| study of nucleolar behavior during spermatogenesis in martarega brasiliensis (heteroptera, notonectidae). | few cytogenetic studies have been undertaken using aquatic heteropterans and the nucleolar behavior of these insects has been described in only four species, limnogonus aduncus, brachymetra albinerva, halobatopsis platensis, and cylindrostethus palmaris. the nucleolus is a cellular structure related to biosynthetic activity and it exhibits a peculiar behavior in the heteropterans of the triatominae subfamily; it persists during all stages of meiosis. thus, this study aims to analyze spermatogene ... | 2015 | 26345830 |
| cytogenetics analysis and testis morphology of aquatic species of the families belostomatidae, gelastocoridae, gerridae, notonectidae, and veliidae (heteroptera). | the heteroptera have holocentric chromosomes with kinetic activity restricted to the end of chromosomes. the first meiotic division is reductional for the autosomes and equational for the sexual. only a few species of this suborder have been analyzed. in this study, we observed the morphologies of the testes of the heteroptera species belostoma anurum (herrich-schäffer, 1948), belostoma micantulum (stal, 1858), gelastocoris angulatus (melin, 1929), gelastocoris flavus flavus (guérin-méneville, 1 ... | 2015 | 25797798 |
| the first assess of the haplotypes from coi gene sequences in species of spittlebugs (cicadomorpha: hemiptera) and aquatic true bugs (gerromorpha and nepomorpha: hemiptera) in brazil. | we made the first analysis of the coi gene sequences of 22 species of spittlebugs and aquatic true bugs sampled in são paulo state (brazil) and used this information to determine the variability within these groups. considering each codon position, we observed that the third base was the most variable, and the first base was the most conserved. among species, mahanarva fimbriolata and deois flavopicta had the greatest genetic distance (0.181), and notozulia entreriana and mahanarva sp had the sm ... | 2013 | 24301909 |