ABSTRACT A new species of the marine dinophyte genus Heterocapsa Stein is described. Two clonal strains originating from Argentinean coastal waters were examined with light and electron microscopy and LSU and ITS rDNA sequence data were obtained. Heterocapsa claromecoensis sp. nov. is described as a distinctive species with a conical epitheca, a similar sized and rounded hypotheca, a single reticulate chloroplast situated in the periphery of the cell, and a large pyrenoid in the episome, above an ellipsoidal to rounded nucleus in the hyposome. The plate tabulation pattern of Po (pore plate), cp (cover plate), X (X-plate or canal plate), 5ꞌ, 3a, 7ꞌꞌ, 6c, 5s, 5ꞌꞌꞌ, 2ꞌꞌꞌꞌ was as for most other species of Heterocapsa. H. claromecoensis sp. nov. differs from all other species of Heterocapsa by the microarchitecture of two different types of organic body scales, which uniquely were different in height. Phylogenetic trees based on LSU and ITS rDNA sequences placed H. claromecoensis in a separate branch, with a sequence assigned to H. orientalis being the closest match based on LSU rDNA.

中文翻译：

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Heterocapsa claromecoensis sp. 的形态和分子特征。十一月 (Peridiniales, Dinophyceae) 来自布宜诺斯艾利斯沿海水域（阿根廷）

摘要 描述了海洋甲藻属 Heterocapsa Stein 的一个新种。用光学和电子显微镜检查了源自阿根廷沿海水域的两个克隆菌株，并获得了 LSU 和 ITS rDNA 序列数据。Heterocapsa claromecoensis sp. 十一月 被描述为一种独特的物种，具有圆锥形上壳，类似大小和圆形的下壳，位于细胞外围的单个网状叶绿体，以及附加体中的大蛋白核，位于下体中椭圆形至圆形的核上方。Po（孔板）、cp（盖板）、X（X-板或管板）、5ꞌ、3a、7ꞌꞌ、6c、5s、5ꞌꞌꞌ、2ꞌꞌꞌꞌ的板块排列模式与大多数其他异果树种相同。H. claromecoensis sp. 十一月 由于两种不同类型的有机体鳞片的微结构，它们与所有其他种类的异蒺藜不同，它们的高度不同。基于 LSU 和 ITS rDNA 序列的系统发育树将 H. claromecoensis 置于一个单独的分支中，分配给 H. orientalis 的序列是基于 LSU rDNA 的最接近匹配。