Reinvestigation of West African Surirellaceae (Bacillariophyta) described by Foged from Ghana
Cocquyt, Christine; Kusber, Wolf-Henning
Type microscope slides and material from Ghana from which Foged described nine new Surirella taxa in the 1960's were reinvestigated. Although these taxa have not been reported in the literature afterwards, the results of our study confirm the identity of six species: Surirella agonaensis, S. bonsaensis, S. esamangensis, S. nagbogensis, S. sorriensis and S. takoradiensis. They constitute an important element of the endemic diatom flora of West Africa. The study of Surirella takoradiensis var. suhinensis resulted in its proposed synonymy with the nominate variety. Surirella delicatissima var. ghanaensis is transferred to the genus Stenopterobia: Stenopterobia delicatissima var. ghanaensis (Foged) Cocquyt & Kusber comb. nov. Valves resembling Foged's drawing of Surirella dodowaensis could not be detected on the holotype slide; however, two observed frustules in girdle view are in agreement with the description of this taxon.The report of Surirella ventricosa, a diatom described from Sulawesi, in samples from Ghana could not to be justified. Valves similar in shape to S. ventricosa fall within the variability of the closely related S. nagbogensis, described from Ghana.