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The genus Languidipes is currently represented by three species distributed in southeastern Asia, India, and Sri Lanka. Languidipes corporaali is the most widely distributed species, and both, male and female imagos, as well as nymphs, are known. In contrast, the other species, L. taprobanes and L. lithophagus, are only known from nymphs. Here, we describe a new species, Languidipes janae sp nov, based on male imagos collected from Borneo, Indonesia. This new species is characterized by the presence of ommation on mesonotum, and penis almost completely divided, with sub-quadrate base and a small outer projection basal to the long and slender distal arms. This constitutes the first record of the genus for Borneo. A cladistic analysis of the subfamily Asthenopodinae supports its taxonomic status.

Las Colecciones Biológicas son sumamente importantes para comprender los cambios que ocurren en los sistemas naturales. El Instituto de Biodiversidad Neotropical (IBN) posee una colección de insectos asociados a los ríos de Montaña de Yungas de más de 30 años, sustentada científicamente en estudios sobre sistemática y taxonomía de varios órdenes de insectos. Específicamente los tricópteros son considerados buenos indicadores de calidad de agua. El objetivo de este trabajo es darle visibilidad a la colección del IBN y accesibilidad al conjunto de datos completos de tricópteros a través de portales de libre acceso. Como resultado, la colección está representada por arriba del 50% de las especies descritas para el área de estudio. La gran proporción de los registros (38%) se colectaron entre los 500 y 1.000 msnm y provienen de los años 1999 a 2006. Los registros cubren 14 de 30 áreas protegidas, siendo el Parque Nacional Calilegua el área con mayor número de especies (19 spp.). Tres grandes áreas con escasos registros son identificadas para concentrar futuros esfuerzos de muestreos.

Abstract Secondary production is the formation of heterotrophic biomass across time, which integrates several important ecological processes that affect the life of organisms, populations, communities and ecosystems, but its study has poor developed in South America. The objectives of this work were to describe the diversity of benthic macroinvertebrate assemblages in terms of abundance and biomass, and to quantify their secondary production for the first time in Andean rivers. A quantitative sampling scheme was implemented, using a Surber sampler, in three forested streams. Physical-chemical variables, nutrients, organic matter and chlorophyll were measured also. The macroinvertebrates were separated and identified mostly at the species level. Each taxon was assigned to a functional feeding group. Secondary production was estimated for 38 taxa, mostly Diptera, Trichoptera, Coleoptera, and Ephemeroptera. The annual production varied from 3769 to 13916 mg dry mass m-2 y-1. Most abundant taxa were also those with higher production, dominated by Ephemeroptera (Baetidae), Trichoptera (Hydropsychidae) and Diptera (Chironomidae and Simuliidae). Density, biomass, and production of collectors and predators were much higher than the other feeding groups. We expect that our results will be useful to evaluate the effects on stream functioning produced by global warming and other anthropogenic disturbances in our region.

The Salar de Olaroz, located in the Argentine Puna, is one of the largest lithium deposits of the world. Lithium extraction requires large amounts of fresh and brackish water, creating pressure on wetlands of these desert environments. The knowledge of the aquatic fauna of the area is of interest to monitor impacts of these extractive activities. In this work, a study of the Chironomidae (Diptera) prior to mining is carried out in order to understand the structure of the Chironomidae assemblage at morphospecies level, with the aim of evaluating its spatial and seasonal variation, relating changes in the assemblage to some environmental variables. Quantitative biological samples and environmental variables of interest were taken and registered in three streams during four season in three consecutive years (2013-2015). Our results show that the Chironomidae assemblage could respond to variables related with discharge by decreasing its richness. Some morphotypes (e.g., Podonomus, Parametriocnemus, Limnophyes and Polypedilum) associated with changes in pH, decreases in dissolved oxygen and water velocity, and increases of finer sediments could disappear from the area.

Abstract The family Polymitarcyidae, with a worldwide distribution, includes mayflies with large burrowing nymphs. South America harbors the highest diversity of this family, including the subfamilies Asthenopodinae and Campsurinae. In this work, three new species belonging to the genera Tortopsis and Tortopus (Campsurinae) are described based on adults and nymphs from Colombia: Tortopsis toro sp. nov., Tortopsis andaki sp. nov. and Tortopus coreguaje sp. nov. Additionally, Tortopsis limoncocha is firstly recorded from Colombia. A cladistic analysis of all the species in these genera is presented, using external morphological characters of adults and eggs. Keys to male and female adults of all the species of both genera are presented.

