Pseudictyota bicornis (Cleve) PA Sims & DM Williams

Lobban, Christopher S. & Witkowski, Andrzej, 2023, Marine benthic diatoms of Guam: new records, Dictyoneis apapae sp. nov., and updates to the checklist, Micronesica 2023 (2), pp. 1-75 : 32

Pseudictyota bicornis (Cleve) PA Sims & DM Williams in Sims et al. 2018

Synonym: Triceratium bicorne Cleve

Sims et al. 2018: 38, figs 139–43 (as ‘Pseudodictyota bicorne’)

[Note that Triceratium pulchellum was not transferred. Our images show valves with porate structure, not pseudoloculate, so this is not a Pseudictyota .]

Schizostauron cf. trachyderma (F.Meister) Górecka & Riaux-Gobin Our species identified as Achnanthes citronella is a species of Schizostauron but we can so far only propose it as Schizostauron cf. trachyderma (F.Meister) Górecka & Riaux-Gobin. The difficulties in deciding whether it is that species, S. kajotkei Dabek, Górecka & Witkowski , or neither was discussed with reference to Chuuk specimens by J.S.Park et al. (2022), and the SEM images we have to date for this species do not resolve the question. See Riaux-Gobin et al. (2015), Davidovich et al. (2017) and Górecka et al. (2021).