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Description of a new species of the diatom genus Brachysira (Bacillariophyta), Brachysira gravida sp. nov. from the Ocala National Forest, Florida, U.S.A.

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The diatom Brachysira gravida Shayler & Siver sp. nov.is described from an oligotrophic, acidic, freshwater lake in the Ocala National Forest in north-central Florida, U.S.A. The richness of Brachysira was previously investigated to reveal that the genus is both abundant and morphologically diverse in this region of Florida and is therefore of particular taxonomic interest. Valves of Brachysira gravida are elliptical-rhombic with a swollen and rounded mid-region, concave margins that are not straight, and protracted rostrate apices. The combination of valve shape and size easily distinguish B. gravida as a distinct species, and provides a designation for several specimens previously published by other authors that could not be conclusively identified. Even though the new species has only been observed in one pond and from a nearby fossil deposit, it supports the concept that a relatively large number of unique and potentially endemic species of siliceous algae exist in the Ocala National Forest.
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Keywords: ANOMOEONEIS SENSU LATO; BRACHYSIRA; DIATOM MORPHOLOGY; FLORIDA; NATIONAL FOREST; OCALA; SPECIES RICHNESS; U.S.A.

Document Type: Research Article

Publication date: May 1, 2004

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  • Nova Hedwigia is an international journal publishing original, peer-reviewed papers on current issues of taxonomy, morphology, ultrastructure and ecology of all groups of cryptogamic plants, including cyanophytes/cyanobacteria and fungi. The half-tone plates in Nova Hedwigia are known for their high quality, which makes them especially suitable for the reproduction of photomicrographs and scanning and transmission electron micrographs.
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