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RESUMEN El Refugio de Vida Silvestre Los Pantanos de Villa (RVSLPV) es el único humedal costero ubicado dentro del área urbana de Lima que es reconocido como sitio Ramsar. Poco se conoce sobre la diversidad de macroinvertebrados que habitan la zona y qué factores ambientales tienen influencia sobre estos organismos. El objetivo de este estudio fue determinar la composición de la comunidad de coleópteros acuáticos y evaluar sus relaciones con las variables fisicoquímicas del agua. Para ello se establecieron 12 estaciones de muestreo en seis lagunas del RVSLPV y se evaluaron in situ los parámetros: oxígeno disuelto (OD), conductividad eléctrica (CE ), temperatura del agua (T), potencial de hidrógeno (pH) y turbidez (Turb). Se identificaron 1475 coleópteros acuáticos agrupados en tres familias y 13 especies, reportando dos nuevos registros para el Perú: Desmopachria challeti K. B. Miller (Dytiscidae) e Hydraena quechua Perkins (Hydraenidae). Los Análisis de Componentes Principales (ACP) y de Correspondencia Canónica (ACC) mostraron que las variables fisicoquímicas de mayor influencia fueron CE, pH y turbidez; además, encontramos que las especies de Hydrophilidae se asocian a una alta tolerancia a la CE. Por el contrario, relacionados con valores menores al promedio de T, CE, Turb, OD y una alcalinidad ligeramente alta, ocurren las especies de Dytiscidae e Hydraenidae (excepto G. peruvianus); estas requerirían de otras condiciones probablemente relacionadas al tamaño y profundidad de las lagunas, así como con la diversidad florística.

ABSTRACT Pantanos de Villa (RVSLPV) is the only coastal wetland located within the urban area of Lima that is recognized as a Ramsar site. Little is known about the diversity of macroinvertebrates that inhabit the area and what environmental factors influence them. The objective of this study was to determine the composition of the community of aquatic beetles and evaluate their relationships with the physicochemical variables of the water. For this, 12 sampling stations were established in six lagoons of Pantanos de Villa and there were evaluated in situ: dissolved oxygen (DO), electrical conductivity (EC), water temperature (T), hydrogen potential (pH), and turbidity (Turb). 1475 aquatic beetles grouped into three families and 13 species were identified, reporting two new records for Peru: Desmopachria challeti K. B. Miller (Dytiscidae) and Hydraena quechua Perkins (Hydraenidae). Principal Component Analysis (PCA) and Canonical Correspondence (CCA) show that the physicochemical variables with the greatest influence were CE, pH, and turbidity. In this sense, Hydrophilidae species were associated with a high tolerance to CE. On the contrary, related to values lower than the average of T, CE, Turb, OD, and with slightly high alkalinity, we found the species of Dytiscidae and Hydraenidae (except G. peruvianus); they would require other conditions, probably related to the size and depth of the lagoons, as well as the floristic diversity.

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RESUMEN Los escarabajos acuáticos de la familia Elmidae son ampliamente utilizados en monitoreos hidrobiológicos de ecosistemas lóticos. En este estudio se revisaron muestras pertenecientes a 22 municipios y 38 cuerpos de agua del departamento de Antioquia, las cuales fueron recolectadas utilizando red triangular o surber. Se registran por primera vez las especies Cylloepus francescae, C. whitemanae, Macrelmis clypeata, M. elicioi y Disersus longipennis para Colombia. Esta información contribuye a la actualización del número de especies y la distribución geográfica de la familia Elmidae en Colombia.

ABSTRACT The aquatic beetles of the Elmidae family are widely used in the hydrobiological monitoring of lotic ecosystems. In this work, samples belonging to 22 municipalities and 38 bodies of water in the department of Antioquia were reviewed, which were collected using a triangular or surber network. The species Cylloepus francescae, C. whitemanae, Macrelmis clypeata, M. elicioi and Disersus longipennis are recorded for the first time in Colombia. This information contributes to the updating of the number of species and geographical distribution of the family Elmidae in Colombia.