The aim of this work is to evaluate the ecological quality of waters along an environmentally heterogeneous basin, using macroinvertebrate biotic indices (BI). Twelve sampling sites were selected in the Río Grande basin, following an altitudinal gradient across the Puna, Monte and Yungas ecoregions. Sampling was conducted in the dry and rainy seasons, during three consecutive years (2012 to 2014). At each site, physico-chemical parameters were measured and benthic macroinvertebrates were collected. Principal component analysis (PCA) was applied to explore environmental variability in terms of physico-chemical parameters. The water quality of the basin was assessed by means of different biotic indices. Correlation analyses were performed between the biotic indices and the physicochemical parameters. Altitude, NaCl, total dissolved solids (TDS) and electrical conductivity were higher at the Puna and Monte sites, while river discharge, width and depth were higher at the Yungas sites. Biotic indices suggested good water quality. The BMWP (Biomonitoring Working Party) and family richness were the most suitable indices to simultaneously compare the rivers of the different ecoregions. The change in the composition of macroinvertebrate assemblages was observed at an altitude of 1500 m a. s. l., separating arid and humid zones and coinciding with inflection points of conductivity, NaCl and TDS.

Nineteen geographical records for species of Odonata in 2 provinces of Argentina are documented. We provided records for 9 newly recorded species for Córdoba: Lestes spatula Fraser, 1946, Andinagrion peterseni (Ris, 1908), Argentagrion ambiguum (Ris, 1904), Erythemis attala (Selys in Sagra, 1857), Erythemis plebeja (Burmeister, 1839), Erythrodiplax media Borror, 1942, Micrathyria longifasciata Calvert, 1909, Micrathyria hypodidyma Calvert, 1906, and Tramea cophysa Hagen, 1867. In San Luis, we provided records for 10 newly recorded species: Hetaerina rosea Selys, 1853, Acanthagrion lancea Selys, 1876, Ischnura fluviatilis Selys, 1876, Oxyagrion rubidium (Rambur, 1842), Castoraeschna decurvata Dunkle & Cook, 1984, Rhionaeschna pallipes (Fraser, 1947), Phyllocycla argentina (Hagen in Selys, 1878), Erythrodiplax corallina (Brauer, 1865), Perithemis mooma Kirby, 1889, and Planiplax erythropyga (Karsch, 1891). Among these records, we extend the geographic distribution of A. peterseni and R. pallipes, which are endemic to Argentina and recorded P. erythropyga for the first time in Chaco phytogeographic province.

Abstract: The distribution of aquatic insects has been poorly explored in quantitative analyses aiming at the historical reconstruction of area relationships in the Neotropics. Ephemeroptera is an ancient group, characterized by its low vagility, and of high richness and endemicity in this region. Systematic knowledge of the group has enormously increased in the last decades, achieving a sufficient background to explore biogeographical historical patterns. Our aim is to reconstruct area history in the Neotropics using the rationale of Barrier biogeography (Hovenkamp protocol). We present eleven mayfly phylogenies, representing groups that evolved independently at least from the Jurassic (i.e., not a one-taxon history). With these groups, we conducted independent biogeographical analyses (using Vicariance Inference Program), and extracted the events that repeated in two or more clades. We found fifty-eight TVEs (Traceable Vicariant Events), from which four were found at least twice, thus constituting SVEs (Supported Vicariant Events).

Abstract: The beautifully colored damselflies included in Neoneura Selys are divided in 28 species known from North, Central and South America. Larval stage is little known, only seven species were described at this stage. We describe and illustrate the final instar larva of Neoneura confundens for the first time. Adults associated to this larva correspond to the blue form of the species and are also discussed and illustrated. The larva of N. confundens is similar to other Neoneura larvae, showing 1 premental seta and a well-marked nodus in caudal lamellae, but it can be differentiated by having fringed posterior margin in all tibiae and in middle and hind tarsi, among other characters. A key to known larvae of Neoneura and new records extending the species range in the southern cone are provided.

Una gran parte del noroeste argentino (NOA) está ocupada por zonas áridas vulnerables al avance de las actividades humanas. En este trabajo se caracterizaron los ensambles de macroinvertebrados de los ríos de esas zonas, para lo cual se emplearon distintos índices bióticos a fin de evaluar su respuesta y posible aplicación en la región. En las provincias de Catamarca y La Rioja fueron muestreados 15 ríos y arroyos, en diferentes períodos (23 sitios en total). Se tomaron muestras Surber (dos o tres por sitio) y se registraron datos ambientales. Se realizaron análisis de correspondencia canónica (CCA) para estudiar las relaciones entre los datos ambientales y los ensambles de macroinvertebrados, y se aplicaron diferentes índices bióticos. En total fueron identificados 59 taxa, de los cuales Diptera fue el más rico (12 familias). La máxima diversidad alfa encontrada correspondió a 29 taxa, mientras que la mínima fue 1. Los taxa más abundantes fueron Andesiops peruvianus, Meridialaris tintinnabula, Austrelmis (larva), Orthocladiinae, Smicridea, Helicopsyche y Heleobia. El CCA reveló que la conductividad eléctrica y el ancho húmedo son factores clave que influyen en la estructura de los ensambles de macroinvertebrados. Entre los índices bióticos utilizados, el de las Sierras de San Luis (IBSSL) mostró la mayor concordancia con el estado ecológico de los ambientes estudiados. Algunos de los sitios investigados poseen una diversidad similar a sitios de zonas áridas de la Argentina, como Cuyo (provincias de San Luis y Mendoza) y la provincia de Catamarca, pero de menor riqueza que los de Patagonia. Los resultados muestran que el IBSSL se puede usar en la región, pero aún deben realizarse ajustes en los valores de corte, tanto para este índice como para otros empleados. Por esta razón, y para mejorar su valor explicativo, se requiere de estudios más detallados que incluyan sitios impactados en diferente grado. https://doi.org/10.25260/EA.18.28.2.0.645 Foto: kataix.umag.cl/sib-aysen/

The Neotropical species of Asthenopodinae are revised in a formal phylogenetic context. The five known species of Asthenopus Eaton, 1871, together with other five new species were included in a cladistic analysis using morphological characters (continuous and discretes). Representatives of the Afro-Oriental group of the subfamily (Povilla Navás, 1912 and Languidipes Hubbard, 1984) were also included to test the monophyletic hypothesis traditionally accepted for the group. Additional taxa representing the other subfamilies of Polymitarcyidae were incorparated: Ephoron Williamson, 1802 (Polymitarcyinae) and Campsurus Eaton, 1868, Tortopus Needham & Murphy, 1924 and Tortopsis Molineri, 2010 (Campsurinae). A matrix of 17 taxa and 72 characters was analyzed under parsimony resulting in a single tree supporting the monophyly of the subfamily Asthenopodinae. Other results include the monophyly of the Afro-Oriental taxa (Povilla and Languidipes), the paraphyletic nature of Neotropical Asthenopodinae, and the recognition of four South American genera: Asthenopus (including A. curtus (Hagen), 1861, A. angelae de Souza & Molineri, 2012, A. magnus sp. n., A. hubbardi sp. n., A. guarani sp. n.), Asthenopodes Ulmer, 1924, stat. n. (including A. picteti Hubbard, 1975, stat. n., A. traverae sp. n., A. chumuco sp. n.), Priasthenopus gen. n. (including P. gilliesi (Domínguez), 1988, comb. n.), and Hubbardipes gen. n. (including H. crenulatus (Molineri et al.), 2011, comb. n.). Descriptions, diagnoses, illustrations and keys are presented for all Neotropical taxa of Asthenopodinae (adults of both sexes, eggs and nymphs). Additionally a key to the subfamilies and genera of Polymitarcyidae is included. A quantitative biogeographic analysis of vicariance is presented and discussed through the study of the “taxon history” of the group.

Este trabajo constituye la primera aproximación al conocimiento de las especies que caracterizan la entomofauna acuática del PNN Gorgona, con énfasis en Ephemeroptera y Plecoptera, su distribución, ecología y relación con la parte continental. Entre Octubre de 2010 y Junio de 2011 se realizaron recolectas de estados inmaduros y adultos en cinco quebradas del sector oriental de la isla, con ayuda de redes entomológicas, trampas Malaise y de luz blanca y negra. Se registran nueve órdenes, 28 familias, 39 géneros y 16 especies. Por primera vez se reportan la familia Dytiscidae (Coleoptera) y los géneros: Zelusia, Farrodes y Terpides (Ephemeroptera), Leucotrichia y Wormaldia (Trichoptera), Laccodytes, Neoelmis y Pheneps (Coleoptera), Maruina y Limonia (Diptera). Se encontraron cuatro especies nuevas de Ephemeroptera y cuatro de Plecoptera, en proceso de descripción. Además, Leptohyphes jodiannae, L. maculatus y Hagenulopsis esmeralda son primeras citas para Colombia. Farrodes caribbianus, F. roundsi, Hagenulopsis zunigae, Zelusia principalis y Anacroneuria choco, reportadas para el país, amplían su rango de distribución para el PNN Gorgona. La riqueza de familias, géneros y especies es alta y se considera una extensión de la fauna de corrientes hídricas de bajo y mediano orden del trópico continental, particularmente en la provincia del Chocó biogeográfico.

Se presentan nuevos registros de 14 especies de Odonata y dos especies de Ephemeroptera, incluyendo dos registros nuevos de Argentina: Nephepeltia leonardina Rácenis (Anisoptera: Libellulidae) y Alloretochus peruanicus (Soldán) (Ephemeroptera: Caenidae). Las distribuciones de Aphylla theodorina (Navás) (Anisoptera: Gomphidae) y Caenis tenella (Navás) (Ephemeroptera: Caenidae) se extienden hasta las Yungas (ambas previamente conocidas para el NE de Argentina). También se presentan nuevos registros geográficos de: Neoneura confundens Wasscher & Van’t Bosch (Coenagrionidae); Anax amazili (Burmeister) (Aeshnidae); Brachymesia furcata (Hagen), Erythemis plebeja (Burmeister), Erythrodiplax melanorubra Borror, E. nigricans (Rambur), Macrothemis imitans imitans Karsch, M. musiva Calvert, Miathyria marcella (Selys) y Micrathyria hesperis Ris (Libellulidae); Progomphus complicatus Selys y Progomphus joergenseni Ris (Gomphidae).

Se presenta una lista de insectos acuáticos colectados en el Parque Provincial Urugua-í, en la provincia de Misiones. Se colectaron 136 especies de insectos acuáticos, distribuidas en 75 géneros de 26 familias, correspondientes a siete órdenes. Se mencionan nuevas citas de la provincia y de Argentina, así como la presencia de especies nuevas para la ciencia.

Tricorythodes faeculopsis Belmont, Salles & Hamada, es redescripto e ilustrado a partir de todos los estados. Se registra por primera vez esta especie de Venezuela. Los imagos macho y hembra y los huevos son descriptos por primera vez, y se brinda nueva información para las ninfas. Esta especie se caracteriza por presentar, en los adultos: longitud del ala anterior 2.9–3.6 mm; vena CuP ausente o reducida; forceps con segmentos I y II subiguales en longitud; penes piramidales, con márgenes amarillentos; ninfas: palpo maxilar pequeño, 1-segmentado; razón longitud / ancho máximo de los fémures ca. 0.3; uñas tarsales con 4–10 dentículos marginales y 1–2 submarginales; huevos con costillas longitudinales.

Tortopus Needham & Murphy, 1924 and Tortopsis Molineri, 2010 with six and 10 species, respectively, are sister genera distributed in the Neartic and Neotropical regions. In spite that most species are known from the tropics of South America, only one species of each of these groups have been recorded from Brazil. Here we present distributional data expanding greatly the range of these groups including three new country records for Brazil: Tortopus igaranus Needham & Murphy, 1924, Tortopsis limoncocha Molineri, 2010 and Tortopsis spatula Molineri, 2010. We describe a distinct new species, Tortopus ipixuna sp. nov., from male imagos, that present a unique subrectangular pedestal. Additionally we redescribe the male imago of Tortopus harrisi Traver, 1950 (previously known only from the holotype), and we give the first records for Tortopsis canum Gonçalves, Da-Silva & Nessimian, 2011 from Espírito Santo and for Tortopsis spatula from Ecuador. Some variations in morphological structures of these species are also described, illustrated and discussed.Tortopus Needham & Murphy, 1924 e Tortopsis Molineri, 2010 com seis e 10 espécies, respectivamente, são gêneros irmãos distribuídos nas regiões Neártica e Neotropical. A despeito da maioria das espécies ser conhecida de áreas tropicais da América do Sul, apenas uma espécie de cada um dos gêneros foi registrada para o Brasil. No presente estudo apresentamos dados que expandem significativamente a distribuição desses grupos, incluindo três registros inéditos para o Brasil: Tortopus igaranus Needham & Murphy, 1924, Tortopsis limoncocha Molineri, 2010 e Tortopsis spatula Molineri, 2010. Descrevemos uma nova espécie, Tortopus ipixuna sp. nov., a partir de imagos que apresentam um distinto pedestal subretangular. Adicionalmente redescrevemos a imago macho de Tortopus harrisi Traver 1950 (previamente conhecida apenas pelo holótipo), e registramos Tortopsis canum Gonçalves, Da-Silva & Nessimian, 2011 pela primeira vez para o Espírito Santo, e Tortopsis spatula para o Equador. Algumas variações em estruturas dessas espécies também são descritas, ilustradas e discutidas.

Se estudiaron las especies de Leptohyphidae presentes en la selva de neblina de las yungas. Se conocen, de esta región, dieciocho especies en cinco géneros, incluyendo los siguientes nuevos registros: Leptohyphes liniti Wang, Sites & McCafferty, L. maculatus Allen, L. nigripennis Molineri & Zúñiga, L. setosus Allen y Tricorythodes hiemalis Molineri para Bolivia; Leptohyphes hirsutus Allen & Roback y L. petersi Allen para Bolivia y Argentina y Tricorythodes quizeri Molineri para Argentina. Se presentan diagnosis, ilustraciones y claves para distinguir todas las especies tratadas. El estudio de la distribución de las especies presentes en las yungas reveló tres grupos: 1) un grupo formado por cinco especies restringidas a las yungas, 2) un grupo de ocho especies que extienden sus rangos a través de selvas montanas hacia el norte y 3) un grupo de tres especies también presentes en otras áreas hacia el sur (centro de Argentina y norte de la Patagonia).The species of Leptohyphidae occurring in the Yungas cloud forest are studied. Eighteen species from five genera are known from the region, including the following new country records: Leptohyphes liniti Wang, Sites & McCafferty, L. maculatus Allen, L. nigripennis Molineri & Zúñiga, L. setosus Allen, and Tricorythodes hiemalis Molineri from Bolivia; Leptohyphes hirsutus Allen & Roback and L. petersi Allen from Bolivia and Argentina; and Tricorythodes quizeri Molineri from Argentina. Diagnoses, illustrations, and keys to distinguish the treated species are presented. The study of the distribution of these species revealed three different patterns: 1) a group of five species restricted to the Yungas; 2) a group of eight species that extend their ranges toward the montane forest in the north; and 3) a group of three species also present in southern areas (central Argentina and northern Patagonia).

Se proporciona una lista de las 70 especies citadas para Uruguay. Catorce de ellas constituyen nuevos registros para el país: Mnesarete pruinosa (Hagen en Selys) [Calopterygidae), Acanthagrion lancea Selys, A. peruvianum Leonard, Argia serva Hagen en Selys y Oxyagrion chapadense Costa (Coenagrionidae), Neoneura ethela Williamson (Protoneuridae), Progomphus costalis Hagen en Selys (Gomphidae), Elasmothemis constricta (Calvert), Erythrodiplax basalis (Kirby), Erythrodiplax media Borror, Micrathyria hypodidyma Calvert, Micrathyria ringueleti Rodrigues Capitulo, Orthemis ambinigra Calvert y Perithemis icteroptera (Selys en Sagra) (Libelullidae).A list of 70 species known to occur in Uruguay is given. Fourteen species are new country records: Mnesarete pruinosa (Hagen in Selys) (Calopterygidae), Acanthagrion lancea Selys, A. peruvianum Leonard, Argia serva Hagen in Selys, and Oxyagrion chapadense Costa (Coenagrionidae), Neoneura ethela Williamson (Protoneuridae), Progomphus costalis Hagen in Selys (Gomphidae), Elasmothemis constricta (Calvert), Erythrodiplax basalis (Kirby), Erythrodiplax media Borror, Micrathyria hypodidyma Calvert, Micrathyria ringueleti Rodrigues Capitulo, Orthemis ambinigra Calvert, and Perithemis icteroptera (Selys in Sagra) (Libelullidae).

Se comparan las comunidades de Chironomidae en dos áreas, una ubicada en la provincia biogeográfica del Monte y otra en las Yungas (en dos niveles altitudinales, bajo o selva montana y alto o bosque de aliso). Se presenta por primera vez una lista de taxones presentes en el área que incluye 15 géneros pertenecientes a cinco subfamilias. Los sitios estudiados en la región del Monte se caracterizaron por altas densidades de Pentaneura sp., Parametriocnemus sp. y Podonominae spp.; Lopescladius sp. apareció sólo en Yungas (altas y bajas). Pseudochironomus sp. y Orthocladiinae 1 caracterizaron el nivel alto de las Yungas, mientras que Onconeura sp. y Rheotanytarsus sp. caracterizaron los sitios de Yungas bajas. Los sitios de mayor altura (en Monte y Yungas altas) comparten la presencia de los taxones estenotérmicos fríos Podonominae y Diamesinae.Chironomid communities in two geographic areas were studied: one from the biogeographic province of Monte, and the other from Yungas (at two altitudinal levels, low mountain jungle and the high mountain forest). A taxonomic list is firstly presented for the region, including 15 genera in five subfamilies. The studied sites from Monte region were characterized by high densities of Pentaneura sp., Parametriocnemus sp., and Podonominae spp. Lopescladius sp. appeared only in Yungas (both low and high levels). Pseudochironomus sp. and Orthocladiinae 1 are characteristic of the higher levels in Yungas , while lower Yungas sites showed higher densities of Onconeura sp. and Rheotanytarsus sp. The highest sites (from Monte and higher Yungas) shared the occurrence of the cold stenothermic taxa Podonominae and Diamesinae.

No presente trabalho são apresentados novos registros da superfamília Ephemerelloidea para o Brasil. São também apresentadas chaves de identificação para os adultos e ninfas de todas as famílias, gêneros e espécies documentadas para o país. Os gêneros incluídos nesse trabalho são: Amanahyphes Salles & Molineri (1 espécie), Coryphorus Peters (1 espécie), Leptohyphes Eaton (5 espécies), Leptohyphodes Ulmer (1 espécie), Macunahyphes Dias, Salles & Molineri (1 espécie), Melanemerella Ulmer (1 espécie), Traverhyphes Molineri (4 espécies), Tricorythodes Ulmer (6 espécies), Tricorythopsis Traver (9 espécies).In the present paper new records of the superfamily Ephemerelloidea are presented from Brazil. Keys to the identification of adults and nymphs of all documented families, genera and species in the country are also presented. The genera included are: Amanahyphes Salles & Molineri (1 species), Coryphorus Peters (1 species), Leptohyphes Eaton (5 species), Leptohyphodes Ulmer (1 species), Macunahyphes Dias, Salles & Molineri (1 species), Melanemerella Ulmer (1 species), Traverhyphes Molineri (4 species), Tricorythodes Ulmer (6 species), and Tricorythopsis Traver (9 species).

Adults of both sexes of Cercobrachys peruanicus Soldán are described for the first time and the genus and species are reported from Bolivia . Diagnoses, illustrations, and environmental data are provided. Adults of C. peruanicus can be distinguished from the other species of the genus by the following combination of characters: many (8-16) cross veins in the fore wings, penes lobes completely fused, with posterior margin straight, and styliger plate with a broad median emargination posteriorly.Se describen por primera vez los adultos de ambos sexos de Cercobrachys peruanicus Soldán. El género y la especie son registrados por primera vez para Bolivia. Se proveen diagnosis, ilustraciones y datos ambientales. Los adultos de C. peruanicus pueden distinguirse de las otras especies del género por la presencia de numerosas (8-16) venas transversas en las alas anteriores, completa fusión de los lóbulos peneanos, penes con margen posterior recto, placa estilígera con una emarginación mediana ancha en el margen posterior, entre otros caracteres.

The new species Caenis tarapoto is described from male imagos collected in the Amazonas region from Colombia. This new species is characterized by a dark brown general coloration, presternal triangle anteriorly pointed, forelegs 0.7-0.9 times length of body, forceps apically pointed, central sclerite of styliger plate elongated, penes with gently convex posterior margin and with lobes of penes completely fused and projected laterally.La nueva especie Caenis tarapoto es descripta a partir de imagos machos colectados en la región Amazónica de Colombia. Esta nueva especie se caracteriza por una coloración general castaña oscura, triángulo prosternal aguzado anteriormente, patas anteriores 0.7-0.9 veces la longitud del cuerpo, forceps aguzados en el ápice, esclerito central de la placa estilígera elongado, penes con margen posterior suavemente convexo y con lóbulos peneanos completamente fusionados y proyectados lateralmente.

Se presenta la primera lista de especies de Odonata para la provincia de Tucumán. Se registraron 73 especies, de las cuales 13 son nuevos registros para la provincia, contabilizándose 9 especies de Anisoptera (Aeshnidae: Gynacantha adela, Remartinia luteipennis; Gomphidae: Phyllocycla argentina; Corduliidae: Gomphomacromia nodisticta; Libellulidae: Brechmorhoga nubecula, Erythemis attala, Erythrodiplax nigricans, Libellula herculea y Micrathyria venezuelae) y 4 especies de Zygoptera (Coenagrionidae: Enallagma novaehispaniae; Lestidae: Lestes dichrostigma, L. pictus y L. spatula). La mayoría de las localidades de colecta están ubicadas en la ecorregión de Yungas. Los registros de Chaco, Monte y Prepuna son escasos o ausentes con lo cual se hace necesario enfocar futuras investigaciones en estas áreas. Catorce de las 73 especies presentes en la provincia se conocen sólo de adultos, por lo que se hace necesaria la cría y asociación de larvas.

The present study was conducted to assess the effect of rainbow trout introduction on benthic invertebrate communities, stratified as epibenthos and infauna. Two main questions are explored: 1) do the trout-invaded streams show a different community structure than the streams with autochthonous fish?, and 2) does the presence of trout affect differentially the epibenthos and the infauna? Epibenthic and infaunal samples, drift samples and fish stomach content were sampled four times from three stations to assess the impact of rainbow trout (Oncorhynchus mykiss) on the invertebrate aquatic fauna. Only one species of native fish was recorded in the studied sites, the siluriform Trichomycterus corduvense. Both fish species were found always in allopatry. The trout-invaded site has a different community structure than the other streams with a much lower abundance of large and active epibenthic taxa (e.g., Perlidae, Gripopterygidae, Hydropsychidae, Leptoceridae, Elmidae adults) and an increase in the importance of infaunal organisms (Chironomidae, Oligochaeta). Diversity indices showed alternating and opposite high and low values along time in trout-free and invaded sites.

ABSTRACT Three new species of Leptohyphes Eaton, 1882 (Ephemerotera: Leptohyphidae) are described, diagnosed and illustrated from nymphs collected in Colombia. Geographical ranges and ecological notes relating important environmental variables are given for each species. Leptohyphes andina sp. nov. is characterized by: forefemur length / maximum width 1.8-1.9, fore and hind margin of middle and hind femora with strong spine-like setae on elevated sockets, femoral surface covered by small pale spots, apex of femora with anterior margin roundly projected distally, tarsal claw only with 3-4 marginal denticles, pronotum with triangular lateral projection, hind wing pads present in female, gill formula 3/5/5/5/2, gill V with ventral extension on dorsal lamella. Leptohyphes quimbaya sp. nov. presents the following characters: body covered by hair-like setae, with paired short and blunt tubercles on abdominal terga V-IX, femora wide (forefemur length/ maximum width 1.6), fore and hind margin of femora with tiny spine-like setae, tarsal claws with 2-3 marginal denticles, pronotum with triangular (but apically blunt) lateral projection, hind wing pads present in females, gill formula 3/7/7/5/2, gill V without ventral extension on dorsal lamella. Leptohyphes calarca sp. nov. is distinguished by: pilose body, slender femora (forefemur length / maximum width 2.3), foremargin of middle and hind femora without setae, tarsal claws with 5 marginal denticles and 1 submarginal subapical denticle, pronotum strongly projected laterally, fore wingbuds blackish, hind wing pads present in females, gill formula 3/4/4/3/1, gill V with ventral extension on dorsal lamella.