Takayama gen. nov (Gymnodiniales, Dinophyceae), a new genus of unarmored dinoflagellates with sigmoid apical grooves, including the description of two new species
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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DOI：
10.1111/j.0022-3646.2003.03-019.x
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发表时间：
2003-12-01
影响因子：
2.9
通讯作者：
Hallegraeff, GM
中科院分区：
文献类型：
--
作者：
de Salas, MF;Bolch, CJS;Hallegraeff, GM
一种新的潜在鱼毒甲藻属，Takayama de Salas、Bolch、Botes et Hallegraeff gen。 11 月，描述了从塔斯马尼亚（澳大利亚）和南非沿海水域分离出的两个新物种：T. tasmanica de Salas, Bolch et Hallegraeff, sp.。十一月和 T. helix，de Salas，Bolch，Botes et Hallegraeff，sp。十一月通过现场样品和实验室培养物的 LM 和 EM 以及大亚基 rDNA 序列和几个培养菌株的 HPLC 色素分析对该属和两个物种进行了表征。高山新种具有乙状顶沟，含有岩藻黄质及其衍生物作为主要辅助色素。 Takayama tasmanica 在外部形态上与之前描述的 Gymnodinium pulchellum Larsen、Gyrodinium acrotrochum Larsen 和 G. cladochroma Larsen 相似，但不同之处在于有两个腹孔、一个大的马蹄形核和一个带有穿过核的辐射叶绿体的中央蛋白核。它含有陀螺黄质二酯和类似陀螺黄质的辅助色素，这两种物质在 T. helix 中都缺失。高山螺旋的顶端凹槽几乎是直的，但仍然明显弯曲。存在腹侧孔或裂缝。它具有许多外围、带状和螺旋状叶绿体，具有单独的蛋白核和实心椭圆形核。 Takayama 属与 Karenia 属和 Karlodinium 属有密切的亲缘关系。
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 from these 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.