Resumo Apresenta-se pela primeira vez uma chave pictórica para identificação dos adultos aquáticos e semiaquáticos de Curculionidae associados às macrófitas aquáticas do Pantanal mato-grossense e da Amazônia, baseada no estudo de 13.252 exemplares pertencentes a duas famílias de Curculionoidea (Brentidae e Curculionidae), seis subfamílias, oito tribos, 22 gêneros e 24 espécies, a maioria pertencente a Tanysphyrini (Curculionidae, Brachycerinae). A chave proposta pode ser extrapolada para a fauna da Região Neotropical devido a ampla distribuição das espécies incluídas, as quais são discutidas em relação aos estudos taxonômicos, biogeográficos e ecológicos. Apresentase Apresenta se matogrossense mato grossense Amazônia 13252 13 252 13.25 Brentidae Curculionidae, , Curculionidae) subfamílias tribos 2 (Curculionidae Brachycerinae. Brachycerinae . Brachycerinae) incluídas taxonômicos ecológicos 1325 1 25 13.2 132 13.

Abstract A pictorial key for the identification of aquatic and semiaquatic adults of Curculionidae associated with aquatic macrophytes from the Pantanal of Mato Grosso and the Amazon is presented for the first time based on the study of 13,252 specimens belonging to the two families of Curculionoidea (Brentidae and Curculionidae), six subfamilies, eight tribes, 22 genera and 24 species, most belonging to Tanysphyrini (Curculionidae, Brachycerinae). This key can be extrapolated to the Neotropical Region fauna due to the wide distribution of the included species, which is discussed in relation to taxonomic, biogeographical, and ecological studies. 13252 13 252 13,25 Brentidae Curculionidae, , Curculionidae) subfamilies tribes 2 species (Curculionidae Brachycerinae. Brachycerinae . Brachycerinae) taxonomic biogeographical studies 1325 1 25 13,2 132 13,

RESUMO Lontra longicaudis é um predador semi-aquático com dieta principal a base de peixes e crustáceos, mas que oportunisticamente pode predar mamíferos, aves e répteis. Na Amazônia, essa espécie ocorre em simpatria com Paleosuchus trigonatus, uma das menores espécies de crocodilianos, apresentando como possível meio de defesa uma pele extremamente rígida, o que faz com que adultos tenham poucos predadores. Aqui nós relatamos o primeiro caso documentado de predação de P. trigonatus por L. longicaudis. semiaquático semi aquático crustáceos mamíferos répteis Amazônia crocodilianos rígida predadores P L

ABSTRACT Lontra longicaudis is a semi-aquatic predator which mainly feeds on fish and crustaceans, but which can opportunistically predate mammals, birds, and reptiles. In the Amazon, this species is sympatric with Paleosuchus trigonatus, one of the smallest species of crocodilians, whose possible means of defense is a very rigid skin, which causes adults to have few predators. Here we report the first documented case of predation of P. trigonatus by L. longicaudis. semiaquatic semi aquatic crustaceans mammals birds reptiles Amazon crocodilians skin predators P L

Abstract Alismataceae is a family of aquatic or semi-aquatic plants with a wide distribution in humid areas, occurring in tropical, subtropical and temperate regions. Although Brazil accounts for 50% of the entire species diversity of this family, there are many gaps in knowledge of the species and their distribution, especially in the southern region of the country. This paper presents the study of Alismataceae species in the Biomes Pampa and Atlantic Forest of Rio Grande do Sul, highlighting taxonomic, ecological and distribution aspects. This study was based on the morphological analysis of specimens deposited in online data repositories and herbaria, as well as specimens collected in wetlands in the extreme south of Brazil. Ten taxa were registered for Rio Grande do Sul state: Echinodorus grandiflorus, E. longiscapus, E. macrophyllus, E. reptilis, E. uruguayensis, Helanthium tenellum, Hydrocleys nymphoides, Sagittaria lancifolia, S. rhombifolia and S. montevidensis. As a result of this study, an identification key for the taxa, morphological descriptions, images of the species and distribution maps are presented. Ecological and phenological data are also provided. semiaquatic semi areas tropical regions 50 country taxonomic aspects herbaria state grandiflorus E longiscapus macrophyllus reptilis uruguayensis tenellum nymphoides lancifolia S montevidensis descriptions presented provided 5

