URL：https://www.researchgate.net/profile/Laury-Acaf/publication/342259745/figure/fig2/AS:903640483123202@1592456088852/Figure-3-Representatives-of-the-four-sub-genera-A-C-praelongum-Subg-Archaeceratium_Q640.jpg
掲載元：https://www.researchgate.net/figure/Figure-1-Overview-of-the-external-morphology-and-its-terminology-of-athecate-and-thecate_fig1_342259745