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The Chilean water penny genus Tychepsephus Waterhouse, 1876 is revised, with descriptions and photographic illustrations of life stages including two larval morphotypes, the pupa of one morphotype, and adults of two species. The pupa of Tychepsephus has not been reported previously. Tychepsephuscekalovicisp. nov. is described, and Ectopria (Chilectopria) grandis Pic, 1947, syn. nov. is proposed as a new synonym of Tychepsephusfelix Waterhouse, 1876, which is redescribed. Taxonomic treatment of the adults of both species includes images of the habitus of males and females, morphological variation, and male and female genitalia. Males and females are sexually dimorphic. Information on the habitat of Tychepsephus is provided and illustrated with photographs, and the known geographic distribution of the two species is mapped. The occurrence of Tychepsephus in Argentina is reported; therefore, the genus no longer can be considered endemic to Chile. The taxonomic status and geographic distribution in South America of other species of Psephenidae, particularly members of the subfamily Eubriinae, is reviewed.

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The New World species of the minute aquatic beetle genus Notomicrus Sharp compose a much greater diversity than their Old World congeners, with 14 of the 17 known Notomicrus species occurring in the Neotropics. A recent phylogenetic study recovered four primary New World species groups and found that there are a number of undescribed species across all of these main lineages. Here, we provide a taxonomic key to these New World species groups, including two described species that we currently do not place in any group ("incertae sedis" species), complete with images and illustrations of diagnostic characters and taxonomic notes including a list of known species in each group. This work provides a scaffold for further planned taxonomic revisions within the genus. In addition, we review the first of the four New World groups, the josiahi species group and describe one new taxon, N. interstinctus sp. nov. from northern Brazil. Provided are descriptions, habitus images and illustrations of diagnostic characters.

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The genus Hexacylloepus extends from the Neotropical region to the southwestern United States of America. At present, 25 species are known from 20 countries, with no new species proposed since 1972. In this paper, we describe and illustrate 18 new species (H. barrae; H. calori; H. casariae; H. froehlichi; H. geiseri; H. grandis; H. iassu; H. keitai; H. maierae; H. manauara; H. metapa; H. phalluspilosus; H. shorti; H. taylorae; H. thoracica; H. tibialis; H. ubirajarai; H. zaninii), from eight countries and give the first records of the genus from Suriname and Guyana.

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The water scavenger beetle genus Chasmogenus Sharp, 1882 is reviewed in northeastern South America using an integrative approach that combines adult morphology and molecular data from the gene cytochrome c oxidase I (COI). Eighteen new species are described: Chasmogenus acuminatus sp. nov. (Brazil, French Guiana, Guyana, Suriname), C. amplius sp. nov. (Venezuela), C. berbicensis sp. nov. (Guyana), C. brownsbergensis sp. nov. (Suriname), C. castaneus sp. nov. (Venezuela), C. clavijoi sp. nov. (Venezuela), C. cuspifer sp. nov. (Venezuela), C. flavomarginatus sp. nov. (Venezuela), C. gato sp. nov. (Venezuela), C. guianensis sp. nov. (Suriname, Guyana), C. ignotus sp. nov. (Brazil), C. ligulatus sp. nov. (Suriname), C. lineatus sp. nov. (Venezuela), C. pandus sp. nov. (Brazil, French Guiana, Suriname), C. schmits sp. nov. (Suriname), C. sinnamarensis sp. nov. (French Guiana), C. tafelbergensis sp. nov. (Suriname), and C. undulatus sp. nov. (Guyana). We found genetic support for an additional new species in Guyana which is currently only known from females that we refer to as Chasmogenus sp. C. We examined the holotypes of the four species previously known from the region, and found that C. occidentalis García syn. nov. and C. yukparum García syn. nov. are conspecific with C. bariorum García, 2000 and are synonymized with that species, which is here redescribed. We redescribe C. australis García and expand the range of this species to include northern Brazil, Guyana, and French Guiana. All species are aquatic, with most being associated with forested streams and forest pools. Of the 21 species, more than half (11) are only known from a single locality indicating the genus may have many more micro-endemic species yet to be discovered in the region. Characters of the male genitalia are essential for confirming the identity of some species, consequently it is not always possible to make positive identifications of unassociated female specimens based on morphology alone. Habitus images are provided as well as a revised key to the genus for northeastern South America.

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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.

