349 下殼：甲藻細胞橫溝以下的部分。 Hypotheca: The smaller half of a diatom frustule. 下殼：硅藻硅質壁較小的一半。 Intercalary setae: Setae emerge from internal valves of cells that cross each other. 內角毛: 由殼與殼之間的殼邊相互交叉伸出的角毛。 Mantle: The marginal part of a diatom valve that extends from the valve face and forms the edge of the valve. The mantle is visible when a frustule is viewed in girdle view. 殼套：硅藻殼面由殼邊延伸至轉彎的部分。硅質壁的殼環面觀殼套可見。 Mucocyst: An ejectile organelle, a sac-like structure that releases mucous, or mucous threads through the cell pores. 黏液泡：囊狀結構的細胞器，透過細胞小孔釋出黏膜或黏液線體。 Pervalvar axis: The axis of the valve which is perpendicular to the center of the valve face. In centric diatoms, the center is the meeting point of the radii. In pennate diatoms, the center is the meeting point of the apical and transapical axes. 貫殼軸：垂直於殼面中心的軸。 中心硅藻的中心位於半徑交會處，羽紋硅藻的中 心位於縱軸和橫軸交會處。 Raphe: A slit crosses through the valve face of pennate diatom and usually positions along the apical axis of the cell. It enables the pennate diatom to move over substrates in aquatic environment. The raphe system includes the slit and the mucilaginous material that is secreted from the cell and used for cell motility. 殼縫: 在羽紋硅藻殼面上的一個狹縫，通常位於縱軸上。殼縫使硅藻在水中固體表 面滑行移動。殼縫系统包含狭缝以及细胞分泌的辅助细胞运动的粘液。 Rimoportula (labiate process): A tubular process in the valve of some diatoms. It is characterised by a lip-shaped slit on the internal face of the valve. Rimoportula appears either a tube or a pore in the valve wall externally. 唇形突: 一些硅藻殼面上的管狀突起物。主要特徵在於殼面內層有唇狀裂縫。在殼
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