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Cariologia de los Acridoideos Neotropicales: Estado Actual de su Conocimiento Y Nuevas Contribuciones

Cariologia de los Acridoideos Neotropicales: Estado Actual de su Conocimiento Y Nuevas... Abstract A list of chromosome numbers of neotropical Acridoidea as well as complementary information on chromosome morphology, sex mechanisms and ocurrence of polymorphisms, together with the correspondent bibliography, are provided. New informations on nearly two hundred species are also added. The study of approximately three hundred species shows that the neotropical species of the Roberts' (1941) Cryptosacci Group of Acridoidea have a basic karyotype of 2n = 23 (♂)-24 (♀). The amount of derived karyotypes due to structural rearrangements (about a third of the species) is not substantially different from acridoids of other faunas. Some groups appear particulary plastic as the Melanoplinae where in five related genera nearly two thirds of the 60 species studied show derived karyotypes. The XY (♂) and X1X2Y (♂) sex determining mechanisms are significantly more frequent in the neo-tropical species than in grasshoppers of other faunas. The present species of Ommexechidae derived from an old ancestral species where a pericentric inversion took place, increasing the N.F. (= « Nombre Fondamental ») to 25. In three of the nineteen species studied in this family, that karyotype was again substantially modified, reverting to a N.F. = 23 by means of a second pericentric inversion (two species) or by the dissociation of the submetacentric autosome (one species) increasing in this case, for the first time in Acridoidea, the chromosome number to 25. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Annales de la Société entomologique de France (N S ) Taylor & Francis

Cariologia de los Acridoideos Neotropicales: Estado Actual de su Conocimiento Y Nuevas Contribuciones

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Publisher
Taylor & Francis
Copyright
© 1982 Société entomologique de France
ISSN
2168-6351
eISSN
0037-9271
DOI
10.1080/21686351.1982.12278337
Publisher site
See Article on Publisher Site

Abstract

Abstract A list of chromosome numbers of neotropical Acridoidea as well as complementary information on chromosome morphology, sex mechanisms and ocurrence of polymorphisms, together with the correspondent bibliography, are provided. New informations on nearly two hundred species are also added. The study of approximately three hundred species shows that the neotropical species of the Roberts' (1941) Cryptosacci Group of Acridoidea have a basic karyotype of 2n = 23 (♂)-24 (♀). The amount of derived karyotypes due to structural rearrangements (about a third of the species) is not substantially different from acridoids of other faunas. Some groups appear particulary plastic as the Melanoplinae where in five related genera nearly two thirds of the 60 species studied show derived karyotypes. The XY (♂) and X1X2Y (♂) sex determining mechanisms are significantly more frequent in the neo-tropical species than in grasshoppers of other faunas. The present species of Ommexechidae derived from an old ancestral species where a pericentric inversion took place, increasing the N.F. (= « Nombre Fondamental ») to 25. In three of the nineteen species studied in this family, that karyotype was again substantially modified, reverting to a N.F. = 23 by means of a second pericentric inversion (two species) or by the dissociation of the submetacentric autosome (one species) increasing in this case, for the first time in Acridoidea, the chromosome number to 25.

Journal

Annales de la Société entomologique de France (N S ) – Taylor & Francis

Published: Oct 31, 1982

Keywords: Orthoptera; Acridoidea; néotropical; caryologie; nombre fondamental; évolution; polymorphisme

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