Resumo Alismataceae é uma família de plantas aquáticas ou semiaquáticas com ampla distribuição em áreas úmidas, ocorrendo em regiões tropicais, subtropicais e temperadas. Embora o Brasil seja responsável por 50% de toda a diversidade da família, existem muitas lacunas no conhecimento das espécies e sua distribuição, principalmente na região sul do país. Este trabalho apresenta o estudo das espécies de Alismataceae nos Biomas Pampa e Mata Atlântica do Rio Grande do Sul, destacando aspectos taxonômicos, ecológicos e de distribuição. O estudo foi baseado na análise morfológica de espécimes depositados em repositórios de dados online e herbários, bem como espécimes coletados em áreas úmidas do extremo sul do Brasil. Foram registrados 10 táxons para o Rio Grande do Sul: Echinodorus grandiflorus, E. longiscapus, E. macrophyllus, E. reptilis, E. uruguayensis, Helanthium tenellum, Hydrocleys nymphoides, Sagittaria lancifolia, S. rhombifolia e S. montevidensis. Este estudo apresenta uma chave de identificação dos táxons, descrições morfológicas, imagens das espécies e mapas de distribuição. Dados ecológicos e fenológicos também são fornecidos. tropicais temperadas 50 país Sul taxonômicos herbários 1 grandiflorus E longiscapus macrophyllus reptilis uruguayensis tenellum nymphoides lancifolia S montevidensis morfológicas fornecidos 5

Resumen Esta investigación registra las especies de chinches semiacuáticas (Hemiptera: Gerromorpha) de la franja costera del Parque Nacional Natural Utría (Chocó, Colombia). Durante una salida de campo en el mes de febrero de 2019, se recolectaron individuos en diferentes tipos de hábitats: ensenada, manglar, playa y quebrada. En cada hábitat se hicieron recolectas por medio de redes entomológicas acuáticas, con un esfuerzo de muestreo de dos horas/hombre. Se lograron recolectar 192 individuos, donde el 93% fue determinado a especie y el 7% a género. Así, se lograron registrar 11 especies y dos morfoespecies, cuatro especies para la familia Gerridae y siete para la familia Veliidae. Las morfoespecies pertenecen a los géneros Rhagovelia y Microvelia (Veliidae). Se resalta el registro de cuatro especies endémicas para el Chocó biogeográfico que han sido descritas recientemente: Rhagovelia molanoi, Rhagovelia nuqui, Rhagovelia utria y Stridulivelia chocoana. Los resultados de este proyecto estuvieron dentro del Marco de la revisión taxonómica de la familia Hydrometridae para Colombia.

Abstract This research records the species of semi-aquatic bugs (Hemiptera: Gerromorpha) from the coastal strip of the Utría National Natural Park (Chocó, Colombia). During a field trip in February 2019, individuals were collected in different habitat types: cove, mangrove, beach and stream. In each habitat, collections were made using aquatic entomological nets, with a sampling effort of two hours/man. A total of 192 individuals were collected, where 93% were determined to species and 7% to genus. Thus, 11 species and two morphospecies were recorded, four species for the Gerridae family and seven for the Veliidae family. The morphospecies belong to the genera Rhagovelia and Microvelia (Veliidae). Four species endemic to the biogeographic Chocó that have been recently described are highlighted: Rhagovelia molanoi, Rhagovelia nuqui, Rhagovelia utria and Stridulivelia chocoana. The results of this project were within the framework of the taxonomic revision of the family Hydrometridae for Colombia.