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Austrolimnius cleidecostae sp. nov. is one of the smallest species of Elmidae from the Neotropical region. The new species is described and illustrated based on male and female specimens. This species represents the first record in Elmidae of mandibles with an articulated, sclerotized process on inner subapical edge. The specimens were collected from streams in the Atlantic rainforest of São Paulo and Santa Catarina, and habitat notes are given. An updated key for the Austrolimnius Carter & Zeck, 1929 of Brazil is provided. Austrolimnis browni Hinton, 1971 and A. musgravei Hinton, 1939 are recorded for the first time from Brazil.(AU)

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Austrolimnius cleidecostae sp. nov. is one of the smallest species of Elmidae from the Neotropical region. The new species is described and illustrated based on male and female specimens. This species represents the first record in Elmidae of mandibles with an articulated, sclerotized process on inner subapical edge. The specimens were collected from streams in the Atlantic rainforest of São Paulo and Santa Catarina, and habitat notes are given. An updated key for the Austrolimnius Carter & Zeck, 1929 of Brazil is provided. Austrolimnis browni Hinton, 1971 and A. musgravei Hinton, 1939 are recorded for the first time from Brazil.

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Abstract Austrolimnius cleidecostae sp. nov. is one of the smallest species of Elmidae from the Neotropical region. The new species is described and illustrated based on male and female specimens. This species represents the first record in Elmidae of mandibles with an articulated, sclerotized process on inner subapical edge. The specimens were collected from streams in the Atlantic rainforest of São Paulo and Santa Catarina, and habitat notes are given. An updated key for the AustrolimniusCarter & Zeck, 1929 of Brazil is provided. Austrolimnis browniHinton, 1971 and A. musgraveiHinton, 1939 are recorded for the first time from Brazil.

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Elmidae is one of the most diverse families of aquatic beetles, with more than 1500 species in 148 genera. Cylloepus is the genus with the most species in Americas, with 52 species and 2 subspecies currently known. The genus is easily recognised by external morphology; body elongate, pronotum with a longitudinal impression on the disc and elytra striate and punctate. In this paper, based on the study of several international reference collections, we propose two new combinations, and describe two new species of Cylloepus (C. bispoi sp. nov. and C. segurae sp. nov.) from Ecuador and Bolivia.

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Neocylloepus Brown, 1970 and Pilielmis Hinton, 1971 are Neotropical genera of riffle beetles, mainly distributed in Central America and the north of South America. These genera are here reported for the first time from Venezuela, and a new species, Pilielmis shepardi sp. nov. is described and illustrated. The type material is housed in Museu de Zoologia da Universidade de São Paulo, São Paulo, Brazil (MZSP), Natural History Museum, London, UK (BMNH), Museo del Instituto de Zoología Agrícola, Maracay, Venezuela (MIZA), Michael A. Ivie Collection, Bozeman, Montana, USA (MAIC), and National Museum of Natural History, Smithsonian Institution, Washington DC, USA (USNM).

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Recent study of the water scavenger beetle subfamily Acidocerinae in the Neotropical region has uncovered numerous undescribed species that are not able to be placed in existing genera. Here, we describe three new genera to accommodate 17 of these new species from South America: Aulonochares gen. nov. for Aulonochareslingulatus sp. nov. (French Guiana, Suriname), Aulonocharesnovoairensis sp. nov. (Brazil), and Aulonocharestubulus sp. nov. (Brazil, Guyana, Suriname, Venezuela); Ephydrolithus gen. nov. for Ephydrolithushamadae sp. nov. (Brazil), Ephydrolithusminor sp. nov. (Brazil), Ephydrolithusogmos sp. nov. (Brazil), Ephydrolithusspiculatus sp. nov. (Brazil), and Ephydrolithusteli sp. nov. (Brazil); and Primocerus gen. nov. for Primoceruscuspidis sp. nov. (Venezuela), Primocerusgigas sp. nov. (Venezuela), Primocerusneutrum sp. nov. (Guyana, Suriname, Venezuela), Primocerusocellatus sp. nov. (Venezuela), Primoceruspetilus sp. nov. (Brazil), Primoceruspijiguaense sp. nov. (Venezuela), Primocerusmaipure sp. nov. (Venezuela), Primocerussemipubescens sp. nov. (Guyana), and Primocerusstriatolatus sp. nov. (Suriname). The genus Ephydrolithus gen. nov. is currently known to be restricted to seepages in the mountainous regions of the Brazilian Shield. Aulonochares gen. nov. and Primocerus gen. nov. are both currently only known from the Guiana Shield, though widespread in that region where they are associated with streams and seeps. We present differential diagnoses, maps, habitat details, and illustrations of all new genera and species here described.

