Mastogloia subacuta Hustedt, 1933

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 : 115

48. Mastogloia subacuta Hustedt Fig. 40

References: Hustedt (1927 –1966), p. 523, fig. 957; Simonsen (1987a), p. 142, pl. 230, figs 1–4.

Samples: Moen1_ Padina

Dimensions: 30.6 μm long, 11.6 μm wide.

Diagnostics: Valve lanceolate-elliptical valve with sharply pointed rostrate apices, partecta offset, chambers of two distinct sizes, larger toward the middle.

Comments: The valve shape and the septa structure is similar to M. subacuta in Hustedt collection ( Simonsen 1987a, b). Differs from M. seychellensis , which also has offset partecta, but has gradually tapering chambers and blunt rostrate apices.

Figures

FIGURES 35–47. Twelve diatom species of Mastolgoia. Fig. 35. M. acutiuscula. Fig. 36. M. citrus. Figs 37–39. M. cyclops. Fig. 40. M. subacuta. Fig. 41. M. seychellensis. Fig. 42. M. erythraea. Fig. 43. M. erythraea forma 3. Fig. 44. M. cf. grunowii. Fig. 45. M. decussata. Fig. 46. M. pulchella. Fig. 47. M. graciloides. Scale bar = 10 μm.