400 individuals collected from Lake Nakuru (Kenya) were studied. The authors had previously reported on morphological variation of this species from Lake Shikotsu (Hokkaido Island) (Fujushima·Ko-Bayashi·Kurihara and Fujita 1992) .But for the current sample, particular features were the large number of individuals with linear-lanceolate frustules (P1.6 Figs E-d.95.8%), gread variation in the outer shape of valves, and individuals for which the fmstule of the central areas extended and connected to both margins (P1.8 Figs Z-f, 18.9%) .
Photomicrographs of individuals from the current samples were compared to those of type specimens of
Fragilaria capucina (Krammer·Lange-Bertalot 1991, P1.108 Figs 1-8) and
Exilaria vaucherae (Lange-Bertalot 1980, P1.1 Figs 26-34, Krammer·Lange-Bertalot 1991, P1.108 Figs 10-15) . With this, it may be thought, with Williams·Round (1987), that this species belongs to
Fragilaria vaucheriae. Among the present sample, some specimens have a strong resemblance to
Synedra parvula (P1.4 Figs A-R) or
Synedra amphicephala (P1.4 Figs S-W) .In addition, many specimens are intermediate between
Fragilaria vaucheriae and both of them, in their morphologies. The species of
Synedra parvulaand
Synedra amphicephalashould be considered a synonyme of
Fragilaria vaucheriae.
Fragilaria vaucheriae (Kuetzing) Boye-Pectersen, in Bot. Not, 1938, 167 Fig 1. 1938.
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