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Observations on two closely related species, Chaetoceros tetrastichon and C. dadayi (Bacillariophyceae)
Author(s) -
HernándezBecerril David U.
Publication year - 1992
Publication title -
nordic journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.333
H-Index - 33
eISSN - 1756-1051
pISSN - 0107-055X
DOI - 10.1111/j.1756-1051.1992.tb01316.x
Subject(s) - chaetoceros , biology , diatom , subgenus , seta , annulus (botany) , genus , plankton , botany , subtropics , mediterranean sea , mediterranean climate , ecology , phytoplankton , nutrient
Two tropical‐subtropical species of the diatom genus Chaetoceros, C. tetrastichon and C. dadayi were studied in light, scanning and transmission electron microscopy, from plankton samples collected in the Gulf of California, off the coasts of Baja California and the Mediterranean Sea. Both species are usually found to be attached to a tintinnid. The basic structure of both species agrees with previous studies of species belonging to the subgenus Phaeoceros , including the finely perforated cell wall of the valves and the presence of one rimoportula in every valve of the cells in the chain, which is located in the centre of the annulus. A clear costae pattern was found in C. tetrastichon , but it is less apparent in C. dadayi. Other differences between the two species are the direction and morphology of the setae, especially the anterior terminal ones, and the number of girdle bands. Questions on the function of the setae in Chaetoceros continue offering matter for speculation.