Chromosome mapping in Abracris flavolineata (De Geer, 1773) (Orthoptera) from the Iguaçu National Park – Foz do Iguaçu, Paraná, Brazil

A cytomolecular analysis of Abracris flavolineata, conducted in Iguaçu National Park—a significant fragment of the Brazilian Atlantic Forest—reveals remarkable karyotypic plasticity in the species. The study identified a diploid number of 23 chromosomes in males (22+X0), with distinct heterochromatic blocks predominantly marked by DAPI+, alongside CMA3+ and dual DAPI+/CMA3+ regions, suggesting genetic diversity. Notably, 18S rDNA sites were mapped to the short arms of five chromosome pairs, with two co-located with 5S rDNA, while histone H3 genes were localized on a single bivalent. This plasticity is hypothesized to stem from vicariant events shaping the species' geographical distribution across populations.

Pine, M. B., Gallo, R. B., da Silva, C. R. M., Pezenti, L. F., De Domenico, F. C., Loreto, V., & da Rosa, R. (2017). Chromosome mapping in Abracris flavolineata (De Geer, 1773) (Orthoptera) from the Iguaçu National Park – Foz do Iguaçu, Paraná, Brazil. Comparative Cytogenetics, 11(2), 203–212. https://doi.org/10.3897/compcytogen.v11i2.10282