Synedrosphenia baculum (Gregory) Lobban & Ashworth, 2022

Lobban, Christopher S., Ashworth, Matt P., Camacho, Terance, Lam, Daryl W. & Theriot, Edward C., 2022, Revision of Ardissoneaceae (Bacillariophyta, Mediophyceae) from Micronesian populations, with descriptions of two new genera, Ardissoneopsis and Grunowago, and new species in Ardissonea, Synedrosphenia and Climacosphenia, PhytoKeys 208, pp. 103-184 : 103

Synedrosphenia baculum (Gregory) Lobban & Ashworth comb. nov.

Synedra baculus Gregory, Trans. Micr. Soc. London, 5: p. 83, pl. 1, fig. 54, 1857. Based on GenBank sequence wk76 (Wiebe Kooistra). Basionym.

Registration.

Phycobank http://phycobank.org/103252.

Comment.

Since Synedrosphenia baculum (baton, rod) is used as a noun in apposition, it should retain its neuter ending, even though Gregory (1857) wrote it Baculus . This is an orthographical change that does not require any formal action under ICN rules, Art. 61 ( Turland et al. 2018).

In addition, A. dalmatica ( Kützing) De Toni, 1892, shown by Álvarez-Blanco and Blanco (2014) to have a pseudoseptum and single wall, clearly belongs in Synedrosphenia . We have not made a new combination here, pending further investigation into its relationship to A. crystallina . Similarly, we do not have enough information to decide where to place Ardissonea brockmannii 'brockmanni ' Hustedt, 1932 ( Hustedt 1931-1959, p. 228, fig. 716).