Abstract

A new species of Mallomonas, M. nieringii sp. nov., is described from a small, poorly buffered, acidic locality on Cape Cod, Massachusetts, U.S.A. Cells are covered with uniquely sculptured scales, each scale of which may possess a single bristle. Cell, scale and bristle morphology all indicate that this new species should be placed within the series Punctiferae of the section Punctiferae, which now has four recognized species and one variety. Scales of the apical ring are highly asymmetric in design, each with a forward projecting triangular shaped spine. Collectively, the triangular shaped extensions of the apical ring of scales surround a single emergent flagellum. Body scales resemble those of Mallomonas punctifera and M. transsylvanica in shape and general morphology, but differ in lacking distinct secondary ribbing on the shield. Mallomonas nieringii was found in six waterbodies all situated within a small geographic area on the outer tip of the Cape Cod peninsula.

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