to move just after the host started moulting, whereas Phyllodurus sp. moved prior to ecdysis of the host and waited near the fissure from which the newly moulted body emerges first. There are highly correlated morphological relationships between the symbionts and the hosts. It is suggested that both ectosymbionts grow with the same host individuals after infection, keeping morphological affinity with their hosts without being discarded during ecdyses of the hosts.

Type
Research Article
Copyright
© 2002 Marine Biological Association of the United Kingdom

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