The diatom genus Ctenophora: A discussion on its morphology, relationships, and some species Author Williams, David M. 0000-0002-0584-307X The Natural History Museum, London, UK. d.m.williams@nhm.ac.uk Author Vijver, Bart Van De Research Department, Meise Botanic Garden, Meise, Belgium. & Department of Biology - ECOBE, University of Antwerp, Wilrijk, Belgium. text Phytotaxa 2023 2023-12-27 632 1 1 26 https://phytotaxa.mapress.com/pt/article/download/phytotaxa.632.1.1/51385 journal article 10.11646/phytotaxa.632.1.1 1179-3163 10435352 Ctenophora pulchella var. smithii (Ralfs in A.Pritch.) H.Schönf. 1907: 104, 248, invalid = ?? Basionym: Synedra smithii Ralfs in A.Pritch. 1861: 786 non S. smithii O’Meara 1875: 313 , pl. 28, fig. 42 A brief description, attributed to Ralfs, was given in Pritchard, which included vague locality details and the opinion that it is Synedra acicularis W. Sm. (1853: 70, pl. 11, fig. 86, see Fig. 58 ): ‘Frustules irregularly affixed; valves lanceolate, acute, with 36 very faint striae in . 001.” = Synedra acicularis , SBD. i. p. 70, pl. 11. f. 86. Brackish water. England’ (Pritchard 1861: 786). Smith’s Synedra acicularis (non Synedra acicularis Kütz. 1844: 63 , which is a species of Nitzschia Hassall ) is very likely another species of Ctenophora as has been previously recognised by O’Meara (1876: 304, as Synedra pulchella var. acicularis ) and West & West 1901: 196 , also as Synedra pulchella var. acicularis ) (Van de Vijver pers. obs). A few slides in BM may be of original Ralfs’ material.