title: Cytogenetics of four species of Spirostreptidae (Diplopoda, Spirostreptida).
abstract: Considering an estimated number of millipedes of approximately 80,000, cytogenetic studies on these animals are rare, as only a total of 70 species have their karyotypes described. The present study reports on the chromosomal number of four Brazilian diplopods of the family Spirostreptidae: Urostreptus atrobrunneus with 2n=24, XY; Gymnostreptus olivaceus 2n=12, XY and Alloporus araraquarensis and A. principes, 2n=18, XY. The C-banding pattern and NOR staining of U. atrobrunneus, G. olivaceus and A. araraquarensis are described.
authors.affiliation: Department of Biology, São Paulo State University (UNESP), Bioscience Institute (IB), Av. 24A, No. 1515, Bela Vista, 13506-900 Rio Claro, São Paulo, Brazil.
authors.forename: Juliana Aparecida Preto
authors.initials: JA
authors.lastname: de Godoy
authors.forename: Pedro Henrique Braga
authors.initials: PH
authors.lastname: Pierozzi
authors.forename: Carmem Silvia
authors.initials: CS
authors.lastname: Fontanetti
mesh_terms: D000818:Animals; D001181:Arthropods / Q000145:classification / Q000235:genetics*; D002871:Chromosome Banding; D003582:Cytogenetics; D006570:Heterochromatin / Q000648:ultrastructure; D009697:Nucleolus Organizer Region; D019849:Sex Determination Processes
chemical_list: D006570:Heterochromatin