ArgynniaRalf Meisterfeld and Edward Mitchell
Shell compressed, aperture surrounded by siliceous plates, giving it a rough outline. Shell greyish, composed of various euglyphid plates, mixed with diatom fragments and mineral particles, porous cement. The structure of the test is intermediate between Nebela and Difflugia. Nucleus: ovular. This genus was proposed by Jung (1942b) without type designation and validated by Vucetich (1974) including only three species from the southern hemisphere. Type species: Argynnia schwabei. Here Argynnia is used in a less restricted sense to allow for common and better known species with similar test structure, such as Argynnia dentistoma (Penard, 1890) (Synonym: N. dentistoma). Used in this broader sense Argynnia has about fifteen species.
In an analysis of the SSU rRNA gene of several species of the family Hyalospheniidae, where Argynnia has traditionally been placed, Lara et al. (2008) could show that Argynnia dentistoma is not directly related to the "core Nebela". Until other species and genes have been studied with molecular methods the position of the genus remains uncertain.
Habitat: A. dentistoma is common in mosses like Sphagnum or in acid humus, other species live in freshwater sediments.
Deflandre, G. 1936. Etude monographique sur le genre Nebela Leidy (Rhizopoda - Testacea). Ann. Protistol., 5:201-286.
Lara, E.; Heger, T.J.; Ekelund, F.; Lamentowicz, M. & Mitchell, E.A.D. 2008, Ribosomal RNA Genes Challenge the Monophyly of the Hyalospheniidae (Amoebozoa: Arcellinida). Protist, 159: 165 176.
Ogden, C. G. & Hedley, R. H. 1980. An Atlas of Freshwater Testate Amoebae. Oxford University Press, Oxford.
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University of Neuchâtel
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- First online 02 September 2008
- Content changed 02 September 2008
Citing this page:
Meisterfeld, Ralf and Edward Mitchell. 2008. Argynnia http://tolweb.org/Argynnia/124540/2008.09.02 in The Tree of Life Web Project, http://tolweb.org/. Version 02 September 2008 (under construction).