| 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 |
| new records of gerromorpha and nepomorpha (insecta: hemiptera: heteroptera) from south america. | aquatic and semiaquatic heteroptera occur on all continents except antarctica and occupy a wide variety of habitats, including lentic and lotic water bodies, perennial or temporary. in the neotropical region, there is a lack of knowledge concerning the geographical distribution of most represented species, which can only be solved by the collection of specimens in under-studied areas and publication of new records and lists of species. | 2016 | 27226754 |
| spermatogenesis and karyotypes of three species of water striders (gerridae, heteroptera). | although they are of economic importance, there have been few cytogenetic studies of the gerridae (heteroptera) in brazil. we examined spermatogenesis (meiosis and spermiogenesis) and nucleolar behavior in three species of the family gerridae. brachymetra albinerva and halobatopsis platensis were found to have a chromosome complement of 2n = 25 (24a + x0) and cylindrostethus palmaris 2n = 29 (28a + x0) chromosomes. fifteen individuals of these species were collected from the reservoir of são jos ... | 2010 | 20645259 |
| 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 |