Metaphase karyotypes of Anopheles of Thailand and Southeast Asia: IV. The Barbirostris and Umbrosus species Groups, subgenus Anopheles (Diptera: Culicidae)
Baimi, V.; Rattanarithikul, R.; Kijchalao, U.
Journal of the American Mosquito Control Association 11(3): 323-328
1995
ISSN/ISBN: 8756-971X PMID: 8551301 Document Number: 449665
Metaphase karyotypes of 2 and 3 species of the Umbrosus and the Barbirostris Groups, respectively, of the subgenus Anopheles occurring in Thailand and Indonesia show inter- and intraspecific differences with respect to the amount and distribution of constitutive heterochromatin in the sex chromosomes and/or autosomes. 4 forms of metaphase karyotypes have been recognized in the wild samples of Anopheles barbirostris based on differences in size and shape of X and Y chromosomes. It is not known whether forms A, B, and C of the metaphase karyotype of A. barbirostris found in Thailand represent inter- or intraspecific differences. However, form D, which occurs only in Indonesia, may represent a mitotic karyotype of a distinct species closely related to A. barbirostris. A. campestris and A. barbumbrosus are each readily separated from A. barbirostris by mitotic chromosomes. A. umbrosus and A. letifer of the Umbrosus Group also exhibit heterochromatin variation in the X chromosomes. These 2 species can be readily distinguished by the gross morphology of mitotic karyotypes, particularly the X and Y chromosomes.