The Afrotropical Drosophila montium subgroup: Balbiani ring 1 and polytene chromosomes of Drosophila nikananu.

Drosophila nikananu, an Afrotropical species, belongs to the montium subgroup of the melanogaster species. Photographic maps of the salivary gland chromosomes are presented, as well as data on their most prominent puffs during late larval and white prepupal development and, after in vitro ecdysone treatment, their reverse tandem duplications, and the well-formed Balbiani ring 1. The data are discussed and compared with those of other montium species.