New paper!

Milani D. et al.: "Variable organization of repeats and hidden diversity of XY sex chromosomes in Pentatomidae true Bugs (Hemiptera) revealed through comparative genomic hybridization".

Sex chromosomes have independently evolved in various species, displaying unique evolutionary patterns, including differentiation, degeneration, and repetitive DNA accumulation. Pentatomidae hemipterans are characterized by a highly conserved diploid number of 2n = 14 with a XX/XY sex chromosome system, i.e. 2n = 14, 12 A + XY. Thus, it represents an interesting group for investigating the reorganization of repeats in conserved karyotypes, i.e. the absence of large chromosomal rearrangements. Using comparative genomic hybridization (CGH) with male and female genomic DNAs (gDNA), this study examined a total of 25 Pentatomidae species to uncover repetitive DNA dynamics and their role in chromosome differentiation, especially sex chromosome differentiation. New karyotype data for nine species reinforces the chromosomal stasis in Pentatomidae for macro-chromosomal structure. However, significant variability in repetitive DNA patterns on autosomes and sex chromosomes has been revealed despite the karyotypic conservation. Autosomal signals varied in intensity and distribution, with some species exhibiting terminal enrichment of repeats, while others displayed dispersed patterns. Sex chromosomes showed distinct hybridization patterns, with the Y chromosome exhibiting more significant variability compared to the X. These findings emphasize the dynamic nature of sex chromosomes and suggest further studies combining genomic sequencing and cytogenetics to uncover sequences and the mechanisms behind their evolution.

https://link.springer.com/article/10.1007/s00412-025-00831-7

New paper!

Lu Y. et al.: "Phylogenomics of the superfamily Lygaeoidea with proposals on taxonomic system (Hemiptera: Heteroptera)".

Lygaeoidea, one of the largest superfamilies of the true bugs (Hemiptera: Heteroptera), currently comprises 16 families and exhibits abundant diversification in habitats, body plans, and feeding habits. The relationships within this superfamily are complex, and comprehensive molecular phylogenetic studies, particularly those focusing on subfamilies and tribes within Rhyparochromidae, have been lacking. In the present study, we sampled 125 lygaeoid species representing all 16 families of Lygaeoidea, with a focus on two subfamilies and 12 tribes within Rhyparochromidae. A phylogenetic dataset with 102 genes was assembled, including two nuclear rRNA genes (18S rDNA, 28S rDNA), two mitochondrial rRNA genes (12S rDNA, 16S rDNA), 13 mitochondrial protein-coding genes (PCGs) and 85 nuclear PCGs generated from the low-coverage genomes. Our inferences indicate that Rhyparochromidae is not monophyletic, with one subfamily, one tribe, and one genus deserving elevation to the rank of family. Additionally, this phylogenetic result is also supported by corresponding morphological evidence. Besides, the transfer of the Heissothignus from Heterogastridae to Meschiidae is supported by molecular evidence in this study.

https://www.sciencedirect.com/science/article/pii/S1055790325000739?via%3Dihub

New paper!

Gierlasiński G. et al.: "Notes on plant bugs from New Caledonia with descriptions of two new species of the genus Bolbomiris (Hemiptera: Heteroptera: Miridae)".

Two new species of Bolbomiris Hosseini & Cassis, 2019, B. picpinensis Gierlasiński & Taszakowski sp. nov. and B. koghi Gierlasiński & Taszakowski sp. nov., are diagnosed and described. Photographic images of habitus and male genital structures, as well as scanning electron micrographs of selected structures of these species, are provided. An updated key to the species of Bolbomiris is presented. Additionally, the paper also presents new localities of Bolbomiris cola Hosseini & Cassis, 2019, Bolbomiris samuelsoni Hosseini & Cassis, 2019, as well as Peritropis bicolor Gorczyca, 1999 and Kanakamiris krypton Cassis & Monteith, 2006 (Cylapinae), Fingulus novocaledonicus Stonedahl & Cassis, 1991 (Deraeocorinae), and Coridromius variegatus (Montrouzier, 1861) (Orthotylinae). The occurrence of scopula in Bolbomiris and other plant bugs is briefly discussed.

https://www.aemnp.eu/acta-entomologica/volume-65-1/2007/notes-on-plant-bugs-from-new-caledonia-with-descriptions-of-two-new-species-of-the-genus-bolbomiris-hemiptera-heteroptera-miridae.html