ABSTRACT Lontra longicaudis Olfers, 1818 is a semi-aquatic carnivore widely distributed in the Neotropical region. Understanding their diet contributes to an indirect understanding of their ecology and the composition of the local fauna. To this end, we analyzed 109 fecal samples and identified 238 morphological structures; these samples were collected between May 2006 and September 2007 from the Santa Lúcia Biological Station (SLBS) in southeastern Brazil. The area is intersected by the Timbuí River, which arrives at the site after crossing the urban perimeter of the city of Santa Teresa in the state of Espírito Santo. We found a predominance of fish in the otters’ diets (82%), mainly cichlids (50%), which are fish with sedentary habits and low mobility levels. The crustacean Trichodactylus fluviatilis Latreille, 1828 was the third most consumed taxon; this occurred mainly during the rainy season, corresponding to the crustacean’s reproductive period, when it is more vulnerable to predation. Otters exhibited a seasonal variation in their prey selectivity. Furthermore, they displayed opportunistic foraging behavior, as the most preyed fish were those with both low mobility and a high frequency in the environment, followed by fish with high mobility and high frequency, and then those with low mobility and low frequency. We concluded that the feeding habits of the otters in the SLBS are in line with the optimal foraging theory since prey selection was optimized through the balance between net energy gained and the energy costs of foraging. Olfers 181 semiaquatic semi aquatic region fauna end 10 23 structures 200 (SLBS Brazil River Santo 82%, 82 82% , (82%) 50%, 50 50% (50%) levels Latreille 182 taxon season crustaceans s period predation selectivity Furthermore behavior environment 18 1 2 20 8 (82% 5 (50% (82 (50 (8 (5 (

Abstract The giant otter (Pteronura brasiliensis) is a semiaquatic carnivore and a top predator in the trophic chain, considered a sentinel of freshwater ecosystems. Ticks are common ectoparasites of worldwide distribution and potential vectors of diseases. In this study, we report the ectoparasitism by ticks on a giant otter carcass found during monitoring activity at the Negro River, that holds a viable population of this endangered species in the Brazilian Pantanal. A total of three tick specimens were collected: two adults were identified as Amblyomma sculptum and a nymph as Amblyomma spp. There is a lack of information about the health of free-ranging giant otters and this report contributes to elucidate some of the host-parasite relationships, although much more research is needed to expand the knowledge about which kinds of pathogens are circulating in the species, especially among those transmitted by ticks. Pteronura brasiliensis chain ecosystems diseases study River Pantanal collected spp freeranging free ranging hostparasite host parasite relationships

Resumo A ariranha (Pteronura brasiliensis) é um carnívoro semiaquático e um predador de topo na cadeia trófica, considerada sentinela dos ecossistemas de água doce. Os carrapatos são ectoparasitos comuns com distribuição mundial e potenciais vetores de doenças. Neste estudo, foi relatado o ectoparasitismo por carrapatos em uma carcaça de ariranha encontrada durante atividade de monitoramento no Rio Negro, no Pantanal brasileiro, que abriga uma população viável desta espécie ameaçada de extinção. Um total de três espécimes de carrapatos foram coletados: dois adultos foram identificados como Amblyomma sculptum e uma ninfa como Amblyomma spp. Há uma lacuna de informações sobre a saúde das ariranhas de vida livre e este relato contribui para elucidar algumas das relações parasita-hospedeiro, embora ainda seja necessária mais pesquisa para ampliar o conhecimento sobre quais tipos de patógenos estão circulando na espécie, especialmente entre os transmitidos por carrapatos. Pteronura brasiliensis trófica doce doenças estudo Negro brasileiro extinção coletados spp parasitahospedeiro, parasitahospedeiro parasita hospedeiro, hospedeiro parasita-hospedeiro

Abstract The aquatic long toed beetle Postelichus musgravei (Hinton, 1935) (Coleoptera: Byrrhoidea: Dryopidae) is registered for the state of Nuevo León, Mexico, this being the first record of the family Dryopidae for this state, as well as the northernmost record of this species. Furthermore, a listing of species of the family Dryopidae from Mexico and an identification key for the genera found in continental North America (Canada, EUA, and Mexico) are presented.

