Ardissonea De Notaris 1871, emend. Poulin et al. 1986, emend. Lobban & Ashworth

Description.

Valves elongate, linear to lanceolate, alveolate except at the apical pole, owing to an internal silica plate and longitudinal costae under the annulus and sometimes under the midline. Inner plate opening through several large foramina at the poles and each alveolus opening by a small foramen into the cell interior.

Included species.

Ardissonea robusta (Ralfs) De Notaris (generitype).

Ardissonea densistriata Lobban sp. nov.

Ardissonea formosa (Hantzsch) Grunow ex De Toni.

Ardissonea pulcherrima (Hantzsch) Grunow ex De Toni.