Amphora spectabilis Gregory 1857

Amphora spectabilis Gregory Figs 3, 4 Ref. illus.: Levkov 2009, p. 265, pl. 114, figs 1–5, pl. 252, figs 1–5 (SEM). Samples: GU55B-5 Dimensions: Length 30 µm, width 12 µm, stria density 8 in 10 µm (dorsal) and 13 in 10 µm (ventral) Diagnostics: More strongly and coarsely striated on the dorsal surface, dorsal striae often biseriate and bifurcating towards the sternum, ventral striae uniseriate. Comment: Our specimens (seen also in Yap and Palau) are much shorter than the 68–129 µm given by Levkov (2009). A Palauan specimen (Fig. 4) seen in SEM shows that the striae are mostly biseriate, the bifurcations resulting from the two rows diverging; these images conform to the specimens shown by Levkov in SEM.美丽双眉藻（Amphora spectabilis Gregory） 图3、4 参考文献图示资料引自Levkov 2009年，第265页，图版114之1–5、图版252之1–5（扫描电子显微镜（Scanning Electron Microscope, SEM）） 标本：GU55B-5 尺寸：长30 μm，宽12 μm，条纹密度：背侧每10 μm有8条条纹，腹侧每10 μm有13条条纹 鉴别特征：背侧表面的条纹更为粗壮且排列相对稀疏，背侧条纹常呈双列，并向龙骨脊（sternum）分叉；腹侧条纹为单列。 评论：本次研究的标本（在雅浦岛和帕劳均有采集）远短于Levkov（2009年）记载的68–129 μm。一件帕劳标本（图4）经扫描电子显微镜观察显示，其条纹大多为双列，分叉现象源于两列条纹的相互分离；这些图像与Levkov（2009年）扫描电子显微镜图版中的标本一致。