| Revision of the genus Fragilaria DM Williams, FE Round Diatom Research 2 (2), 267-288, 1987 | 415 | 1987 |
| Cladistics: a practical course in systematics. The Sysstematics Assn. Pubn. No. 10 PL Forey, CJ Humphries, IJ Kitching, RW Scotland, DJ Siebert, ... Clarendon Press Oxford, 1992 | 345* | 1992 |
| A check-list of the freshwater, brackish and marine diatoms of the British Isles and adjoining coastal waters B Hartley, R Ross, DM Williams Journal of the Marine Biological Association of the United Kingdom 66 (03 …, 1986 | 284 | 1986 |
| Congruence between molecular and morphological phylogenies C Patterson, DM Williams, CJ Humpries Annual Review of Ecology and Systematics, 153-188, 1993 | 273 | 1993 |
| Foundations of systematics and biogeography GJ Nelson Springer, 2008 | 217* | 2008 |
| Revision of the genus Synedra Ehrenb DM Williams, FE Round Diatom Research 1 (2), 313-339, 1986 | 217 | 1986 |
| ‘Integrative taxonomy’then and now: a response to Dayrat (2005) AG Valdecasas, D Williams, QD Wheeler Biological Journal of the Linnean Society 93 (1), 211-216, 2008 | 129 | 2008 |
| The evolution of the diatoms (Bacillariophyta). I. Origin of the group and assessment of the monophyly of its major divisions LK Medlin, DM Williams, PA Sims European Journal of Phycology 28 (4), 261-275, 1993 | 126 | 1993 |
| Comparative morphology of some species of Synedra Ehrenb. with a new definition of the genus DM Williams Diatom Research 1 (1), 131-152, 1986 | 107 | 1986 |
| Morphology, taxonomy and inter-relationships of the ribbed araphid diatoms from the genera Diatoma and Meridion (Diatomaceae: Bacillariophyta) DM Williams J. Cramer, 1985 | 102 | 1985 |
| Description of Conticribra tricircularis, a new genus and species of Thalassiosirales, with a discussion on its relationship to other continuous cribra species of Thalassiosira … K Stachura-Suchoples, DM Williams European Journal of Phycology 44 (4), 477-486, 2009 | 80 | 2009 |
| Phylogenetic biogeography deconstructed MC Ebach, CJ Humphries, DM Williams Journal of Biogeography 30 (9), 1285-1296, 2003 | 80 | 2003 |
| Biodiversity at the molecular level: the domains, kingdoms and phyla of life TM Embley, RP Hirt, DM Williams Philosophical Transactions of the Royal Society of London. Series B …, 1994 | 79 | 1994 |
| Pursuit of a natural classification of diatoms: History, monophyly and the rejection of paraphyletic taxa DM Williams, JP Kociolek European Journal of Phycology 42 (3), 313-319, 2007 | 68 | 2007 |
| Fragilariforma, nom. nov., a new generic name for Neofragilaria Williams & Round DM Williams, FE Round Diatom research 3 (2), 265-266, 1988 | 67 | 1988 |
| Is Farris Optimization perfect?: three‐taxon statements and multiple branching NI Platnick, CJ Humphries, G Nelson, DM Williams Cladistics 12 (3), 243-252, 1996 | 63 | 1996 |
| illustrated catalogue of the type specimens in the Greville diatom herbarium DM Williams, RK Greville British Museum (Natural History), 1988 | 62 | 1988 |
| Amphorotia nov. gen., a new genus in the family Eunotiaceae (Bacillariophyceae), based on Eunotia clevei Grunow in Cleve et Grunow DM Williams, G Reid ARG Gantner Verlag KG; Distributed by Koeltz Scientific Books, 2006 | 59 | 2006 |
| Checklist of diatoms (Bacillariophyta) from Lake Ohrid and Lake Prespa (Macedonia), and their watersheds Z Levkov, DM Williams Phytotaxa 45 (1), 1-76, 2012 | 57 | 2012 |
| Synedra, Ulnaria: definitions and descriptions–a partial resolution DM Williams Diatom Research 26 (2), 149-153, 2011 | 55 | 2011 |