ResumenEl estudio reciente de escarabajos acuáticos de la subfamilia Acidocerinae en la región neotropical, ha revelado numerosas especies no descritas que no pueden ser atribuidas a los géneros existentes. Aquí describimos tres géneros nuevos para acomodar 17 de estas especies nuevas de Suramérica: Aulonochares gen. nov. para Aulonochareslingulatus sp. nov. (Guyana Francesa, Surinam), Aulonocharesnovoairensis sp. nov. (Brasil), y Aulonocharestubulus sp. nov. (Brasil, Guyana, Surinam, Venezuela); Ephydrolithus gen. nov. para Ephydrolithushamadae sp. nov. (Brasil), Ephydrolithusminor sp. nov. (Brasil), Ephydrolithusogmos sp. nov. (Brasil), Ephydrolithusspiculatus sp. nov. (Brasil), y Ephydrolithusteli sp. nov. (Brasil); y Primocerus gen. nov. para Primoceruscuspidis sp. nov. (Venezuela), Primocerusgigas sp. nov. (Venezuela), Primocerusneutrum sp. nov. (Guyana, Surinam, Venezuela), Primocerusocellatus sp. nov. (Venezuela), Primoceruspetilus sp. nov. (Brazil), Primoceruspijiguaense sp. nov. (Venezuela), Primocerusmaipure sp. nov. (Venezuela), Primocerussemipubescens sp. nov. (Guyana), y Primocerusstriatolatus sp. nov. (Surinam). El género Ephydrolithus gen. nov. se restringe hasta ahora a hábitats higropétricos en las regiones montañosas del Escudo Brasileño. Aulonochares gen. nov. y Primocerus gen. nov. son ambos hasta ahora conocidos del Escudo Guyanés, no obstante, ampliamente distribuidos en esa región en la que están asociados con corrientes y hábitats higropétricos. Presentamos diagnosis diferenciales, mapas, detalles sobre los hábitats e ilustraciones para todos los géneros y especies que aquí se describen.

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Yara marmontsedu, a new species in the family Hydroscaphidae (Coleoptera: Myxophaga), is described and illustrated. Specimens of Y. marmontsedu were collected at the Pijibay Creek, tributary of the Mico River in Chontales, Nicaragua. The immature stages are described and illustrated for the first time for a species of Yara. This is a contribution to the knowledge of the water beetle fauna of Nicaragua.

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New World species assigned to the Helochares subgenus Hydrobaticus MacLeay are reviewed based on adult morphology and DNA sequence data. Nine species are recognized, including five here described as new: Helochares (Hydrobaticus) laevis n. sp. (Mexico), H. (Hydrobaticus) nexus n. sp. (Ecuador, Panama, Venezuela), H. (Hydrobaticus) politus n. sp. (Guatemala), H. (Hydrobaticus) trujillo n. sp. (Venezuela), and H. (Hydrobaticus) zamora n. sp. (Ecuador). New records are provided for the three previously described species: Helochares (Hydrobaticus) championi Sharp, 1882 (Costa Rica, Guatemala, Nicaragua), H. (Hydrobaticus) maculicollis Mulsant, 1844 (United States), and H. (Hydrobaticus) normatus (LeConte, 1861) (United States to Costa Rica). A ninth species, known only from five poorly preserved female specimens from Peru, is left undescribed until additional material can be found. Most species are known to exhibit some parental care, with the egg case being attached to the abdomen of and carried by the female. Intraspecific genetic distances within several species are very high, in some cases more than 8% in the mitochondrial gene COI, suggesting there may be additional cryptic species remaining to be identified. All taxa are illustrated and a key to species is provided.

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The genus Ytu Reichardt is the most diverse within Torridincolidae, currently with 19 species. Five new species are described herein, four of them from various localities in the southeast of Brazil (type localities in parentheses): Ytu hermes sp. nov. (Brazil, Espírito Santo, Dores do Rio Preto, Pedra Menina, Parque Nacional do Caparaó, Cachoeira Sete Pilões); Ytu hypnos sp. nov. (Brazil, Rio de Janeiro, São Fidelis, Serra Bela Joana); Ytu nyx sp. nov. (Brazil, Espírito Santo, Dores do Rio Preto, Pedra Menina, Parque Nacional do Caparaó, Rio São Domingos, Cachoeira do Aurélio); Ytu thanatos sp. nov. (Brazil, Espírito Santo, Castelo, Parque Estadual do Forno Grande). The other new species, Ytu coeus sp. nov. (Brazil, Espírito Santo, Dores do Rio Preto, Pedra Menina, Parque Nacional do Caparaó, nascente do Rio São Domingos) is described from Brazilian States of Espírito Santo and Ceará, the latter being the first record of this genus in northeastern Brazil. Illustrations of habitus and important diagnostic characters are provided. The new species are compared to other similar species of the genus. New records of some other species of Ytu are presented.

