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First contribution to the cytogenetics of Brazilian psocoptera

Alejo Mesa; Carmen Silvia Fontanetti; Edison Zefa

Departamento de Genética, Instituto de Biociências de Rio Claro, UNESP, 13500 Rio Claro, SP, Brasil. Send correspondence to A.M.

ABSTRACT

Two Brazilian species of Psocoptera (Insecta), Cerastipsocus fuscipennis and Seopsocus acuminatus Roesler, were studied cytogenetically. Both species present 2n - 17 (male) - 18 (female), the same karyotype as that found for the majority of other species in the order. During first prophase, in many nuclei of C. fuscipennis the X chromosome is divided into two segments that join in a single block during first metaphase. The data reported here represent the first cytogenetic information about Brazilian Psocoptera.

Keywords: Cytogenetics; Brazilian Psocoptera.

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