Resumen Se registra al escarabajo acuático de dedos largos Postelichus musgravei (Hinton, 1935) (Coleoptera: Byrrhoidea: Dryopidae) para el estado de Nuevo León, México, siendo, el primer registro de la familia Dryopidae para este estado, así como el registro más norteño de esta especie. Además, se presenta un listado de especies de la familia Dryopidae de México y una clave de identificación para los géneros encontrados en Norteamérica continental.

Resumen La subfamilia Donaciinae se caracteriza del resto de los crisomélidos porque sus larvas son acuáticas y los adultos semiacuáticos. En México se han registrado los géneros Donacia Fabricius, Neohaemonia Székessy y Plateumaris Thomson. El estudio de esta subfamilia en México es limitado, por lo que en el presente trabajo se presenta una clave para los géneros distribuidos en el país y una diagnosis e ilustraciones de las especies con el objetivo de proveer una herramienta que facilite la identificación de los Donaciinae mexicanos que pudieran encontrarse en colecciones o en material de recientes colectas, y así incrementar el conocimiento taxonómico y ecológico de esta subfamilia. Se reporta a Neohaemonia flohri (Jacoby) por primera vez en Tlaxcala.

Abstract The subfamily Donaciinae is distinguished from the rest of the leaf beetles by the aquatic larvae and semiaquatic adults. In Mexico, there are records for Donacia Fabricius, Neohaemonia Székessy, and Plateumaris Thomson. The study of this subfamily in Mexico is poor; thus, in the present work, a dichotomic key for the genera distributed in the country, a diagnosis, and photographs for the species are provided, with the objective of providing a tool that facilitates the identification of the Mexican Donaciinae that could be found in collections or in material from recent collects and thus increase the taxonomic and ecological knowledge of this subfamily. In addition, Neohaemonia flohri (Jacoby) is reported for the first time in Tlaxcala.

Abstract: There are two native mustelids among the species of semiaquatic mammals present in Chile are two native mustelids, the chungungo (Lontra felina) and the river otter (Lontra provocax). Also, two exotic and invasive semiaquatic mammals have been introduced into the country, the American mink (Neovison vison) and the American beaver (Castor canadensis). These latter species are widely recognized for the negative effects they have on ecosystems and native species. All these species include in their southernmost distribution the Tierra del Fuego archipelago, in the region of Magallanes, however there are few systematically documented records of their presence in inland waterways. This study describes the presence of American mink by camera traps monitoring on Albatros Islet, in Almirantazgo Sound during six summer seasons, from 2016 - 2017 to 2021 - 2022, with sampling efforts (EM) that varied between 499 during the 2018-2019 season and 3,658 during 2020-2021. This study informs the first record of beaver and river otter presence for Albatros Islet, also confirming the reproduction of the latter species in this one. From the records obtained, relative abundance indices (RAI) were calculated for each species: American mink (range=0-8), river otter (range=0.08 - 5) and American beaver (range=0-0.144). These findings are highly relevant in the context of the conservation targets of the Multiple Use Marine Protected Area Seno Almirantazgo (MU-MPA SA), as they are a key input for informed decision making and effective management of the protected area. They also highlight the importance of implementing and sustaining systematic monitoring efforts of both the conservation targets of the area and the threats they face.

