Fragilaria crenophila (Graeff, Kociolek & S.R. Rushforth) Rioual, 2017

Rioual, Patrick, Flower, Roger J., Chu, Guoqiang, Lu, Yanbin, Zhang, Zhongyan, Zhu, Bingqi & Yang, Xiaoping, 2017, Observations on a fragilarioid diatom found in inter-dune lakes of the Badain Jaran Desert (Inner Mongolia, China), with a discussion on the newly erected genus Williamsella Graeff, Kociolek & Rushforth, Phytotaxa 329 (1), pp. 28-50 : 44

Fragilaria crenophila (Graeff, Kociolek & S.R. Rushforth) Rioual comb. et nom. nov.

Basionym: Williamsella angusta Graeff, Kociolek & S.R. Rushforth (2013: 7, figs 19–37) non Fragilaria angusta Ehrenberg (1838: 205 , Taf. 15, fig. XVI, 1, 2)

It is noteworthy to add that in 1838, Ehrenberg described and illustrated Fragilaria angusta ( Ehrenberg 1838: 205, Taf. 15, fig. XVI), a species named a few years earlier, but not described, for specimens from Siberia (Ehrenberg 1832: 62, 68, “ Saratof an der Volga”, 70, “Tobolsk im Nordwestlichen Sibirien am Irtysch und Tobol”). While the catalogue compiled by Clara Ehrenberg, his daughter, included reference to the original drawings of Fragilaria angusta and it is possible to examine these, no reference was made to the source of the specimens. Even though it is virtually impossible to accurately determine what Fragilaria angusta Ehrenberg might be from either the drawings or the published images, Ehrenberg’s name is still validly published. Thus, for Williamsella to be transferred to the genus Fragilaria it needs a new name, in this case, Fragilaria crenophila .