Resumo
A short, report on the chromosomes of three species of Brasilian Orthoptera is given in the present paper. Meroncidius intermedins Brunner, belonging to the Pseu-dophyllidae, differs from the species already studied in the Family in having 30 instead of 34 autosomes and a metacentric sex chromosome. "Of the autosomes, 4 showed to be metacentric. The author believes that the present species may be originated from one having 34 acrocentric autosomes by means of centric fusions. The origin of ths metacentricity of the X is not discussed. Oxyprora flavicornis Redtb.,belonging to the Copiphori-dae, has spermatogonia with 29 chromosomes. Of the autosomes, 4 seemed to be metacentric. The X has the form of a V of subae-qual arms. Neoconocephálus injuscatus (Scudd.), also belonging to the Copiphoridae, is provided with secondary spermatocytes of 13 -j- X and 13 chromosomes. The heterochromosome is metacentric. In the spermatogonia, whose chromosome number has not been counted, there are a lot of metacentric elements. In the opinion of the present writer species provided with 31, 33 and 35 chromosomes should exist in the Copiphoridae.
Escola Superior de Agricultura "Luiz de Queiroz" Universidade de S. Paulo
SUMMARY
A short, report on the chromosomes of three species of Brasilian Orthoptera is given in the present paper.
Meroncidius intermedins Brunner, belonging to the Pseu-dophyllidae, differs from the species already studied in the Family in having 30 instead of 34 autosomes and a metacentric sex chromosome. "Of the autosomes, 4 showed to be metacentric. The author believes that the present species may be originated from one having 34 acrocentric autosomes by means of centric fusions. The origin of ths metacentricity of the X is not discussed.
Oxyprora flavicornis Redtb.,belonging to the Copiphori-dae, has spermatogonia with 29 chromosomes. Of the autosomes, 4 seemed to be metacentric. The X has the form of a V of subae-qual arms.
Neoconocephálus injuscatus (Scudd.), also belonging to the Copiphoridae, is provided with secondary spermatocytes of 13 -j- X and 13 chromosomes. The heterochromosome is metacentric. In the spermatogonia, whose chromosome number has not been counted, there are a lot of metacentric elements. In the opinion of the present writer species provided with 31, 33 and 35 chromosomes should exist in the Copiphoridae.
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LITERATURA CITADA
- ASANA, J. J,S. MAKINO & H. NIIYAMA, 1938 - A chromosomal survey of some Indian insects. I -. Morphology of the chromosomes in eight species of the Locustidae. J. of the Fac. of Sc. Hokkaido Imp. Uni. Ser. IV, Zoology, 4 (3): 211-234.
- WHITE, M. J. D., 1941 - The evolution of the sex chromosomes. II The X-chromosome in the Tettigonidae and Acrididae and the principle of "Evolutionary Isolation" of the X. J. of Genetics, 42 (1-2): 173-190.
- WHITE, M. J. D., 1945 - Animal cytology and evolution. Cambridge Univ. Press. Vin-375 pgs.
- WOOLSEY, C, 1915 - Linkage of chromosomes correlated with reduction in numbers among the species in a genus, also within a species of the Locustidae. Biol Bul. 28: 163-187.
Nota sôbre cromossômios de alguns Ortópteros do Brasil
Datas de Publicação
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Publicação nesta coleção
06 Nov 2012 -
Data do Fascículo
1950