Resumen: Entre las especies de mamíferos con hábitos semiacuáticos presentes en Chile se encuentran dos mustélidos nativos, el chungungo (Lontra felina) y el huillín (Lontra provocax). Asimismo, han sido introducidos dos mamíferos semiacuáticos exóticos e invasores en el país, el visón americano (Neovison vison) y el castor americano (Castor canadensis). Estas últimas especies son ampliamente reconocidas por los efectos negativos que provocan sobre los ecosistemas y las especies nativas. Si bien todas estas especies incluyen en su distribución más austral al archipiélago de Tierra del Fuego, en la región de Magallanes, existen pocos antecedentes documentados sistemáticamente sobre su presencia en canales interiores. En este estudio se describe la presencia de mamíferos semiacuáticos mediante el monitoreo con cámaras trampa en el Islote Albatros, en el Seno Almirantazgo entre las temporadas estivales 2016 - 2017y 2021 - 2022, con esfuerzos de muestreo (EM) que variaron entre 499 durante la temporada 2018-2019 y 3.658 en 2020-2021. A partir de los registros obtenidos se calcularon los índices de abundancia relativa (IAR) para cada una de las especies registradas: visón americano (rango=0-8), huillín (rango=0,08 - 5) y castor americano (rango=0-0,144). Se destaca el primer registro de presencia de castor y huillín para el Islote Albatros, confirmándose además la reproducción de esta última especie en este. Estos hallazgos resultan de gran relevancia en el contexto de los objetos de conservación del Área Marina Costera Protegida de Múltiples Usos (AMCP-MU) Seno Almirantazgo, pues son un aporte clave para la toma de decisiones informada y el manejo efectivo de esta área protegida. También resaltan la importancia de implementar y sostener esfuerzos de monitoreo sistemáticos tanto de los objetos de conservación del área como de las amenazas que enfrentan.

Resumen Introducción: Los hemípteros semiacuáticos son insectos que podrían ser de los mejores indicadores de la calidad del ambiente acuático, específicamente en cuanto al contenido de sustancias que rompen la tensión superficial. Sin embargo, no existen estudios que evalúen cómo estos insectos se ven afectados por cambios en la tensión superficial del agua. Objetivo: Determinar el efecto que tienen las aguas jabonosas sobre la capacidad de locomoción de tres especies de hemípteros semiacuáticos neotropicales. Métodos: Desde agosto hasta noviembre 2020, realizamos experimentos ex situ, con nueve grupos de diez individuos de la familia Veliidae (N = 90) y Gerridae (N = 90), en donde cada grupo individualmente, fue sometido a la entrada de aguas jabonosas durante tres minutos. Para esto, diseñamos un acuario que consistía en tres cajas de plástico a diferentes alturas, conectadas entre sí, de modo que se generaba un flujo de corriente. Utilizamos jabón en polvo para ropa, jabón líquido para manos, y jabón en barra para platos. De cada tipo de jabón preparamos una concentración baja (9 ppm), media (50 ppm) y alta (200 ppm). Mediante grabaciones, registramos el tiempo que duraron los hemípteros en el agua, así como su capacidad para salir de la misma, y si se hundían o no. Resultados: Encontramos que, sin importar el tipo de jabón, el tiempo que permanecen los hemípteros en el agua contaminada, se reduce drásticamente conforme aumenta la concentración, pero dicho impacto varía según la especie, siendo Rhagovelia solida (familia Veliidae) menos afectada por la contaminación en comparación con Platygerris caeruleus y Potamobates unidentatus (familia Gerridae). Conclusión: El uso de estos táxones como indicadores del grado de contaminación de los ríos por detergentes y jabones, puede ser muy útil, sobre todo si se toma en cuenta las diferencias de sensibilidad según la familia o género del grupo.

