115 Palmerina hardmaniana 哈德掌狀藻 Phylum: Heterokontophyta 门：不等鞭毛門 Class: Coscinodiscophyceae 纲：中心硅藻綱 Order: Coscinodiscales 目：圓篩藻目 Family: Coscinodiscaceae 科：圓篩藻科 Morphology Cells are solitary and have thin frustules with large size. The cells are hemispherical in shape. Valves are relatively flat and semilunate, with a straight ventral part and round blunt ends. Numerous small granular chloroplasts are present in the cells. 形態 細胞單細胞生活，細胞壁較大，較薄。細胞呈半球形。殼面較平，呈半月形，腹面 平直，兩端鈍圓。色素體多，顆粒較小。 Ecology and distribution Palmeria hardmaniana is a cosmopolitan species in subtropical and tropical waters. 生態與分佈 哈德掌狀藻是浮游物種，廣泛分佈於亞熱帶和熱帶海域。 Size Length (diameter, apical axis): 228 μm (Chin et al., 1965); 303-534 μm (Tomas, 1997); 65-483 μm (Guo et al., 2003); 465-511 μm (Al-Kandari et al., 2009); 420-550 μm (AlYamani et al., 2019)
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