KOMURA, Seiichi 1999 (Dec. 31) Further observations on valve attachment within diatom frustules and comments on several new taxa Diatom 15: 11-50, 266 figs. [photos], 6 text-figs [Early Miocene, Nabuto Formation, Boso Peninsula, Japan; incl. Biturricula, Dactylacanthis, Eustephanias, Stephanonycites, Stictolecanon n.g.]