Thalassiosira nanolineata (A. Mann) Fryxell & Hasle Figs 104–106

Ref. illus.: Mann 1925, p. 68, pl. 14, fig. 4; Fryxell & Hasle 1977 p. 32, figs. 74–80; Sar et al. 2002 Table 1; Y. Li et al. 2013, p. 99, figs 89–94; J.S. Park et al. 2016, p. 414, fig. 28

Samples: GU44Z-15, GU52P-9

Dimensions: 12.8–19.8 diam., areolae 8–9 in 10 µm

Diagnostics: Areolae linear, not radial, single row of fultoportulae around the margin, their external part ending in a cuplike structure with a central post. Rimoportula inserted between two fultoportulae (rather than replacing one). Two central fultoportulae.

Comments: Although the areolar density is lower than most records (Y. Li et al. 2013 the exception), these specimens seem to agree with the modern concept of the species originally described from the Philippines by Mann (1925). The surveys of Thalassiosira diversity in Argentina (Sar et al. 2002), Guangdong Province, China (Y. Li et al. 2013), and South Korea (J.S. Park et al. 2016) are all very helpful in identifying the species here.