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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Russellia

Russellia Singh & Hanumaiah, 1979 (ref. ID; 7594)

Order Amoebida Kent, 1880: Family Hartmannellidae Volkonsky, 1931 emend. Singh, 1952 (ref. ID; 7594)

[ref. ID; 7594]
Definition; The resting nucleus contains a more or less central Feulgen-negative nucleolus. During mitosis the nucleolus disappears and a spindle with chromosomes arranged as an equatorial plate is formed. At late anaphase a non-chromatic 'corps intermediaire' is produced which also divides mitotically. Amoebae in locomotion flattened having thickened pellicle or dermal thickening. The outline of the amoebae may be oblong or oval. Sometimes the oblong forms are nearly fan-shaped. (ref. ID; 7594)
Notes; Houssay and Prenant (1970) have given a good description of the stages of nuclear division in R. sphaeronucleolus. At late anaphase they clearly demonstrated the formation of non-chromatic 'crops intermediaire'. It also divided mitotichally. Page's (1971) description of the stages of nuclear division in R. sphaeronucleolus is rather poor, and he was unable to find 'corps intermediaire' at late anaphase. Singh and Hanumaniah (1979) have confirmed the nuclear division findings of Houssay and Prenant (1970) in R. sphaeronucleolus. (ref. ID; 7594)
Type species; Russellia sphaeronucleolus (Greeff, 1891) (ref. ID; 7594)
  1. Russellia sphaeronucleolus (Greeff, 1891) (ref. ID; 7594)