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Review of the Geographic Distribution of Diploid and Tetraploid Populations of the Odontophrynus Americanus Species Complex (Anura: Leptodactylidae)
It is indicated that there is a complex distribution pattern of populations of different ploidy, including areas of syntopy and sympatry, and cytogenetic variability, which could indicate the presence of more species, occurrence of auto and allopolyploidsy, and multiple origins of tetraploidy.
Meiotic effects of Robertsonian translocations in tuco-tucos of the Ctenomys perrensi superspecies (Rodentia: Ctenomyidae)
It was concluded that one or two Rb translocations in heterozygosis have weak direct effects on the fertility of the male carriers; therefore C. perrensi superspecies may be prone to maintain Rb chromosomal rearrangements.
Synaptic behaviour and morphological modifications of the X and Y chromosomes during pachytene in three species of Ctenomys (Rodentia, Caviomorpha, Ctenomyidae).
The implications of the peculiar synaptic behaviour displayed by sex chromosomes in C. perrensi, a species complex highly polymorphic for Robertsonian translocations, are discussed in relation to both the triggering of the pachytene checkpoint and the avoidance of non-homologous associations between sex chromosomes and the asynaptic pericentromeric regions of trivalents in translocation heterozygotes.
CYTOGENETICS AND REDESCRIPTION OF Graomys (RODENTIA, SIGMODONTINAE) FROM CHUMBICHA, CATAMARCA, ARGENTINA
The authors' results suggest that Chumbicha's specimens are conspecific with G. centralis, and other data of the genus suggest that the name G. chacoensis should be applied to specimens with 2n = 42.
Dry season diet composition of Eligmodontia moreni (Rodentia, Cricetidae, Sigmodontinae) in a hyper-arid region of the Monte desert (Mendoza, Argentina)
The diet of Eligmodontia moreni during a dry season in a hyper-arid region of the Monte desert shows a high flexibility in the diet, and this may be advantageous in these unpredictable environments.
Chromosome complement and meiosis in three species of the Neotropical bug genus Antiteuchus (Heteroptera, Pentatomidae, Discocephalinae)
The karyotype of Antiteuchus mixtus, A. sepulcralis and A. macraspis was described and illustrated and shown to have a long diffuse stage during meiotic prophase I and aberrant harlequin-type meiocytes and the chiasma frequency was analyzed for two of the three species studied.
Integrative taxonomy, systematics and distribution of the genus Eligmodontia (Rodentia, Cricetidae, Sigmodontinae) in the temperate Monte Desert of Argentina
To clarify the systematics of the species of silky mice occurring in the driest portion of the temperate Monte Desert in Argentina, qualitative and quantitative external and cranial characters, cytogenetics and molecular relationships, were studied and two centers of diversification are proposed to explain the evolution of Eligmodontia.
Chromosomal variation in Argentine populations of Akodon montensis Thomas, 1913 (Rodentia, Cricetidae, Sigmodontinae)
- M. Malleret, C. Labaroni, G. García, J. M. Ferro, D. A. Martí, C. Lanzone
- Biology, MedicineComparative cytogenetics
- 2 February 2016
Comparisons of cytogenetic data among populations of Argentina and Brazil showed the presence of high intraspecific variability in Akodon montensis and some differences among regions.
Distribution of Telomeric Sequences (TTAGGG)n in Rearranged Chromosomes of Phyllotine Rodents (Cricetidae, Sigmodontinae)
- C. Lanzone, C. Labaroni, Natalia Suárez, D. Rodriguez, M. Herrera, A. Bolzán
- Biology, MedicineCytogenetic and Genome Research
- 1 April 2016
The results suggest that ITS are important in the reshuffling of the highly derived karyotype of S. delicatus, and considering the phylogeny of phyllotines, the Robertsonian rearrangements of G. griseoflavus, E. puerulus, and E. morgani possibly represent chromosome fusions which have occurred independently.
Clues on Syntenic Relationship among Some Species of Oryzomyini and Akodontini Tribes (Rodentia: Sigmodontinae)
The finding of a set of such associations revealed by H. megacephalus chromosome probes provides phylogenetic information for both tribes and should improve knowledge about chromosome evolution in both these groups.