Algaebase mentions it as Syringidium Ehrenberg, 1845, nom. rejic. but also mentions that is currently recognized as a distinct genus and the holotype species Syringidium bicorne Ehrenberg is currently accepted taxonomically.

I have read 

Hasle GR & Sims PA (1985) The morphology of the diatom resting spores Syringidium bicorne and Syringidium simplex , British Phycological Journal, 20:3, 219-225

but cannot find 

Hasle, G.R. 1983. Proposal to conserve the generic name Cerataulina H. Perag. ex. Schütt over Syringidium Ehrenb. Taxon 32: 474-475.

Need help regarding this.