Lygaeidae

Study of chromosomal and nucleolar aspects in testes of Nysius californicus (Heteroptera: Lygaeidae)

H. V. Souza, Bicudo, H. E. M. C., and Itoyama, M. M., Study of chromosomal and nucleolar aspects in testes of Nysius californicus (Heteroptera: Lygaeidae), vol. 6, pp. 33-40, 2007.

In Nysius californicus (family Lygaeidae, subfamily Orsillinae), a pest commonly known as the seed bug, the chromosome complement is 2n = 16 (12A + 2m + XY), testes are formed by seven seminiferous tubules covered by an orange-colored membrane, and spermatogenesis is cystic. At prophase, sex chromosomes are heteropycnotic and autosomes usually show a chiasma. At metaphase, sex chromosomes along with microchromosomes may be seen located at the center of a ring formed by the remaining autosomes. A characteristic specific of N.

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