Volumen 43 - Número 1: 25-40 | 2008
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Rarely reported dinoflagellates of the genera Ceratium, Gloeodinium, Histioneis, Oxytoxum and Prorocentrum (Dinophyceae) from the open southeast Pacific Ocean

Fernando Gómez^1*, Hervé Claustre^2,3 and Sami Souissi⁴

¹Laboratoire d’Océanographie Physique et de Biogéochimie, CNRS UMR 6535, Centre d’Océanologie de Marseille, Université de la Méditerranée, 163 Avenue de Luminy, Case 901, 13288 Marseille, France
²UPMC Univ. Paris 06, UMR 7093, Laboratoire d’Oceanographie de Villefranche, Quai de la Darse, 06230 Villefranche-sur-Mer, France
³CNRS, UMR 7093, LOV, 06230 Villefranche-sur-Mer, France
⁴Laboratoire d’Océanologie et de Géosciences, Station Marine de Wimereux, Université des Sciences et Technologies de Lille-Lille1, 28 avenue Foch, BP 80, 62930 Wimereux, France

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Rarely reported dinoflagellates of the genera Ceratium, Gloeodinium, Histioneis, Oxytoxum and Prorocentrum from a ~8000 km transect between the Marquesas Islands Archipelago and the Chilean coast are briefly described and illustrated. Nineteen species of the genus Oxytoxum and seven species of the genus Histioneis were identified to species level. Photographic records of Histioneis hyalina and H. cf. pulchra are for the first time reported. One specimen ascribed to Histiophysis sp., a genus never reported since the first description, is illustrated. Beyond the singlecell specimens of Prorocentrum, a colonial behavior was observed. A small species, identified as Prorocentrum dentatum, was encountered forming rows. Colonies of pairs of ellipsoidal or sphaerical cells embedded in a hyaline matrix have been ascribed to Gloeodinium marinum. Ceratium lanceolatum is for the first time reported in the South Pacific Ocean since the first description. Photographic records of Ceratium carnegiei, C. divaricatum and C. lanceolatum are reported.

Key words: Exuviaella, Histiophysis, phytoplankton, protist, Pyrrhophyta