|Title: ||Cytotaxonomy of Simulium cauchense Floch & Abonnenc and Simulium quadrifidum Lutz (Diptera: Simuliidae) in Brazilian Amazonia|
|Authors: ||Alvan-Aguilar, Miriam Adriana|
Adler, Peter H.
Luz, Sérgio Luíz Bessa
|Keywords: ||Simulium (Psaroniocompsa) - polytene chromosomes - cytotaxonomy -
|Issue Date: ||31-Dec-2005|
|Publisher: ||Fundação Oswaldo Cruz, Fiocruz|
|Citation: ||Memórias do Instituto Oswaldo Cruz (ISSN: 1678-8060) Vol 100 Num 3|
|Abstract: ||Simulium cauchense Floch & Abonnenc and Simulium
quadrifidum Lutz are widely distributed in the Amazon region
and are morphologically similar at the larval and pupal stages.
Chromosomally, these species are readily distinguished by the position
of the nucleolar organizer, which is in the short arm of chromosome I
in S. cauchense and in the long arm of chromosomes III in S.
quadrifidum. They also differ by three fixed inversions. Sex
chromosomes are undifferentiated in both species. Chromosomal
resolution of the two species allowed us to evaluate four structural
features previously used as diagnostic aids at the larval stage.
Characters that distinguish larvae of the two species are the number of
branches and branching patterns of the dorsal abdominal setae and the
dark band on each primary fan. Branching patterns of the gill
histoblasts were often diagnostic, with S. quadrifidum exhibiting more
proximal branching and S. cauchense more distal branching. Sites where
both species occurred sometimes had larvae with one petiole branching
proximally and the other distally; in these cases examination of the
chromosomes permitted assignment of the specimen to species.
Pigmentation patterns of larvae, on the other hand, are highly
variable. Color typically is sex linked in both species.|
|Other Identifiers: ||http://www.bioline.org.br/abstract?id=oc05078|
|Rights: ||Copyright 2005 Instituto Oswaldo Cruz - Fiocruz|
|Appears in Collections:||Bioline International Legacy Collection|