Hyalosynedra laevigata (Grunow) D.M. Williams & Round

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 : 106

14. Hyalosynedra laevigata (Grunow) D.M. Williams & Round Figs 17, 18

References: Williams & Round (1986), p. 318, figs 17–23; Navarro & Lobban (2009), p. 136, figs 48–51; Al-Handal et al. (2016), p. 8, pl. 6, fig. 8.

Samples: Moen1_ Halimeda, Moen 2_ Halimeda, Moen 3_ Halimeda

Dimensions: 89.5–120.7 μm long, 4.3–5.4 μm wide; striae not resolvable.

Comments: A new study by Sabir et al. (2018) shows that there is considerable diversity within taxa that resemble Hyalosynedra with SEM characters needed to separate many of them. In particular, Stricosus Sabir & Theriot differs from Hyalosynedra in the symmetry of the rimoportula covers, the number of rows of pores in the ocellulimbus and the depth to which the ocellulimbus is sunk. H. laevigata differs from H. sublaevigata in having a linear sternum (versus lanceolate) and in the number pores across the ocellulimbus.

Figures

FIGURES 9–22. Eleven diatom species of Urneidophycidae and Fragilariophycidae. Figs 9 and 10. Talaroneis sp. Fig. 11. Plagiogramma cf. pulchellum. Fig. 12. Psammodiscus nitidus. Fig. 13. Cyclophora tenuis. Fig. 14. Bleakeleya notata. Figs 15 and 16. Tabularia parva. Figs 17 and 18. Hyalosynedra laevigata. Fig. 19. Podocystis spathulata. Fig. 20. Neofragilaria anomala. Fig. 21. Opephora sp. Fig. 22. Grammatophora marina. Scale bar = 10 μm.