Uma nova modalidade de sexo-determinação no grilo sul-americano eneoptera surinamensis

The Role of the Kinetochore in Chromosome Organization

“…The same situation is to be found in Fritillaria meleagris, Tradescantia virginiana, Rhoeo discolor, Mecostethus grossus (Figs. 16,(41)(42)(43)(44)(45), and can be seen in the chromosome drawings of Culex pipiens ( CALLAN and MONTALENTI, 1947), Drosophila pseudoobscura (DARLINGTON, 1934), and Eneoptera surinamensis (PIZA, 1946).…”

Expanding the geographic cytogenetic studies in the bush crickets Eneoptera surinamensis (De Geer, 1773) (Orthoptera, Gryllidae, Eneopterinae) from Brazilian Atlantic and Amazon Forest

“…Eneoptera surinamensis have an extensive neotropical distribution (Robillard & Desutter-Grandcolas 2005), and individuals analyzed from Peru, Bolivia and Brazil (Claus 1956;Mesa & Bran 1964;Piza 1946) show asynaptic sex chromosomes, as well as some cells with incorrect sex chromosomes orientation along metaphase I to anaphase I (Piza 1946;Claus 1956;Mesa & Bran 1964).…”

“…Meiotic configuration on E. surinamensis germ cells, such as incorrect distribution of the sex chromosomes along the first meiotic division (Piza 1946;Claus 1956;Mesa & Bran 1964), is also common at X 1 X 2 Y sex system of some species of Mantodea (White 1941;1951), as well as in the acridid Ronderosia bergii (Stål, 1878) with neo-XY (Mesa 1962). This event added to our observations here described, such as the delay in the sex chromosomes migration along anaphase I/telophase I, as well as chromatin bridges may point out to production of unviable gametes, being related to low fertility.…”