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Takayama Gen, Nov (Gymnodiniales, Dinophyceae), a new genus of unarmored Dinoflagellates with sigmoid apical grooves, including the description of two new species


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de Salas, MF and Bolch, CJS and Botes, L and Nash, G and Wright, SW and Hallegraeff, GM (2003) Takayama Gen, Nov (Gymnodiniales, Dinophyceae), a new genus of unarmored Dinoflagellates with sigmoid apical grooves, including the description of two new species. Journal of Phycology, 39 (6). pp. 1233-1246. ISSN 0022-3646

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A new potentially ichthyotoxic dinoflagellate genus, Takayama de Salas, Bolch, Botes et Hallegraeff gen. nov., is described with two new species isolated from Tasmanian (Australia) and South African coastal waters: T. tasmanica de Salas, Bolch et Hallegraeff, sp. nov. and T. helix, de Salas, Bolch, Botes et Hallegraeff, sp. nov. The genus and two species are characterized by LM and EM of field samples and laboratory cultures as well as large subunit rDNA sequences and HPLC pigment analyses of several cultured strains. The new Takayama species have sigmoid apical grooves and contain fucoxanthin and its derivatives as the main accessory pigments. Takayama tasmanica is similar to the previously described species Gymnodinium pulchellum Larsen, Gyrodinium acrotrochum Larsen, and G. cladochroma Larsen in its external morphology but differs fromthese in having two ventral pores, a large horseshoe-shaped nucleus, and a central pyrenoid with radiating chloroplasts that pass through the nucleus. It contains gyroxanthin-diester and a gyroxanthin-like accessory pigment, both of which are missing in T. helix. Takayama helix has an apical groove that is nearly straight while still being clearly inflected. A ventral pore or slit is present. It has numerous peripheral, strap shaped, and spiraling chloroplasts with individual pyrenoids and a solid ellipsoidal nucleus. The genus Takayama has close affinities to the genera Karenia and Karlodinium.

Item Type: Article
Keywords: apical grooves; Gymnodinium pulchellum; Gyrodinium acrotrochum; Gyrodinium cladochroma; Karenia; Karlodinium; LSU rDNA sequences; pigments; Takayama; T. helix; T. tasmanica; taxonomy
Journal or Publication Title: Journal of Phycology
Page Range: pp. 1233-1246
ISSN: 0022-3646
Identification Number - DOI: 10.1111/j.0022-3646.2003.03-019.x
Additional Information: The definitive version is available at www.blackwell-synergy.com
Date Deposited: 15 Nov 2007 04:49
Last Modified: 18 Nov 2014 03:25
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