RESUMO
The primary and secondary chaetotaxy of the head capsule and head appendages of the three larval instars of the water scavenger beetle genus Derallus Sharp are described for the first time based on two species: D. angustus Sharp and D. paranensis Oliva. Morphometric characters derived from the head capsule and mouthparts are included, together with detailed illustrations of all characters. Chaetotaxy of these larvae is compared with that of Regimbartia attenuata (Fabricius), another species belonging to the Derallus-clade of Berosini.
Assuntos
Besouros , Animais , Extremidades , Cabeça , LarvaRESUMO
Two new species of Hemiosus (Coleoptera: Hydrophilidae) from the central cordillera of the Colombian Andes are described. Hemiosus molanoi González-Rodríguez García-Hernández sp. nov. and H. quindiensis González-Rodríguez Clarkson sp. nov. are described based in 56 adult specimens collected in river-associated sandy puddles (26 specimens of H. molanoi sp. nov.) and temporary puddles near crops (26 specimens of H. quindiensis sp. nov.). Both species are identified mainly by characteristics of the aedeagus: Hemiosus molanoi sp. nov. has subtriangular parameres, median lobe shorter than parameres and longer than appendices which are acuminate and phallobase shorter than parameres, strongly asymmetrical in basal two-fifths; H. quindiensis sp. nov. has parameres gradually tapering towards rounded apices, median lobe shorter than parameres and longer than appendices which are acuminate and phallobase shorter than parameres, strongly asymmetrical in basal half. Dorsal coloration pattern, overall shape of the meso- and metaventral process and abdominal ventrites are also informative to distinguish the new species from remaining described Hemiosus. Diagnoses, illustrations and habitat characteristics are provided.
Assuntos
Besouros , Animais , Colômbia , Produtos Agrícolas , Ecossistema , ÁguaRESUMO
As a contribution to knowledge of the aquatic beetles of the Neotropical Region, the genus Berosus Leach is recorded for the first time from Roraima State in northern Brazil. Three new species are described and illustrated: Berosus illuviosus sp. n., B. parvus sp. n., and B. andreazzei sp. n. In addition, we present a checklist of the Berosus species collected in 26 ponds in the savanna area of the State of Roraima, with 12 new species records for the state, five of which are also new country records for Brazil.
Assuntos
Besouros , Animais , Brasil , LagoasRESUMO
The Cuban fauna of the genus Berosus Leach, 1817 is reviewed based on newly collected material as well as historical and type specimens. Nine species are recognized, including three recorded from Cuba for the first time: Berosus infuscatus LeConte, 1855, Berosus interstitialis Knisch, 1924 (= Berosus stribalus Orchymont, 1946 syn. n.) and Berosus metalliceps Sharp, 1882. Only one of the nine Cuban species, Berosus chevrolati, remains endemic to Cuba, as two other species previously considered as endemic to Cuba are recorded from elsewhere: Berosus quadridens from Mexico and Central America and Berosus trilobus from the Dominican Republic. Notes on biology and Cuban distribution are provided for all nine species. Berosus quadridens Chevrolat, 1863, stat. restit. is removed from synonym with Berosus truncatipennis and considered a valid species.
ResumenLa fauna cubana de Berosus Leach, 1817 es revisada a partir de nuevo material colectado así, como de material tipo e histórico. Se reconocen un total de nueve especies, incluyendo tres nuevos registros: Berosus infuscatus LeConte, 1855, Berosus interstitialis Knisch, 1924 (= Berosus stribalus Orchymont, 1946, syn. n.) y B metalliceps Sharp, 1882. Solo una de las nueve especies cubanas, Berosus chevrolati, permanece como endémica, las otras dos especies originalmente consideradas como endémicas han sido registradas fuera de Cuba: Berosus quadridens presente en México y América Central y Berosus trilobus en República Dominicana. Se ofrecen datos sobre la biología y la distribución de todas las especies cubanas. Berosus quadridens Chevrolat, 1863, stat. restit. es destituida como sinónimo de Berosus truncatipennis y considerada como una especie válida.