Roperia tesselata (Roper) Grunow ex Pelletan

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 : 103

1. Roperia tesselata (Roper) Grunow ex Pelletan Fig. 2

References: Fryxell et al. (1986), p. 24, figs XXV, XXXII-3, 4; Lee & Lee (1990), p. 327–329, figs 1–19.

Samples: Moen2_ Halimeda

Dimensions: 29.2 μm in diameter; 8 areolae in 10 μm in the valve center, 11 in the valve margin.

Diagnostics: Valve circular, areolae arranged eccentric, a distinct pseudonodule in the margin.

Comments: The areolae arrangement of specimens from Moen Island match the warm type of R. tesselata shown by Lee & Lee (1990). The pseudonodule on the margin also occurs in Actinocyclus , from which Roperia differs in the non-segmental arrangement of the areolae and in the silica flaps over the external rimoportula openings.

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.