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Notomicrus petrareptans sp. n. is described from an inselberg seepage in southwestern Suriname. This species is diagnosable by a combination of its weakly punctate elytra, respective shapes of the pro- and mesotarsal claws (males), and long and slender median lobe of the aedeagus. This is the first member of the subfamily Notomicrinae to be described from hygropetric seep habitats and only the second known seep-dwelling species of the family Noteridae. Diagnostic characters are illustrated and habitat images are provided.

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El objetivo de este estudio fue conocer la composición y estructura de la comunidad de coleópteros acuáticos en diferentes quebradas a lo largo de un amplio gradiente altitudinal (476-4411 m de altitud) en Cusco, Perú. Para ello, se establecieron 12 estaciones de muestreo y se realizaron dos colectas durante los meses de mayo y julio-agosto del 2013 (época seca), en la zona de rápidos y sustrato pedregoso. Fueron colectados 3069 individuos entre larvas y adultos de coleópteros acuáticos, pertenecientes a 23 géneros, agrupados en 10 familias. Elmidae presentó la mayor riqueza (13 géneros) y abundancia (90.4 %), distribuyéndose a lo largo de todo el gradiente. Los géneros más representativos por abundancia fueron: Austrelmis, Neoelmis, Heterelmis y Anchytarsus. Las pruebas estadísticas no paramétricas Wilcoxon-Mann-Whitney y Kruskall-Wallis para la riqueza, abundancia y estructura comunitaria, así como, el análisis de agrupamiento (CLUSTER) y el análisis de similitud (ANOSIM) mostraron diferencias significativas en la composición de la comunidad de coleópteros acuáticos a lo largo del gradiente estudiado. El análisis de similitud porcentual (SIMPER) permitió identificar los géneros que más influyeron en la estructura comunitaria, destacando Neoelmis y Heterelmis en estaciones ubicadas a baja y media altitud, y Austrelmis en estaciones de mayor altitud. Se evidenció una correlación positiva de la temperatura con la riqueza, diversidad y equidad, y una correlación negativa de la altitud con estas mismas variables.

The aim of this paper was to know the composition and structure of water beetles community in different streams along a wide altitudinal gradient (476-4411 m altitude) in Cusco, Peru. For that, 12 sampling stations were established and two collects were carried out during May and July-August 2013 (dry season), in the running water and stony substrate. A total of 3069 individuals were collected between larvae and adults of aquatic beetles, belonging to 23 genera, grouped into 10 families. Elmidae presented the highest richness (13 genera) and abundance (90.4%), being distributed along the whole gradient. The most representative genera by abundance were: Austrelmis, Neoelmis, Heterelmis and Anchytarsus. The Wilcoxon-Mann-Whitney and Kruskall-Wallis non-parametric statistical tests for richness, abundance and community structure, clustering analysis (CLUSTER) and similarity analysis (ANOSIM) showed significant differences in the composition of the beetles community along the gradient studied. The percentage similarity analysis (SIMPER) allowed to identify the genera that most influenced the community structure, stand out Neoelmis and Heterelmis in stations located at low and medium altitude, and Austrelmis in stations of higher altitude. A positive correlation of temperature with the richness, diversity and equity, and a negative correlation with these variables altitude was evident.

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Heterelmis Sharp, 1882, comprises 22 species and subspecies with 3 species assigned to Brazil so far. Here the forth species, Heterelmis debilis sp. nov. from Brazil, is described and illustrated. The type material is deposited in the Museum of Zoology of the University of São Paulo, São Paulo, Brazil (MZSP) and Natural History Museum, London, UK (NHMUK). Additionally, an identification key with distributional data for Brazilian species is proposed.(AU)

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Heterelmis Sharp, 1882, comprises 22 species and subspecies with 3 species assigned to Brazil so far. Here the forth species, Heterelmis debilis sp. nov. from Brazil, is described and illustrated. The type material is deposited in the Museum of Zoology of the University of São Paulo, São Paulo, Brazil (MZSP) and Natural History Museum, London, UK (NHMUK). Additionally, an identification key with distributional data for Brazilian species is proposed.

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