Cyclotubicoalitus tonlesapensis (Tudesque, Le Cohu & Van de Vijver) K.Schultz, Tudesque & Van de Vijver, 2024

Schultz, Konrad, Tudesque, Loïc & Vijver, Bart Van de, 2024, Transfer of Stephanodiscus tonlesapensis Tudesque, Le Cohu & Van de Vijver to the genus Cyclotubicoalitus (Stephanodiscaceae, Mediophyceae), Notulae Algarum 316, pp. 1-4 : 3

Cyclotubicoalitus tonlesapensis (Tudesque, Le Cohu & Van de Vijver) K.Schultz, Tudesque & Van de Vijver , comb. nov.

Basionym: Stephanodiscus tonlesapensis Tudesque, Le Cohu & Van de Vijver, Diatom Research 36(3): 201, figs 143–192, 2021.

Holotype: BR- 4606 , Meise Botanical Garden, Belgium.

Registration: http://phycobank.org/104314

Type locality: Tonle Sap Lake , Kampong Thom province, Boeng Chhmar district, Cambodia (Lat. 12.816312; Long. 104.307535).

Notes: Regarding the differences between C. undatus and C. tonlesapensis, Tudesque & al. (2021) indicated, apart from the different interpretation of the cuculli, differences in the eccentricity of the central area as well as differences in areola and stria density. Following a comparison with the original description, some issues with the scale bars given by Stoermer & al. (1990) were noted, resulting in different values with, for example, areolar density of ca. 30–120. What appears to be a larger valve in Fig. 5 would be less than 3 µm in diameter ( Stoermer & al. 1990), which is well below the given minimum of 10.5 µm. There may be the need for a more detailed comparison of both taxa to determine and document the relevant differences.