The species boundaries and biogeography of two closely related diatom species: Nitzschia longissima (Bréb.) Grunow, 1862 and N. rectilonga Takano, 1983

Abstract

Abstracts-The species boundaries and biogeography of two closely related diatom species, Nitzschia longissima (Bréb.) Grunow and N. rectilonga Takano, are described. Based on the structure and morphological features of frustule valves, a reliable distance between these two species has been determined. It is shown that there is a reproductive barrier between the two species. The distribution of N. longissima and N. rectilonga and the range and character of their natural habitats have been analyzed.

Additional floristic study of planktonic and seaweed-associated diatoms in Chuuk, Micronesia

“…• Mediterranean: Karadag natural reserve, Republic of Crimea, Black Sea (Shorenko et al, 2016), Sea of Marmara (Deniz et al, 2006) • North-western Pacific: Japanese water (Takano, 1983), Weno Island, Chuuk, Micronesia (This study)…”

“…This is a first report from Micronesian waters, North-western Pacific. Comments: This species is similar to N. longissima, but N. rectilonga differs in the presence of the hyaline field, a labiate cylinder on the margin of fibulae and with respect to the size of the projection of the raphe central nodule on the inside (Shorenko et al, 2016). This is a first record from Micronesian waters.…”