Les diatomées monoraphidées des îles Kerguelen

Abstract

The monoraphidinae, in the Kerguelen Islands, are represented by the two genera, Achnanthes and Cocconeis, producing a total of 35 taxa of which 2 are deemed to be described for the first time. Most of the species and varieties were examined by L.M., S.E.M. and M.E.T.; a detailed account of their morphology is often given. Vestigial raphe traces occurred in the rapheless valves of several species and varieties. In addition, the presence of “pores” at the ends of the axial area was observed in the rapheless valve of some other species. These “pores” may be considered as vestiges of “terminal pores” of a former raphe or as precursors of a true raphe that has not yet evolved fully on the rapheless valve. © Masson, 1983.