Synedrosphenia (H. Peragallo in H. Peragallo and M. Peragallo 1897-1908) Azpeitia 1911, emend. Lobban & Ashworth

Synedrosphenia gomphonema (Janisch and Rabenhorst) Hustedt, 1932. Synonym.

Synedra gomphonema ≡ Synedra gomphonema Janisch & Rabenhorst, 1863 Beiträge zur näheren Kenntniss und Verbreitung der Algen. Heft I, p. 13, pl. 2: fig. 6. Synonym.

Lectotype species here designated.

Sceptroneis cuneata Grunow,1877, Monthly Micros. J. 18: 169, pl. 194, fig. 3 ≡ Synedra cuneata Grunow, 1866, Hedwigia 1: 5.

Registration of lectotype.

Phycobank http://phycobank.org/103264.

Description.

Valves elongate, linear or tapered from a broader apical pole. Wall a single layer usually with internal costae on the virgae, and a pseudoseptum on the rim of the valve at each pole, forming a complex structure with the valvocopula. Midline absent or indistinct (not subtended by a longitudinal costa), annulus usually evident, though sometimes coinciding with the valve-mantle junction.

Included species.

Synedrosphenia gomphonema (Janisch and Rabenhorst) Hustedt (= Sceptroneis cuneata Grunow; type species).

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

Synedrosphenia bikarensis sp. nov.

Synedrosphenia crystallina (C. Agardh) Lobban & Ashworth comb. nov.

Synedrosphenia fulgens (Greville) Lobban & Ashworth comb. nov.

Synedrosphenia licmophoropsis sp. nov.

Synedrosphenia parva sp. nov.