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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, Bolch, CJS, Botes, L, Nash, G, 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, vol. 39, no. 6 , pp. 1233-1246 , doi: 10.1111/j.0022-3646.2003.03-019.x.

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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
Authors/Creators:de Salas, MF and Bolch, CJS and Botes, L and Nash, G and Wright, SW and Hallegraeff, GM
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
ISSN: 0022-3646
DOI / ID Number: 10.1111/j.0022-3646.2003.03-019.x
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