Position in a system
| system | Vitae - living organisms |
| domain | Eukaryota Whittaker & Margulis, 1978 - lifeforms with nucletic cells |
| superregnum | Bikonta - bikonts |
| Corticata | |
| kingdom | Chromalveolata Adl et al., 2005 |
| phylum | Heterokontophyta |
| subphylum | Diatomeae (Dumortier, 1821) Cavalier-Smith, 1995 - diatoms |
| class | Bacillariophyceae Haeckel, 1878 |
| subclass | Bacillariophycidae (Haeckel 1878) Mann 1990 |
| order | Naviculales Bessey 1907 |
| suborder | Diploneidineae Mann 1990 |
| family | Diploneidaceae Mann 1990 |
| genus | Diploneis (C. G. Ehrenberg) P.T. Cleve 1894 |
| species | Diploneis oblongella (Nägeli ex Kütz.) R.Ross 1947 |