Original paper

Freshwater Rhodomonads (Cryptophyceae)

Javornický, Pavel

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Algological Studies/Archiv für Hydrobiologie, Supplement Volumes No. 102 (2001), p. 93 - 116

30 references

published: Aug 1, 2001

DOI: 10.1127/algol_stud/102/2001/93

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Abstract

The concept of the genus Rhodomonas G. KARSTEN emend. W. ZIMMERMANN (or sensu lato), based upon light microscopy, is given and compared with some results of the electron microscopy. Specimens belonging to different species of the genus Rhodomonas sensu lato from the Vltava river (Czech Republic) and from several localities in north-eastern Germany, are pictured, described, and their taxonomic position is discussed. Rhodomonas rubra GEITLER and R. tenuis SKUJA are confirmed as distinct species. The first species was found in two varieties, differing by the shape of cell apex: Rhodomonas rubra GEITLER var. rubra, and R. rubra GEITLER var. nasica var. nova. R. radix species nova is newly described. The freshwater rhodomonads without gullet, with or without ventral furrow, but always with two or more vertical ventral rows of trichocysts, are classed with the marine genus Plagioselmis BUTCHER, as proposed by NOVARINO, LUCAS & MORRALL (1994). Their emendation of the genus, however, narrowing it to only the species with the hyaline posterior tail lacking the ultrastructure of periplast, is not adopted, and the wider concept of Plagioselmis as given by BUTCHER (1967) is preferred. Consequently, beside the combination Plagioselmis nannoplanctica (SKUJA) NOVARINO, LUCAS et MORRALL comb. et stat. nov., two new nomenclatural combinations for freshwater species are proposed in the present study: Plagioselmis lacustris (PASCHER et RUTTNER) comb. nova and Plagioselmis pygmaea (JAVORNICKV) comb. nova. A key to the identification of freshwater species of both Rhodomonas and Plagioselmis is given.

Keywords

Cryptophyceae • Rhodomonas • Plagioselmis • morphology • light microscopy • variability • taxonomy • new species and variety • new nomenclatural combinations