Stingless bee

Genetic variability in Melipona quinquefasciata (Hymenoptera, Apidae, Meliponini) from northeastern Brazil determined using the first internal transcribed spacer (ITS1)

J. O. P. Pereira, Freitas, B. M., Jorge, D. M. M., Torres, D. C., Soares, C. E. A., and Grangeiro, T. B., Genetic variability in Melipona quinquefasciata (Hymenoptera, Apidae, Meliponini) from northeastern Brazil determined using the first internal transcribed spacer (ITS1), vol. 8, pp. 641-648, 2009.

Melipona quinquefasciata is a ground-nesting South American stingless bee whose geographic distribution was believed to comprise only the central and southern states of Brazil. We obtained partial sequences (about 500-570 bp) of first internal transcribed spacer (ITS1) nuclear ribosomal DNA from Melipona specimens putatively identified as M. quinquefasciata collected from different localities in northeastern Brazil.

Occurrence of multiple nucleolus organizer regions and intraspecific karyotype variation in Scaptotrigona xanthotricha Moure (Hymenoptera, Meliponini)

O. M. P. Duarte, Martins, C. C. C., Waldschmidt, A. M., and Costa, M. A., Occurrence of multiple nucleolus organizer regions and intraspecific karyotype variation in Scaptotrigona xanthotricha Moure (Hymenoptera, Meliponini), vol. 8, pp. 831-839, 2009.

Scaptotrigona xanthotricha has a wide geographic distribution in the Brazilian Atlantic rainforest. One population from southeast and two from northeast Brazil were analyzed and were found to have chromosome polymorphisms. Although the chromo­some number 2n = 34 is conserved in this species, karyotypic analy­sis revealed clear differences between the three populations. Congru­ent and ubiquitous multiple nucleolus organizer regions, heterochro­matin and CMA3-positive blocks were found.

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