Abstract Urutaú Natural Reserve is a protected area in the southwest of Misiones province, Argentina. Regarding the mosquito fauna, 194 species have been recorded for Misiones province so far. It is known that many of them are vectors of pathogens and parasites that cause human and animal diseases. The objective of this work is to understand the mosquito community in order to consider their importance in pathogens and parasites transmission and compare different capturing techniques for mosquito diversity. Larvae, pupae and adults were collected. Comparing the number of species and individuals captured as adult with different methodologies, Net /insect hand aspirator was the most effective methodology capturing diversity of species while CDC light trap captured significantly higher number of individuals. We confirmed the presence of 30 mosquito species belonging to nine genera, of which 12 are suspected of being involved in pathogen transmission. Among them, Sabethes (Sabethes) albiprivus Theobald, the only mosquito from which the Yellow fever virus has been isolated in Argentina. Additionally, we recorded Culex (Culex) lahillei Bachmann & Casal for the first time in Misiones province, and Aedes (Protomacleaya) terrens (Walker) and Culex (Melanoconion) ribeirensis Forattini & Sallum are new citations for Capital Department, Misiones.

Resumen La Reserva Natural Urutaú está ubicada en el suroeste de la provincia de Misiones, Argentina, entre los departamentos de Candelaria y Capital. Dicha provincia tiene un registro general de 194 especies de mosquitos incluyendo vectores de patógenos y parásitos que causan enfermedades al humano y animales. El objetivo de este trabajo es conocer la comunidad de mosquitos particularmente en el área de la reserva, comparar el desempeño de las técnicas de muestreo de adultos utilizada y considerar la importancia sanitaria de dicha comunidad. Se colectaron larvas, pupas y adultos. Comparando el número de especies e individuos adultos capturados con diferentes metodologías, red/aspirador fue la más eficaz para capturar diversidad de especies, mientras que la trampa de luz CDC lo fue para la variable número de individuos. Confirmamos 30 especies de mosquitos pertenecientes a nueve géneros, estando 12 de ellas implicadas en la transmisión de patógenos o parásitos. Entre ellas, Sabethes (Sabethes) albiprivus Theobald, la única especie de mosquito de la cual se ha aislado el Virus de la fiebre amarilla en Argentina. Adicionalmente, registramos Culex (Culex) lahillei Bachmann & Casal por primera vez en la provincia de Misiones, y tanto Aedes (Protomacleaya) terrens (Walker) como Culex (Melanoconion) ribeirensisForattini & Sallum son nuevas citas para el Departamento Capital, Misiones.

Uma espécie nova do gênero Cephalobium (Nematoda, Cephalobiidae), parasita de Anurogryllus muticus (De Geer) (Ortoptera, Gryllidae) de Gorina, La Plata, Argentina, é descrita e ilustrada. Este nematoda pode ser caracterizado por apresentar estoma mais longo que largo, o aparelho glottoideo anisoglottideo e anisomórfico, dividido em duas porções, uma com paredes quitinizadas e a outra com três dentes dorsais simples. O macho possui espículas longas e separadas e o gubernáculo curto sem qualquer projeção. As papilas genitais estão organizadas em cinco pares pós-anais.

A new species of Cephalobium from Gorina, La Plata, Argentina, parasiting nymphs of Anurogryllus muticus (De Geer) (Orthoptera, Gryllidae) is described and illustrated. This nematode can be characterized by having the stoma longer than broad, the glottoid apparatus anisoglottid and anisomorphic, divided into two portions, one with cuticularized walls and the other with three simple dorsal teeth. The male is further characterized by the presence of two long and separated spicules and short gubernaculum without any projection. Genital papillae are arranged in five postanal pairs.