Marine benthic diatoms of Guam: new records, Dictyoneis apapae sp. nov., and updates to the checklist Author Lobban, Christopher S. Division of Natural Sciences, University of Guam, Mangilao, GU 96923, USA clobban @ triton. uog. edu clobban@triton.uog.edu Author Witkowski, Andrzej University of Szczecin, Institute of Marine and Environmental Sciences Mickiewicza 16 a, PL 70 - 383 Szczecin, Poland text Micronesica 2023 2024-06-06 2023 2 1 75 journal article 299061 10.5281/zenodo.12118784 2b921c3c-8618-439e-96da-1de9c66a90f9 0026-279X 12118784 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.