Cytogenetics of Strumigenys louisianae Roger, 1863 (Formicidae: Myrmicinae) from North-eastern Amazonia shed light on a difficult species complex

Barros, Luísa Antônia Campos; Chaul, Júlio Cézar Mário; Orivel, Jérôme; Aguiar, Hilton Jeferson Alves Cardoso de

doi:10.1016/j.jcz.2021.07.012

Cited by 10 publications

(3 citation statements)

References 37 publications

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“…This preliminary survey seems to align with morphological studies that hypothesize a species complex within C. rimosus [Kempf, 1966;Snelling and Longino, 1992;Albuquerque, 2014]. Cytogenetic studies contrasting different populations or samples from different localities are scarce for several ant subfamilies [Barros et al, 2021;Micolino et al, 2022]. The geographical approach has highlighted a high karyotypic variability among ant species from distinct localities, suggesting the presence of species complexes, like those observed in the attine ant Mycetophylax morschi (Emery, 1888) [Micolino et al, 2019a].…”

Section: Discussionsupporting

confidence: 78%

“…Several studies using cytogenetic approaches in Formicidae have provided useful information for elucidating taxonomic issues, highlighting notable chromosomal differences in species complexes and cryptic species [Imai et al, 1994;Mariano et al, 2012;Micolino et al, 2019a). For example, Strumigenys louisianae Roger, 1863 ants from two Brazilian biomes, the Atlantic and Amazon rainforests, showed contrasting karyotypes with chromosome numbers 2n = 4 and 2n = 26, respectively [reviewed in Barros et al, 2021], corroborating the existence of a species complex in this taxon, according to previous morphological data [Bolton, 2000].…”

Section: Introductionmentioning

confidence: 99%

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Cytogenetic Analysis of the Fungus-Farming Ant Cyphomyrmex rimosus (Spinola, 1851) (Formicidae: Myrmicinae: Attini) Highlights Karyotypic Variation

Teixeira¹,

Jacintho²,

Aguiar³

et al. 2022

Cytogenet Genome Res

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The fungus-farming ant genus Cyphomyrmex (subtribe Attina, clade Neoattina) comprises 23 described species that are widely distributed throughout the Neotropics. Species within Cyphomyrmex have taxonomic issues such as Cyphomyrmex rimosus (Spinola, 1851) which is likely a species complex. Cytogenetics is a useful tool for evolutionary studies and understanding species with dubious taxonomy. In this study, we characterized the karyotype of C. rimosus from Viçosa, Minas Gerais state, southeastern Brazil using classical and molecular cytogenetic techniques to enrich the chromosomal information about Cyphomyrmex. The karyotype of C. rimosus from the rainforest of southeastern Brazil (2n = 22, 18m + 4sm) notably contrasts with that previously described for this species in Panama (2n = 32). This intraspecific chromosomal variation suggests the existence of a species complex within this taxon according to the previous hypothesis derived from morphological analysis. We detected GC-rich heterochromatic regions in C. rimosus and using repetitive DNA probes showed that this heterochromatin shares repetitive sequences with other Neoattina species already studied, enhancing the importance of this specific genome region in the understanding of Attina evolution. Mapping of microsatellite (GA)15 on C. rimosus was restricted to the euchromatic regions of all chromosomes. The single intrachromosomal rDNA sites observed in C. rimosus follow the general genomic organization trend of ribosomal genes in Formicidae. Our study extends the data of chromosome mapping on Cyphomyrmex and reinforces the importance of cytogenetic studies in different localities to better understand taxonomic issues in widely distributed taxa such as C. rimosus.

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Section: Discussionsupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Cytogenetic Analysis of the Fungus-Farming Ant Cyphomyrmex rimosus (Spinola, 1851) (Formicidae: Myrmicinae: Attini) Highlights Karyotypic Variation

Teixeira¹,

Jacintho²,

Aguiar³

et al. 2022

Cytogenet Genome Res

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“…In Formicidae , molecular cytogenetic studies involving fluorescence in situ hybridization ( FISH ) for physical mapping of major ribosomal genes, 45S ribosomal DNA ( rDNA ), here referred to as rDNA clusters, were first conducted in Australian ants of the genus Myrmecia Fabricius, 1804 ( Imai et al 1992 ; Hirai et al 1994 , 1996 ). In recent years, FISH has been widely employed in several ant species, particularly in the Neotropical region ( Santos et al 2016 ; Aguiar et al 2017 ; Micolino et al 2019 , 2022 ; Barros et al 2021a , b , 2022a , b ; Murakami et al 2021 ; Silveira 2022 ; Teixeira et al 2022 , 2023 ; Jacintho et al 2023 ). These molecular cytogenetic studies have provided valuable insights into various biological aspects of these insects, including evolution, taxonomy, and reproduction.…”

Section: Introductionmentioning

confidence: 99%

Physical chromosomal mapping of major ribosomal genes in 15 ant species with a review of hypotheses regarding evolution of the number and position of NORs in ants

Damasceno,

Teixeira,

Ferreira

et al. 2024

CCG

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Recently, hypotheses regarding the evolutionary patterns of ribosomal genes in ant chromosomes have been under discussion. One of these hypotheses proposes a relationship between chromosomal location and the number of rDNA sites, suggesting that terminal locations facilitate the dispersion of rDNA clusters through ectopic recombination during meiosis, while intrachromosomal locations restrict them to a single chromosome pair. Another hypothesis suggests that the multiplication of rDNA sites could be associated with an increase in the chromosome number in Hymenoptera due to chromosomal fissions. In this study, we physically mapped rDNA sites in 15 new ant species and also reviewed data on rDNA available since the revision by Teixeira et al. (2021a). Our objectives were to investigate whether the new data confirm the relationship between chromosomal location and the number of rDNA sites, and whether the increase in the chromosome number is significant in the dispersion of rDNA clusters in ant karyotypes. Combining our new data with all information on ant cytogenetics published after 2021, 40 new species and nine new genera were assembled. Most species exhibited intrachromosomal rDNA sites on a single chromosome pair, while three species showed these genes in terminal regions of multiple chromosome pairs. On one hand, the hypothesis that the chromosomal location of rDNA clusters may facilitate the dispersion of rDNA sites in the ant genome, as previously discussed, was strengthened, but, on the other hand, the hypothesis of chromosomal fission as the main mechanism for dispersion of ribosomal genes in ants is likely to be refuted. Furthermore, in certain genera, the location of rDNA sites remained similar among the species studied, whereas in others, the distribution of these genes showed significant variation between species, suggesting a more dynamic chromosomal evolution.

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New patterns of polymorphism in the karyotypic analysis of the genus Plebeia (Hymenoptera, Apidae)

Campos,

Teixeira,

Lopes

et al. 2024

Apidologie

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Cytogenetics of Strumigenys louisianae Roger, 1863 (Formicidae: Myrmicinae) from North-eastern Amazonia shed light on a difficult species complex

Cited by 10 publications

References 37 publications

Cytogenetic Analysis of the Fungus-Farming Ant Cyphomyrmex rimosus (Spinola, 1851) (Formicidae: Myrmicinae: Attini) Highlights Karyotypic Variation

Cytogenetic Analysis of the Fungus-Farming Ant Cyphomyrmex rimosus (Spinola, 1851) (Formicidae: Myrmicinae: Attini) Highlights Karyotypic Variation

Physical chromosomal mapping of major ribosomal genes in 15 ant species with a review of hypotheses regarding evolution of the number and position of NORs in ants

New patterns of polymorphism in the karyotypic analysis of the genus Plebeia (Hymenoptera, Apidae)

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