RESUMEN
Interommatidial sensilla have been explored for their taxonomic value and other aspects in Diptera and Lepidoptera. In Heteroptera, Eurystethus is the only genus where these structures were examined in delimiting subgenera and species. This study investigates the presence, distribution, and morphology of interommatidial sensilla in Discocephalinae species and discusses the sensilla's value for cladistic and taxonomic appraisals. Twenty species of 18 genera were analyzed: 16 Discocephalini genera, one genus in Ochlerini, and one genus in Edessinae. Species' heads were observed from photographs taken with light microscopy (LM) and scanning electron microscopy (SEM). From these images, we identified eleven types of sensilla, classified into chaetica, trichoidea and coeloconica. In LM, only sensilla chaetica with a length of 40-100 µm were visible, present in six species. Under the SEM at least one type of sensillum was visible in 19 of the 20 species analyzed. No difference between the various kinds of sensilla were apparent between males and females or adults and nymphs of a given species. Both subgenera of Eurysthetus have the same type of sensillum (chaeticum type I), which suggests this is not a delimiting feature. We conclude that sensilla chaetica can be a valuable character to delimit groups of genera within Discocephalini.
Asunto(s)
Heterópteros , Animales , Femenino , Masculino , Antenas de Artrópodos/anatomía & histología , Heterópteros/anatomía & histología , Microscopía Electrónica de Rastreo , Ninfa , Sensilos/anatomía & histologíaRESUMEN
The Heteroptera (true bugs) and its fourth-largest family Pentatomidae (stink bugs) are worldwide distributed groups with higher diversity in the tropics. The pentatomid subfamily Discocephalinae is almost restricted to the Neotropical Region, and it is divided into the tribes Discocephalini and Ochlerini. Eurystethus Mayr, 1864 is placed within Discocephalini and comprises 18 species, 16 out of them classified into two subgenera. Here we describe Eurystethus jo sp. nov., Eurystethus multipunctatus sp. nov., and Eurystethus rufodorsatus sp. nov., all occurring in Brazil, compare them to other species and provide a distribution map.
Asunto(s)
Heterópteros , Animales , Brasil , Hemípteros , Heterópteros/clasificaciónRESUMEN
The new genus Grammedessa is here proposed for 12 species: Edessa pallicornis, E. bugabensis, E. rorativentris and E. stillativentris, and eight new species: Grammedessa brunneotarsata, G. polytreta, G. flavolimbata, G. paraensis, G. braziliana, G. hypsolineata, G. multicavata and G. matogrossensis. Species belonging to this genus share four black punctured longitudinal stripes on the dorsal surface of the head; humeral angles laterally projected and slightly flattened dorso-ventrally; metasternal process with branches of anterior bifurcation narrow, long, and with acute apices; abdominal trichobothria placed laterally, not aligned with spiracles; females with gonocoxites 8 and laterotergites 8 always punctured, gonocoxites 8 large, subequal in length to laterotergites 9; males with ventral rim of pygophore deeply excavated, superior process of genital cup partially fused to the wall. Edessa strigiceps is considered a junior synonym of Grammedessa pallicornis n. comb.. Males of Grammedessa bugabensis n. comb. and Grammedessa rorativentris n. comb. are described for the first time. New distribution records of Grammedessa bugabensis, Grammedessa rorativentris, and Grammedessa stillativentris n. comb. is extended. The lectotype of Edessa bugabensis is herein designated.
Asunto(s)
Heterópteros/anatomía & histología , Heterópteros/clasificación , Animales , Femenino , MasculinoRESUMEN
The edessines from Costa Rica are little known; only 18 species have been registered or described from this country so far. Mainly based in a large sample from Instituto Nacional de Biodiverdidad (INBio), Costa Rica, we decided to update the information concerning Edessinae from Costa Rica. We present a list of species from Costa Rica raising the number of known species from Costa Rica to 65. We are also describing nine new species: Edessa bella Fernandes & Silva, E. bruneolineata Fernandes & Correia, E. curvata Fernandes & Nunes, E. lewisi Fernandes & Silva, E. nigroangulata Fernandes & Silva, E. osae Fernandes & Nunes, E. oxcarti Fernandes & Correia, E. pallidoangulata Fernandes & Nunes and E. puravida Fernandes & Correia. Species were described, illustrated and photographed. Distribution maps for the species are also provided.