Heterocapsa circularisquama sp. nov. (Peridiniales, Dinophyceae): A new marine dinoflagellate causing mass mortality of bivalves in Japan
Heterocapsa circularisquama sp. nov. (Peridiniales, Dinophyceae): A new marine dinoflagellate causing mass mortality of bivalves in Japan
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DOI：
10.1111/j.1440-1835.1995.tb00016.x
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发表时间：
1995-01-01
影响因子：
1.5
通讯作者：
Horiguchi, Takeo
中科院分区：
文献类型：
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作者：
Horiguchi, Takeo
记述了产于日本中部阿果湾的圆鳞异囊藻Heterocapsa circuliquama Horiguchi sp. nov.这种甲藻在日本中部和西部的海湾造成了大规模的赤潮，并导致双壳类的大量死亡，特别是珍珠牡蛎。细胞小，由圆锥形的上皮层和半球形的下囊组成。叶绿体是单一的，并连接到单一的蛋白核。细胞核是细长的，位于细胞的左侧。其排列方式为：Po，cp，5 '，3a，7”，6c，5s，5”'，2”“。Heterocapsa circuliquama在形态上与Heterocapsa illdefina非常相似，在光学显微镜水平上几乎不可能区分这两个物种。体鳞的形态和蛋白核基质的超微结构是区分这两个种的特征。H.圆形鳞片在圆形基板上有六个放射状的脊;在H的鳞片的大致三角形基板上没有观察到这样的脊。不清楚。此外，后者物种的鳞片具有明显较短的刺相比，H。圆鳞H. circulariaquama几乎不被细胞质小管穿透，而在H.蛋白核样基质总是被许多细胞质小管穿透。根据泡膜板的排列、体鳞的形态和蛋白核的超微结构，我把H.将圆囊壳属（Heterocapsa.）
Heterocapsa circularisquama Horiguchi sp. nov. is described from Ago Bay, central Japan. The dinoflagellate produced large-scale red tides in the bays of central and western Japan and caused mass mortality of bivalves, notably the pearl oysters. The cell is small and is composed of a conical epitheca and a hemi-spheroidal hypotheca. The chloroplast is single and is connected to the single pyrenoid. The nucleus is elongated and is located in the left side of the cell. Thecal plate arrangement has been determined as: Po, cp, 5', 3a, 7", 6c, 5s, 5" ', 2" ". Heterocapsa circularisquama is morphologically very similar to Heterocapsa illdefina and it is almost impossible to distinguish these two species at light microscopical level. The characteristics which can be used to distinguish these two species are the morphology of body scales and the ultrastructure of the pyrenoid matrix. The body scales of H. circularisquama possess six radiating ridges on the circular basal plate; no such ridges can be observed on the roughly triangular basal plate of the scales of H. illdefina. Furthermore, the scales of the latter species possess substantially shorter spines compared to those of H. circularisquama. The pyrenoid matrix of H. circularisquama is hardly perforated by cytoplasmic tubules, while in H. illdefina the pyrenoid matrix is always penetrated by many cytoplasmic tubules. Based on the arrangement of thecal plates, morphology of body scales, and ultrastructure of the pyrenoid, I am placing H. circularisquama sp. nov. into the genus Heterocapsa.