Alveolate species of Mastogloia (Bacillariophyceae, Mastogloiales), including M. frickei Hustedt 1933 from Guam and two renamed species from Florida

Abstract

Mastogloia frickei Hustedt was found in Guam and studied with scanning electron microscopy. A species known by that name in Florida/Bahamas is shown to be a different species and is described as Mastogloia floridensis sp. nov. Both have alveolate striae, which is unusual in the genus. A third alveolate species was present in Florida samples and had been misidentified previously. It is described as Mastogloia lucayensis sp. nov. Ultrastructure observations of these species expand the diversity of alveolate stria morphology.