Ref ID : 7594
B.N. Singh, R. Misra, and A.K. Sharma; Nuclear Structure and Nuclear Division as the Basis for the Subdivision of the Genus Thecamoeba Fromental, 1874. Protistologica XVII(4):449-464, 1981
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Nuclear division in four species of thecamoebae, whose mitotic patterns are not known, obtained in clonal cultures from Indian soils, by a culture method that enables specimens in different stages of mitosis to be obtained easily, had been studied. Based on the stable characters of the structure of the resting nucleus and mitotic patterns of thecamoebea, the genus Thecamoeba Fromental, 1874, has been subdivised into the following eight genera: Thecamoeba Fromental emend. Auctt., type species T. verrucosa (Ehrenberg, 1838), Greeffia Singh and Hanumaiah, 1979, type species G. similis (Greeff, 1891), Bawdenium n. g., type species B. terricola (Greeff, 1866), Thorntonius n. g., type species T. quadrilineata (Carter, 1856), Carteria Singh and Hanumaiah, 1979, type species C. orbis (Schaeffer, 1926), Russellia Singh and Hanumaiah, 1979, type species R. sphaeronucleolus (Greeff, 1891), Cutleria Singh and Hanumaiah, 1979, type species C. striata (Penard, 1890) and Sahnium n. g., type species S. lucknowensis n. sp. Carteria bengaliensis n.sp. has been described. Four of the former genera have been placed in the family Schizopyrenidae Singh, 1952 emend. Singh and Das, 1970, and the latter four in the family Hartmannellidae Volkonsky, 1931 emend. Singh, 1952, based on their two distinct types of mitotic patterns in the order Amoebida Kent, 1880. The bearing of nuclear division on the possible evolution of thecamoebae has been discussed.