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Fluorescence distribution pattern allows to distinguish two species of Eugymnanthea (Leptomedusae: Eirenidae)

Published online by Cambridge University Press:  23 September 2008

Shin Kubota ,
Patrizia Pagliara  and
Cinzia Gravili
Shin Kubota*
Affiliation:
Seto Marine Biological Laboratory, Field Science Education and Research Center, Kyoto University, Shirahama, Nishimuro, Wakayama 649-2211, Japan
Patrizia Pagliara
Affiliation:
Department of Biological and Environmental Science and Technology, University of Salento, Lecce, Via per Monteroni 73100 Lecce, Italy
Cinzia Gravili
Affiliation:
Department of Biological and Environmental Science and Technology, University of Salento, Lecce, Via per Monteroni 73100 Lecce, Italy
*
Correspondence should be addressed to: Shin Kubota, Seto Marine Biological Laboratory, Field Science Education and Research Center, Kyoto University, Shirahama, Nishimuro, Wakayama 649-2211, Japan email: [email protected]
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Abstract

The auto-fluorescence patterns of the medusae observed under a fluorescent microscope with blue light excitation allows to distinguish two species of Eugymnanthea, this even when they are still attached to the hydroid as small medusa buds despite the occurrence of a sex-dependant pattern in E. japonica. A total of four distribution patterns of green fluorescence, including non-fluorescence, could be found. Three of them are found in E. japonica, called ‘subumbrellar fluorescence type’ except for non-fluorescence, while another type is found in E. inquilina, called ‘umbrellar margin fluorescence type’. During the short life of the medusa the latter type remained invariable for up to six days in E. inquilina, while the pattern observed for up to seven days in E. japonica changed sometimes, but it always remained distinguishable from the pattern found in E. inquilina. Therefore, the fluorescence pattern is a reliable taxonomic character. Fluorescence was not found in unfertilized eggs, planulae 2–8 days old, parthenogenetically produced larvae, or in the hydroids of the two species. The auto-fluorescent and possible bioluminescent tissues of these Eugymnanthea medusae could have some unknown biological significance.

Keywords

fluorescence distribution patternsEugymnanthea speciesvarious developmental stages
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 88 , Special Issue 8: Hydrozoans , December 2008 , pp. 1743 - 1746
Copyright
Copyright © Marine Biological Association of the United Kingdom 2008

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