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Redescription of the zooxanthellate Eudendrium moulouyensis (Eudendriidae: Hydrozoa) from the Mediterranean Sea

Published online by Cambridge University Press:  08 September 2008

D. De Vito ,
F. Boero ,
C.G. Di Camillo ,
C. Megina  and
S. Piraino
D. De Vito*
Affiliation:
Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università del Salento, via per Monteroni, 73100 Lecce, Italy these authors contributed equally to this work
F. Boero
Affiliation:
Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università del Salento, via per Monteroni, 73100 Lecce, Italy
C.G. Di Camillo
Affiliation:
Dipartimento Scienze del Mare, Università Politecnica delle Marche, Via Brecce Bianche, 60131 Ancona, Italy
C. Megina
Affiliation:
Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università del Salento, via per Monteroni, 73100 Lecce, Italy Departamento de Biologia, Facultad de Ciencias del Mar, Universidad de Càdiz, Apartado 40, E-11510 Puerto Real, Cadiz, Spain
S. Piraino
Affiliation:
Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università del Salento, via per Monteroni, 73100 Lecce, Italy these authors contributed equally to this work
*
Correspondence should be addressed to: D. De Vito, Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università del Salento, via per Monteroni, 73100 Lecce, Italy emails: [email protected], [email protected]
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Abstract

Eudendrium moulouyensis is a zooxanthellate hydroid originally described from the Chafarinas Islands (Alboran Sea, south-western Mediterranean) in summer 1991. According to the original description, this species can be identified due to the occurrence of symbiotic zooxanthellae in the entire endodermal layer of the colony (gastrodermis and tentacle endodermis), a unique feature among the Mediterranean Eudendrium species. However, several aspects of its life cycle and the extent of its phenotypical variability are still unknown. Since winter 2004, colonies of E. moulouyensis were recorded throughout the year from 0.5 m to 30 m depth from the southern Adriatic Sea (Otranto Channel) and the Gibraltar Strait (Alboran Sea). Additional specimens were collected from the northern Adriatic (Vis, Croatia), Sicily Channel (Pantelleria and Lampedusa Islands), and western Sardinia (Costa Paradiso). These findings offered the opportunity to describe for the first time the full life cycle and to elucidate several biological aspects related to phenotypical variation of colony morphology, vertical zonation, seasonality, zooxanthellae–polyp relationship, and cnidome morphology and distribution. The number and morphology of male gonophores per reproductive polyp is described here for the first time, providing a useful taxonomic character to easily discriminate Myrionema amboinense from E. moulouyensis. From the available information, the occurrence of M. amboinense in the Mediterranean Sea should be regarded as doubtful, if they are not accompanied by observations of cnidome, male gonophores or distinctly separate tentacles whorls.

Keywords

HydrozoasymbiosiszooxanthellaeEudendriumMediterranean Sea
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 88 , Special Issue 8: Hydrozoans , December 2008 , pp. 1655 - 1662
Copyright
Copyright © Marine Biological Association of the United Kingdom 2008

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