title: Surviving in sympatry: paragenital divergence and sexual mimicry between a pair of traumatically inseminating plant bugs.
abstract: Reproductive interactions between species can carry significant costs (e.g., wasted time, energy, and gametes). In traumatically inseminating insects, heterospecific mating costs may be intensified, with indiscriminate mating and damaging genitalia leading to damage or death. When closely related traumatically inseminating species are sympatric, we predict selection should favor the rapid evolution of reproductive isolation. Here we report on a cryptic species of traumatically inseminating plant bug, Coridromius taravao, living sympatrically with its sister species, Coridromius tahitiensis, in French Polynesia. Despite their sister-species relationship, they exhibit striking differences in reproductive morphology, with females of each species stabbed and inseminated through different parts of their abdomens. Furthermore, C. tahitiensis is sexually dimorphic in coloration and vestiture, while both sexes of C. taravao share the C. tahitiensis male expression of these traits. These findings support a role for (1) reproductive character divergence and (2) interspecies sexual mimicry in limiting interspecific mating brought about by indiscriminate male mating behavior.
authors.affiliation: Evolution and Ecology Research Centre, School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney, New South Wales, Australia.
authors.forename: Nikolai J
authors.initials: NJ
authors.lastname: Tatarnic
authors.forename: Gerasimos
authors.initials: G
authors.lastname: Cassis
mesh_terms: D000818:Animals; D003576:Electron Transport Complex IV / Q000235:genetics / Q000378:metabolism; D005260:Female; D049810:Genetic Speciation; D005835:Genitalia / Q000033:anatomy & histology; D020062:Heteroptera / Q000033:anatomy & histology / Q000145:classification / Q000235:genetics / Q000502:physiology*; D019476:Insect Proteins / Q000235:genetics / Q000378:metabolism; D007314:Insemination; D008297:Male; D008855:Microscopy, Electron, Scanning; D008969:Molecular Sequence Data; D011114:Polynesia; D012336:RNA, Ribosomal, 16S / Q000235:genetics / Q000378:metabolism; D012339:RNA, Ribosomal, 28S / Q000235:genetics / Q000378:metabolism; D060047:Reproductive Isolation; D017422:Sequence Analysis, DNA; D012726:Sexual Behavior, Animal; D061350:Sympatry
chemical_list: D019476:Insect Proteins; D012336:RNA, Ribosomal, 16S; D012339:RNA, Ribosomal, 28S; D003576:Electron Transport Complex IV