1. Species Diatoma gracillima Hantzsch, 1861
2. Species Diatoma moniliformis Kützing, 1833
3. Species Diatoma rhombica E.O'Meara, 1877
4. Species Diatoma vulgare Bory de Saint-Vincent, 1831 accepted as Diatoma vulgaris Bory de Saint-Vincent, 1824 (correct name, after Blanco & Williams 2015)
5. Species Diatoma arcuatum Lyngbye in Hornemann, 1818 (uncertain > unassessed)
6. Species Diatoma auritum Lyngbye, 1819 (uncertain > unassessed)
7. Species Diatoma constricta (Grunow) D. M. Williams, 1985 (uncertain > unassessed)
8. Species Diatoma crystallinum C.A. Agardh, 1824 (uncertain > unassessed)
9. Species Diatoma elongatum (Lyngbye) C.A. Agardh, 1824 accepted as Diatoma tenue var. elongatum Lyngbye, 1819 (uncertain > unassessed)
10. Species Diatoma fasciculata C.A.Agardh, 1812 accepted as Tabularia fasciculata (C.Agardh) D.M.Williams & Round, 1986 (uncertain > unassessed, homotypic synonym)
11. Species Diatoma fasciculatum C.A. Agardh, 1812 (uncertain > unassessed)
12. Species Diatoma fenestratum Lyngbye, 1819 (uncertain > unassessed)
13. Species Diatoma fulgens (Greville) Greville, 1833 accepted as Exilaria fulgens Greville, 1827 (uncertain > unassessed)
14. Species Diatoma hyalinum Kützing, 1844 (uncertain > unassessed)
15. Species Diatoma marinum Lyngbye, 1819 (uncertain > unassessed)
16. Species Diatoma moniliforme (Kützing) D.M.Williams, 2012 (uncertain > unassessed)
17. Species Diatoma tabulatum C.Agardh, 1832 accepted as Tabularia tabulata (C.Agardh) Snoeijs, 1992 (uncertain > unassessed, homotypic synonym)
18. Species Diatoma tenue C. Agardh, 1812 (uncertain > unassessed)

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