THE MARINE DIATOM GENUS TRYBLIOPTYCHUS HENDEY (THALASSIOSIRACEAE, COSCINODISCOPHYCEAE): FINE STRUCTURE, TAXONOMY, SYSTEMATICS AND DISTRIBUTION

Abstract

Detailed examination of the fine structure of frustules in Tryblioptychus cocconeiformis (Grunow ex Cleve) Hendey, the generitype, supports its placement in the family Thalassiosiraceae, as suggested by Simonsen (1979). Its taxonomic relationships are discussed. An account of its geographical distribution is also presented. Examination of original illustrations and descriptions suggests that Cyclotella crassa Tynni, a marine diatom described from the Persian Gulf, is probably conspecific with Tryblioptychus cocconeiformis.