Nieser reunió las especies de chinches acuáticas incluidas por Lauck en los grupos Belostoma plebejum y Belostoma pygmeum en un solo grupo, Belostoma plebejum, criterio que se sigue en este trabajo. El grupo incluye siete especies pequeñas que presentan el divertículo ventral de los genitales masculinos recurvado ventrad: Belostoma lariversi De Carlo, 1969; B. micantulum (Stål, 1858); B. plebejum (Stål, 1858); B. pygmeum (Dufour, 1863); B. minusculum (Uhler, 1884), las cuales se redescriben e ilustran y B. parvum registrada de Venezuela, Colombia, Guyana, Suriname y Brazil y B. nicaeum registrada de Manaus, Brasil. Las dos especies nuevas que se describen e ilustran.

Nieser gathered the water bug species included by Lauck in the groups Belostoma pygmeum and Belostoma plebejum in a single group, Belostoma plebejum. We follow this criterion and use the terminology used by Estévez and Polhemus for species descriptions. The Belostoma plebejum group includes seven small species with the ventral diverticulum of male genitalia recurved ventrad: Belostoma lariversi De Carlo, 1969; B. micantulum (Stål, 1858); B. plebejum (Stål, 1858); B. pygmeum (Dufour, 1863); B. minusculum (Uhler, 1884). B. parvum sp. nov. from Venezuela, Colombia, Guyana, Suriname and Brazil, and B. nicaeum sp. nov. from Manaus, Brazil. The two new species are described and illustrated, and new synonymies are proposed. Rev. Biol. Trop. 55 (1): 147-155. Epub 2007 March. 31.

Se describen nuevos caracteres morfológicos diagnósticos que apoyan los argumentos utilizados por Todd, para separar las subfamilias Nerthrinae y Gelastocorinae (Gelastocoridae). Se describen e ilustran las glándulas cefálicas, la placa maxilar y la ubicación de los espiráculos abdominales

Subfamily separation in the hemipteran family Gelastocoridae (Hemiptera). Gelastocoridae (Kirkaldy, 1897) has over 70 species in two subfamilies: Nerthrinae (Kirkaldy, 1898), genus Nerthra (Say, 1832) and Gelastocorinae (Champion, 1901), genus Gelastocoris (Kirkaldy, 1897). The position of the cephalic gland openings, presence and shape of the gular bridge and the number and position of abdominal spiracles, are presented as new morphologic diagnostic characteristics that support the argument used by Todd for the segregation of the subfamilies. The characteristics are described and illustrated on the basis of specimens from Laguna Iberá, Corrientes, Argentina. Rev. Biol. Trop. 54 (4): 1319-1322. Epub 2006 Dec. 15

Se considera que el desarrollo embrionario y la emergencia de las ninfas de las especies de Belostomatinae (Heteroptera, Belostomatidae) se cumplen con éxito si los huevos son incubados sobre el espacio dorsal de machos adultos. No obstante, hemos registrado eclosiones exitosas a partir de dos hembras grávidas portando huevos sobre su dorso; una de ellas de la especie Belostoma elegans (Mayr), la otra de B. micantulum (Stål). Se registra la eclosión de huevos, previamente removidos del área de postura por los propios machos incubantes de B. elegans (N=4) y la presencia de una hembra de B. elongatum Montandon, portando huevos sobre sus hemiélitros, los cuales no eclosionaron después de haber sido removidos por la propia hembra.

Within Belostomatinae water bug species (Heteroptera, Belostomatidae) it has been hitherto believed that the completion of embryonic development is successful only if eggs are incubated on male hemelytra. Nevertheless, we found egg successful hatching from a back- brooding Belostoma elegans (Mayr) and B. micantulum (Stål) females, as well as from fertilized eggs kicked off from four back-brooder B. elegans males. One "encumbered" B. elongatum Montandon female was also recorded, but eggs did not hatch after she removed them. Rev. Biol. Trop. 54(2): 515-517. Epub 2006 Jun 01.

A key to species groups of the genus Belostoma Latreille, 1807, using new taxonomic characters are presented as well as the revision of the four species included in the denticolle group: B. denticolle Montandon, 1903, and three new species: B. orbiculatum from eastern Argentina and southern Brazil, B. retusum from eastern Argentina and B. amazonum from northern Brazil which are described and illustrated.