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首页> 外文期刊>european journal of phycology >Morphology and taxonomy of three little-known marine planktonicChaetocerosspecies (Bacillariophyceae)
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Morphology and taxonomy of three little-known marine planktonicChaetocerosspecies (Bacillariophyceae)

机译：三种鲜为人知的海洋浮游动物毛尾龙（Bacillariophyceae）的形态和分类学

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Three marine planktonic species of the diatom genusChaetoceroswere studied by light and electron microscopy, from net samples collected from different tropical and subtropical areas: coasts of Baja California, the Gulf of Tehuantepec (both in the Pacific Ocean), the Gulf of Mexico (the Atlantic Ocean) and the Indian Ocean. Two of the species,Chaetoceros pseudodichaetaandC. pseudoaurivilli, were originally described by Ikari in 1926 from Japanese waters. This is the second record of them.C. pseudodichaetais superficially similar toC.dichaetabut detailed morphology differs, especially that of the intercalary setae, which are four-sided in cross-section, with long spines at the edges, and a pattern of two striae between two costae.Chaetoceros pseudoaurivilliis a distinctive species with a characteristic domeshaped protuberance on terminal valves and the presence of various rimoportulae on, at least, terminal valves of the chain. Finally,C. pseudosymmetricusis a species only reported twice in the Indian Ocean. Its distinctive character is the heteropolarity of terminal setae: one is coarse, long and strongly curved, and the other is delicate, shorter and smoothly curved. It also has a single rimoportula on terminal valves only. The three species are regarded as rare, and consequently our knowledge of their distribution is rather poor. Additional taxonomic comments are provided for the three species.
机译：硅藻属的三种海洋浮游生物物种Chaetoceros通过光学和电子显微镜研究了从不同热带和亚热带地区收集的净样本：下加利福尼亚海岸，特万特佩克湾（均在太平洋），墨西哥湾（大西洋）和印度洋。其中2种，Chaetoceros pseudodichaetaandC.pseudoaurivilli，最初是由 Ikari 于 1926 年在日本水域描述的。这是它们的第二次记录.C. pseudodichaetais 表面上与 C.dichaetas 相似，但详细形态不同，尤其是闰节，横截面为四面，边缘有长刺，两肋之间有两条条纹的图案。Chaetoceros pseudoaurivilliis是一种独特的物种，在末端阀上具有特征性的圆顶状突起，至少在链的末端阀上存在各种肋骨。最后，假对称梭菌（C. pseudosymmetricusis）在印度洋仅报道过两次。它的显着特征是末端节的异极性：一个是粗糙的、长的、强烈的弯曲的，另一个是精致的、短的、光滑的弯曲。它还仅在末端阀上有一个 rimoportula。这三个物种被认为是稀有的，因此我们对它们的分布知之甚少。为这三个物种提供了额外的分类注释。

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