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 2: Species with shells that are pyriform or elongate
Mazei Yuri, Warren Alan
We review the species of Difflugia with a shell that is pyriform or elongate, based primarily on examinations of two collections in the Natural History Museum, London, UK: (i) Penard’s collection of balsam-mounted microscope slides, and (ii) Ogden’s scanning electron micrographs and shell measurements. We discuss taxa grouped into seven species complexes, namely Difflugia oblonga Ehrenberg, 1838, Difflugia pyriformis Perty, 1849, Difflugia bryophila (Penard, 1902) Jung, 1942, Difflugia linearis (Penard, 1890) Gautier-Lièvre et Thomas, 1958, Difflugia gigantea (Chardez, 1967) Ogden et Fairman, 1979, Difflugia petricola Cash, 1909, and Difflugia lanceolata Penard, 1890. Within the D. oblonga-complex we: (i) distinguish as a separate taxon the typical form of D. oblonga Ehrenberg, 1838; (ii) synonymise D. parva (Thomas, 1954) Ogden, 1983, D. lacustris (Penard, 1899) Ogden, 1983, D. bacillifera Penard, 1890, D. oblonga var. incondita Gauthier-Lièvre et Thomas, 1958, and D. oblonga f. cyphodera Jung, 1942 with D. oblonga. Within the D. pyriformis-complex we: (i) distinguish as separate taxa the typical form of D. pyriformis Perty, 1849, as well as D. capreolata Penard, 1902, and (ii) synonymise D. cylindrus (Thomas, 1953) Ogden, 1983 with D. pyriformis Perty, 1849. Within the D. bryophila-complex we: (i) distinguish as a separate taxon D. bryophila (Penard, 1902) Jung, 1942, and (ii) synonymise D. gassowskii (Gassowsky, 1936) Ogden, 1983 with D. bryophila. Within the D. linearis-complex we: (i) distinguish as a separate taxon D. linearis (Penard, 1890) Gautier-Lièvre et Thomas, 1958, and (ii) synonymise D. paulii Ogden, 1983 and D. nebeloïdes Gauthier-Lièvre and Thomas, 1958 with D. linearis. Within the D. gigantea-complex we: (i) distinguish as a separate taxon the typical form of D. gigantea (Chardez, 1967) Ogden et Fairman, 1979, and (ii) discuss the validity of D. oblonga var. angusticollis Štěpánek, 1952, and D. oblonga var. stepaneki (Štěpánek, 1952) Decloitre. Within the D. petricola-complex we accept D. petricola Cash, 1909 as a valid species and suggest its possible relationships with other Difflugia species. Within the D. lanceolata-complex we accept D. lanceolata Penard, 1890 as a valid species and illustrate its variability based on C.G. Ogden’s SEM micrographs. As in the first part of this series of papers in which we taxonomically revise the genus Difflugia 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.
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Apolocystis perienteron sp. nov. (Apicomplexa: Monocystinae) a new aseptate gregarine from Pheretima californica (Annelida: Oligochaeta) from Egypt
Ramadan Nadia, Fawzy Samia, Ali Medhat, Nigm Ahmed
An acephaline gregarine Apolocystis perienteron sp. nov. is described from the coelomic cavity and intestinal coelomic epithelium of earthworms Pheretima californica. Young trophozoites resided inside the coelomic epithelium cells of the intestine. Adult trophozoites (48-72.5 µm in diameter) were found extracellular within coelomic cavity, or attached to either somatic or splanchnic epithelium. Gametocysts were 76-150 µm in minor diameter. Navicular sporocysts (17×10 µm) demonstrated slightly projected flat plugs. The most conspicuous features differentiating the new species from the congeners are encapsulations by the host amoebocytes throughout the gregarine lifespan, and tight attachment of the parasite to the epithelial layer of the host intestine (enteron).
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Spatial and temporal variability of phytoplankton at Jukrim-ri, Tongyeong-si, Korea
Huh Man Kyu
The study was described in the seasonal and spatial patterns of phytoplankton on the water surface and basal layer below the surface depths for seven stations at Jukrim-ri in Korea. Although this area was not wide, but the phytoplankton community was very diverse with 54 taxa identified, representing four classes. Diatoms (Bacillariophyceae) exhibited the greatest diversity with 38 taxa identified, followed by dinoflagellates (Dinophyceae, 12 taxa); Cryptophyceae with three taxa, and Eugenophyceae represented by a single taxon. Water surfaces were shown with the relative higher individual density or abundance across areas than those of basal layer. For the community as a whole, the values of ß-diversity for spatial variability were the lower than those of temporal variability. There was high taxonomic homogeneity of the phytoplankton community among four seasons. However, size distribution of abundance and biomass showed a statistically significant difference between south-north stations.