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VALVE MORPHOLOGY OF SYNEDRA GOULARDI (BACILLARIOPHYCEAE) 1
Author(s) -
Schwarzwalder Robert N.,
Postek Michael T.
Publication year - 1981
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1111/j.1529-8817.1981.tb00870.x
Subject(s) - biology , diatom , genus , neogene , anatomy , zoology , botany , paleontology , structural basin
ABSTRACT Specimens of Synedra goulardi Bréb. from samples taken in Costa Rica were acid cleaned and examined by light and scanning electron microscopy. This linear‐lanceolate diatom displays an unusual pattern of markings in its central area which have been mistaken as striae but are actually internal costae. As is typical for members of its genus and that of many other genera in the Fragilariaceae, S. goulardi possesses non‐stalked labiate processes, apical pore fields and a lack of marginal spines. There is a great deal of variability in the striae of the genus, ranging from single rows of puncta to areolate striae. Synedra goulardi has double punctate striae. The presence of fossil forms (Neogene) with single punctate striae suggest this may be a primitive condition in the genus.