Taxonomic appraisal of Melosira arctica Dickie and description of a new variety (Bacillariophyta)
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Irena Kaczmarska
Abstract
Original material of Melosira arctica was examined. Species circumscription is emended to include detailed frustule fine structure and, for the first time, the basic morphometrics of the population from original material have been established using light and electron microscopy. This original population, collected in 1850, was compared to three contemporary populations of this taxon, collected at Arctic Ocean stations ranging from latitude of 71° to 76° N and from longitude 77° to 173° W. As a result of morphometric examination, a new variety, M. arctica var. krembsii, is proposed. The new variety differs from the nominate variety by finer perforation of the valvocopulae, by fewer marginal rimoportulae in 10 μm located further above the mantle margin, by fewer rimoportulae on the valve face, and by finer striation of the valves. Based on published illustrations, we suggest that M. arctica var. krembsii may be more common at latitudes south of 70° N, while the nominate variety occurs in more polar seas.
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- A re-evaluation of the taxonomic status of Halophila euphlebia Makino (Hydrocharitaceae) based on morphological features and ITS sequence data
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- Taxonomic appraisal of Melosira arctica Dickie and description of a new variety (Bacillariophyta)
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Articles in the same Issue
- Sulfur cycling and sulfide intrusion in mixed Southeast Asian tropical seagrass meadows
- Variability of Ruppia cirrhosa in two coastal lagoons with differing anthropogenic stresses
- A re-evaluation of the taxonomic status of Halophila euphlebia Makino (Hydrocharitaceae) based on morphological features and ITS sequence data
- Ganonema vermiculare sp. nov. (Liagoraceae, Rhodophyta), a new species from Puerto Rico, Caribbean Sea
- Antithamnionella multiglandulosa sp. nov. (Rhodophyta, Ceramiaceae) from the Atlantic Iberian Peninsula
- Changes in the benthic algal flora of Linosa Island (Straits of Sicily, Mediterranean Sea)
- Seasonal and spatial dynamics of Noctiluca scintillans in a semi-enclosed bay in the northeastern part of Hong Kong
- Taxonomic appraisal of Melosira arctica Dickie and description of a new variety (Bacillariophyta)
- Changes in growth, chlorophyll fluorescence and fatty acid composition with culture age in batch cultures of Phaeodactylum tricornutum and Chaetoceros muelleri (Bacillariophyceae)
- Purification and some properties of a d-fructose-1,6-bisphosphate aldolase from the red alga, Gracilaria chorda Holmes
- Biomass and docosahexaenoic acid formation by Schizochytrium mangrovei Sk-02 at low salt concentrations
