A survey of the testate amoeba genus Difflugia Leclerc, 1815 based on specimens in the E. Penard and C. G. Ogden collections of the natural History Museum, London. Part 1: species with shells that are pointed aborally and/or have aboral protuberances

Autor: Yuri Mazei, Warren, Alan
Jazyk: ruština
Rok vydání: 2012
Zdroj: Yuri Mazei
ResearcherID
ISSN: 1680-0826
Popis: We review the species of Difflugia with a shell that is pointed aborally and/or has aboral protuberances, based primarily on examinations of two collections in the Natural History Museum, London, UK: (i) Penard’s collection of balsammounted microscope slides, and; (ii) Ogden’s scanning electron micrographs and shell measurements. We discuss Difflugia taxa grouped into five species complexes, namely D. acuminata Ehrenberg, 1838, D. bacillariarum Perty, 1849, D. elegans Penard, 1890, D. claviformis (Penard, 1899) Ogden, 1979, and D. scalpellum Penard, 1899. Within the D. acuminata-complex we: (i) distinguish as separate taxa the typical form of D. acuminata Ehrenberg, 1838, as well as D. acuminata var. magna Deflandre, 1926, D. giganteacuminata (Chardez, 1958) Chardez et Gaspar, 1984, and D. distenda (Penard, 1899) Ogden, 1983; (ii) synonymise D. aciminata var. umbilicata Penard, 1902, D. curvicaulis Penard, 1899, and D. venusta (Penard, 1902) Ogden, 1983 with D. acuminata; D. congolensis Gauthier-Lièvre et Thomas, 1958 with D. acuminata var. magna; D. bicruris Gauthier-Lièvre et Thomas, 1958 with D. distenda, and; (iii) discuss the validity of D. ventricosa Deflandre, 1926 and D. acutissima Deflandre, 1931. Within the D. bacillariarum-complex we: (i) distinguish as a separate taxon the typical form of D. bacillariarum Perty, 1849, and; (ii) synonymise D. bicornis Penard, 1890, D. styla Ogden et Živković, 1983 and D. australis var. minor Gautier-Lièvre et Thomas, 1958 with D. bacillariarum. Within the D. elegans-complex we: (i) distinguish as a separate taxon D. elegans Penard, 1890, and provide an improved diagnosis that includes the variability in the appearance and number of horns; (ii) synonymise D. amphoralis Hopkinson, 1909, D. tricornis (Jung, 1936) Ogden, 1983, D. elegans f. tricornis Jung, 1936, D. elegans f. bicornis Jung, 1936, D. australis (Playfair, 1918) Gautier-Lièvre et Thomas, 1958, D. solowetskii Mereschkowsky, 1877, D. varians Penard, 1902, D. leidyi Wailes, 1912, D. borodini Gassowsky, 1936, and D. juzephiniensis Dekhtyar, 1993 with D. elegans, and; (iii) discuss the validity of D. elegans var. teres Penard, 1899 and D. elegans var. angustata Deflandre, 1926. Within the D. claviformis-complex we: (i) distinguish as a separate taxa D. claviformis (Penard, 1899) Ogden, 1979 and D. microclaviformis (Kourova, 1925) Ogden, 1983, and; (ii) synonymise D. pyriformis var. venusta Penard, 1902 with D. microclaviformis (Kourova, 1925) Ogden, 1983. Within the D. scalpellum-complex we: (i) distinguish as a separate taxon D. scalpellum Penard, 1899, and; (ii) discuss the validity of D. præstans Penard, 1905, D. smilion Thomas, 1953, and D. sarissa Li Sun Taï, 1931. We conclude that, based on current knowledge, it is unclear whether these species complexes represent single, highly polymorphic species, or groups of sibling species. Further studies based on a combination of morphometric, ultrastructural (SEM), molecular, and environmental data are needed in order to characterize these species complexes in more detail and thus resolve their systematics.
Databáze: OpenAIRE
Externí odkaz: