Stigmagloia Glushchenko, Kezlya, Kapustin & Kulikovskiy, 2024

Kezlya, Elena, Glushchenko, Anton, Kapustin, Dmitry, Maltsev, Yevhen, Nhu, Hai Doan- & Kulikovskiy, Maxim, 2024, Stigmagloia lobbanii gen. et sp. nov. (Bacillariophyceae, Mastogloiales), a new stigma-bearing diatom genus separated from Mastogloia, Phytotaxa 677 (1), pp. 49-65 : 51

Stigmagloia Glushchenko, Kezlya, Kapustin & Kulikovskiy , gen. nov.

Description: Valves elliptical, elliptic-lanceolate to lanceolate. Externally raphe branches distinctly undulate. Proximal raphe ends strongly curved and raised above the valve surface. Distal raphe ends hooked towards the same direction and continue onto the valve mantle. Central area with a large round isolated stigma with 5–6 radial outgrowths. Pseudoloculi with round or transapically elongated foramina, located at an angle relative to the valve surface. Valve apices lack pseudoloculi. Valve face separated from the mantle by a marginal ridge. Valve mantle shallow with the mantle striae composed of a single large pseudoloculum. Internally raphe branches straight; proximal ends simple; distal ends terminate in small helictoglossae. Inner areolae one to four per pseudoloculum. Valve apices with pseudosepta. Partectal ring present, partecta equal in size and almost reach the valve apices.

Type species: Stigmagloia lobbanii Glushchenko, Kezlya, Kapustin & Kulikovskiy , sp. nov.

Etymology: the generic name derives from Ancient Greek “στίγμα” [stigma] – a mark, and “γλοιή” [gloia] – a glue, and reflects the presence of a stigma and the similarity with the genus Mastogloia .