Protoraphis hustedtiana var. nana Takano, a newly recorded araphid diatom in China
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摘要:
本研究报道了我国首次记录的一个无壳缝类硅藻变种——胡氏原缝藻微型变种（Protoraphis hustedtiana var. nana Takano）。该变种采自广西涠洲岛，为生活在马尾藻（Sargassum spp.）上的植表生硅藻（Epiphytic diatom）。利用光学显微镜和扫描电子显微镜对胡氏原缝藻微型变种的形态进行了详细的观察和描述，并介绍了该变种的生态习性和地理分布。
Abstract:This study reports a newly recorded araphid diatom, Protoraphis hustedtiana var. nana Takano, from Weizhou Island, China. This variety was found epiphytic on Sargassum spp. Its morphology was examined in detail using light and scanning electron microscopy, and its ecological habitat and geographical distribution were documented.
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Keywords:
- Araphid diatom /
- Epiphytic diatom /
- New record /
- Variety /
- China
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图版Ⅰ 胡氏原缝藻微型变种照片。
a：光学显微镜下的形态；b~e：扫描电子显微镜下的形态。b：外壳面整体观；c：内壳面整体观；d：外壳面顶端（黑色箭所示为弓形硅质结构）；e：内壳面顶端（黑色箭所示为弓形硅质结构，白色箭所示为发育不全的刺状或齿状突起）。
图版Ⅰ. Micrographs of Protoraphis hustedtiana var. nana Takano.
a: Light microscopy observation; b-e: Scanning electron microscopy observation. b: External view of whole valve; c: Internal view of whole valve; d: External view of valve end (note siliceous structure indicated by black arrow); e: Internal view of valve end (note siliceous structure indicated by black arrow, and spine or tooth-like process indicated by white arrow).
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图版Ⅱ 胡氏原缝藻微型变种手绘图。
a：光学显微镜下的形态；b~g：扫描电子显微镜下的形态。b：外壳面整体观；c：内壳面整体观；d：外壳面顶端（黑色箭所示为弓形硅质结构）；e：内壳面顶端（黑色箭所示为弓形硅质结构，白色箭所示为发育不全的刺或齿状突起）；f：外壳面中部；g：内壳面中部。
图版Ⅱ. Drawings of Protoraphis hustedtiana var. nana Takano.
a: Light microscopy observation; b-g: Scanning electron microscopy observation. b: External view of whole valve; c: Internal view of whole valve; d: External view of valve end (note siliceous structure indicated by black arrow); e: Internal view of valve end (note siliceous structure indicated by black arrow, and spine or tooth-like process indicated by white arrow); f: External view of mid-valve; g: Internal view of mid-valve.
表 1 胡氏原缝藻微型变种不同种群之间的形态特征比较
Table 1 Morphological characteristics of Protoraphis hustedtiana var. nana from different regions
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