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首页> 外文期刊>Phycological Research >New species of the diatom genus Fryxelliella (Bacillariophyta), Fryxelliella pacifica sp. nov., from the tropical Mexican Pacific
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New species of the diatom genus Fryxelliella (Bacillariophyta), Fryxelliella pacifica sp. nov., from the tropical Mexican Pacific

机译：硅藻属的新物种Fryxelliella（Bacillariophyta），Fryxelliella pacifica sp。十一月，来自热带墨西哥太平洋

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摘要

During phytoplankton monitoring of coasts off Salina Cruz, Oaxaca, in the tropical Mexican Pacific, a new species, Fryxelliella pacifica sp. nov., was found and is described in this paper. The species is solitary, with cells of medium size, discoid with three relatively large ocelli on the valve face, located close to the margins (3-5 areolae from the margins) and placed symmetrically. Significantly, it possesses the morphological characters that distinguish the genus Fryxelliella from related genera: the presence of the 'circumferential marginal tube' (siphon marginalis), the external subcircular or subtriangular apertures at the valve margins, and the 'juxtaposed rectangular plates' in the valve mantle. The species that appears to be the most closely related is Fryxelliella floridana Prasad, an extant species and the type of the genus. However Fryxelliella pacifica differs from it (i) the size and shape of the cell; (ii) the size, location and structure of the ocelli (which additionally are not elevated); (iii) the shape and density of the subcircular to subtriangular marginal apertures; (iv) the external morphology of the rimoportulae (short process, two concentric tubes with the outer tube tip as a crown); and (v) it is marine rather than brackish. Externally the rimoportulae have a rather complex structure of two concentric tubes: the exterior tube has a tip divided like a crown. In spite of the fact this species was found in plankton samples, it is considered to inhabit sandy sediments (epipsammic) or as tychoplanktonic.
机译：在热带墨西哥太平洋瓦哈卡州萨利纳·克鲁兹（Salina Cruz）附近海岸的浮游植物监测期间，发现了一个新物种，即Fryxelliella pacifica sp。 nov。，被发现并在本文中进行了描述。该物种是单生的，具有中等大小的细胞，盘状，在瓣膜上有三个相对较大的卵泡，靠近边缘（边缘有3-5个乳晕）并对称放置。重要的是，它具有区分弗雷克斯氏菌属和相关属的形态特征：“周缘边缘管”（虹吸缘）的存在，瓣膜边缘的外部亚圆形或亚三角形孔以及“并列矩形板”的存在。阀套。似乎最密切相关的物种是Fryxelliella floridana Prasad，它是现存物种和该属的类型。但是，Fryxelliella pacifica与之不同（i）细胞的大小和形状; （ii）ocelli的大小，位置和结构（此外没有升高）; （iii）圆形至三角形下边缘孔的形状和密度; （iv）线虫的外部形态（短过程，两个同心管，外管尖端为冠状）; （v）它是海洋的而不是微咸的。外部的缘门有两个同心管的相当复杂的结构：外管的尖端像冠一样分开。尽管该物种是在浮游生物样本中发现的，但仍被认为栖息于沙质沉积物（表胺类）或强壮性浮游动物。

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