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

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 (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.