A comparative study of the chromosomes of eight genera of Indian pyrgomorphinae (Acrididae)

Rao, T. Ramachandra (1937) A comparative study of the chromosomes of eight genera of Indian pyrgomorphinae (Acrididae). Journal of Morphology, 61 (2). pp. 223-255.

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"In the spermatogonia of all the genera studied, there are nineteen rod-shaped telomitic chromosomes, which differ considerably regarding their actual sizes in the different genera. However, an analysis of the measurements of second spermatocyte chromosomes shows that as regards proportional sizes and in seriation there is some degree of uniformity within the sub-family. In Aularches, Atractomorpha, Chrotogonus, Colemania and Pyrgomorpha, the members of the smallest pair of autosomes appear as roundish or oval bodies and are comparable in shape, relative size and behavior with the small dot-like chromosomes of the general Acrididae, while in Orthacris and Zarytes they are not so and merge into the general series. The sex chromosome is the largest one in the complexes, or the second largest as in Poecilocerus. The usual forms of tetrads occur in the spermatocytes. It is found that the number of ring tetrads in any genus depends upon the length of its chromosomes; in genera with longer chromosomes there are more of them than in genera with shorter ones. While no final explanation has been offered regarding the chromosome relationship between this sub-family and the other Acrididae, some points arising out of the present study have been briefly discussed, and it is shown that a simple process of elimination of two pairs is not sufficient to explain the smaller chromosome number in Pyrgomorphinae.

Item Type: Article
Additional Information: Place: United States of America Publisher: John Wiley and Sons, Ltd
Uncontrolled Keywords: Pyrgomorphinae and Acrididae and Spermatocyte Chromosomes and Relative Sizes and Sex Chromosomes and Chromosome Number and Spermatogonia
Subjects: B Life Science > Zoology
Divisions: Department of > Zoology
Depositing User: Dhruva Kumar
Date Deposited: 08 May 2021 15:16
Last Modified: 08 May 2021 15:16
URI: http://eprints.uni-mysore.ac.in/id/eprint/12270

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