Abstracts:

Evidence for a new genus within the Gymnodiniales from different datasets

A.J. Haywood1, K.A. Steidinger2, E.W. Truby2, G.Kirkpatrick3, T. Suzuki4, Ian Garthwaite5 and L. Mackenzie1

1 Cawthron Institute, 98 Halifax St East, Nelson, New Zealand 2Florida Marine Research Institute, Florida Fish and Wildlife Commission, St Petersburg, Florida, 33701 3Mote Marine Laboratory, Sarasota, Florida 4Tohoku National Fisheries Research Institute, 3-27-5 Shinhama, Shiogama, Miyagi 985-0001, JAPAN 5Agresearch, Ruakura Agricultural Research Centre

Different datasets are used in systematics to help identify homologous characters and natural groups among similar organisms. Morphological, ultrastructural, thecal polysaccharide, pigment, toxin, and molecular analyses of the international reference species G.mikimotoi, G.breve, and both similar and morphologically different species from New Zealand were compared. The total evidence and congruence among morphological and biochemical characters strongly suggests that a suite of species currently assigned to either Gymnodinium or Gyrodinium are closely related to each other and not to the type species Gymnodinium fuscum or Gyrodinium spirale. A summary of this work will be presented with detailed inter-laboratory studies of pigment and toxin analyses presented separately.

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