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The hydranth of Salacia tetracythara (Cnidaria: Hydrozoa: Sertulariidae) and its modified tentacles

Published online by Cambridge University Press:  18 December 2008

Nicole Gravier-Bonnet
Nicole Gravier-Bonnet*
Affiliation:
Laboratoire d'Ecologie Marine, Faculté des Sciences et Technologies, Université de La Réunion, 15 Avenue René Cassin—BP 7151, 97715 Saint-Denis messag cedex 9—La Réunion, France
*
Correspondence should be addressed to: N. Gravier-Bonnet, Laboratoire d'Ecologie Marine, Faculté des Sciences et Technologies Université de La Réunion, 15 Avenue René Cassin—BP 7151 97715 Saint-Denis messag cedex 9—La Réunion, France email: Nicole.Gravier-Bonnet@univ-reunion.fr
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Abstract

Study of living colonies of Salacia tetracythara Lamouroux, 1816, led to an accurate description of the hydranths and adjoining tissues. A mantle is reported for the first time for this species, lining stem, hydrocladia and hydrotheca. An adcauline nematocyst clump located in the median part of the column, composed of large microbasic mastigophores, is also reported as a new structure for sertulariids. The hypothetical modified tentacles noted by Billard (1925) are confirmed and re-described. Among the 22–28 tentacles of the hydranth in a circlet, two exhibit nematocyst-bearing organs connected at base. These organs are massive, racket-shaped, refringent, and composed of large microbasic mastigophores. They do not affect the tentacles in respect of their general shape and behaviour. One nematocyst-bearing organ can sometimes be linked to more than one tentacle depending on its size. The abcauline position of the two modified tentacles imparts a strong bilateral symmetry to the hydranth. This location explains why only one modified tentacle was previously described from preserved material, the second being hidden by the first when hydranths are retracted inside the hydrotheca. The modified tentacles of S. tetracythara are compared with the nematodactyls of the genus Nemalecium, with the ligula found in several sertulariid species, and with nematophores described in other thecate families. Beside remarks on species taxonomy and distribution, incitation is given to the study, with emphasis especially on hydranths.

Keywords

HydrozoaSertulariidaeSalacia tetracytharahydranthtentaclesligulamantlenematocysts clusternematophorestaxonomy
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 88 , Special Issue 8: Hydrozoans , December 2008 , pp. 1723 - 1729
Copyright
Copyright © Marine Biological Association of the United Kingdom 2008

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