Thalassiosira cf. cedarkeyensis Prasad

Park, Joon Sang, Lobban, Christopher S. & Lee, Kyun-Woo, 2018, Diatoms associated with seaweeds from Moen Island in Chuuk Lagoon, Micronesia, Phytotaxa 351 (2), pp. 101-140 : 105

3. Thalassiosira cf. cedarkeyensis Prasad Fig. 4

References: Prasad et al. (1993), p. 205, figs 1–23; Prasad et al. (2011), p. 12, figs 32–57; Li et al. (2013), p. 89, figs 23–25.

Samples: Moen1_ Halimeda, Moen 1_ Padina

Dimensions: 8.9–9.9 μm in diameter, 15–16 areolae in 10 μm in the valve center, 19–22 in the valve margin.

Diagnostics: Small cells with undulated valves.

Comments: There are ten Thalassiosira species having a tangentially undulated valve ( Prasad et al. 2011), of which only T. cedarkeyensis has the small size and areola densities of the specimens from Moen Island. SEM would be needed to ascertain most of the taxonomic features used by Prasad et al. (1993) to distinguish among species.

Subclass Biddulphiophycidae Round & R.M. Crawford

Figures

FIGURES 2–8. Seven diatom species of Coscinodiscophyceae and Mediophyceae. Fig. 2. Roperia tesselata. Fig. 3. Triceratium dubium. Fig. 4. Thalassiosira cf. cedarkeyensis. Fig. 5. Ardissonea formosa. Fig. 6. Climacosphenia elongata. Fig. 7. Toxarium hennedeyanum, Fig. 8. T. undulatum. Scale bar = 10 μm.