Abstract Introduction: Semiaquatic hemipterans are insects that may be among the best indicators of the quality of the aquatic environment, specifically in terms of the content of substances that break surface tension. However, no studies are evaluating how these insects are affected by changes in the surface tension of the water. Objective: To determine the effect of soapy water on the locomotion ability of three species of neotropical semiaquatic hemipterans. Methods: From August to November 2020, we conducted ex situ experiments, with nine groups of ten individuals of the family Veliidae (N = 90) and Gerridae (N = 90), where each group individually, was subjected to the entry of soapy water for three minutes. For this, we designed an aquarium consisting of three plastic boxes at different heights, connected to each other, so that a current flow was generated. We used powdered laundry soap, liquid hand soap, and bar soap for dishes. For each type of soap we prepared a low (9 ppm), medium (50 ppm) and high (200 ppm) concentration. By means of recordings, we recorded the time the hemipterans spent in the water, as well as their ability to get out of the water, and whether or not they sank. Results: We found that, regardless of the type of soap, the time spent by hemipterans in contaminated water decreases drastically as the concentration increases, but the impact varies by species, with Rhagovelia solida (family Veliidae) being less affected by pollution compared to Platygerris caeruleus and Potamobates unidentatus (family Gerridae). Conclusions: The use of these taxa as indicators of the degree of contamination of rivers by detergents and soaps can be very useful, especially if we take into account the differences in sensitivity according to the family or gender of the group.

ABSTRACT The subfamily Veliinae (Heteroptera: Gerromorpha: Veliidae) includes ten genera worldwide, seven of which are endemic to the American continent. Here, we provide a revision of Platyvelia Polhemus and Polhemus, 1993, which is distributed from the United States to northern Argentina, and included nine valid species prior to this study. Six species are redescribed, the synonymies of P. egregia (Drake and Harris, 1935) and P. verdica (Drake, 1951) with P. brachialis (Stål, 1860) are proposed, a lectotype is designated for P. annulipes, and two species groups are erected based on male characters: the P. annulipes group and the P. brachialis group. Keys to the species groups and species within each group, photos, and distribution maps are also included.

RESUMEN El presente trabajo resume las principales tendencias en el conocimiento de los gerromorfos en el ámbito mundial, relacionadas con los avances en sistemática molecular, su uso como indicadores de ambientes cambiantes y la ampliación del saber en varios países Neotropicales. Se revisa la información publicada sobre los Gerromorpha en la última década (2009-2019) en Colombia y se contemplan los diferentes aspectos biológicos, taxonómicos, ecológicos y de distribución geográfica. El desarrollo y el progreso sobre los heterópteros semiacuáticos son la base del emprendimiento de otras investigaciones en Colombia y en el Neotrópico, especialmente en regiones como Mesoamérica y Sudamérica.

ABSTRACT The present work summarizes the main worldwide trends in the Gerromorphans knowledge which are related to the advances in molecular systematics, their use as indicators of changing environments, and knowledge broadening in several Neotropical countries. The information published about Gerromorphans in last decade (2009-2019) in Colombia is reviewed, and the different biological, taxonomic, ecological and geographical distribution aspects are considered. The development and progress about semiaquatic Heteroptera are the base to undertake further investigations in Colombia and at the Neotropic, especially in regions such as Mesoamerica and South America.

Resumen Los ecosistemas secos del Patía, en los Departamentos de Cauca y Nariño, son unos de los más degradados y altamente vulnerables frente al cambio climático en Colombia, y son áreas prioritarias para conservación. Determinamos las especies de heterópteros acuáticos y semiacuáticos, Nepomorpha y Gerromorpha, que habitan en los ecosistemas acuáticos de este bosque seco, basado en la revisión de publicaciones y de la colección de Entomología PSO-CZ. Se registraron 27 especies: Gerromorpha, 21 especies y Nepomorpha, 6 especies.

Abstract The dry forests of the Patía River, in the Departments of Cauca and Nariño, are some of the most degraded and highly vulnerable ecosystems facing climate change in Colombia,and they are considered high priority areas for conservation. We identified aquatic and semiaquatic heteropterans (Nepomorpha and Gerromorpha) that inhabit the aquatic ecosystems in these dry forests, based on literature and on the PSO-CZ Entomological Collection. There were 27 species: Gerromorpha, 21 species and Nepomorpha, 6 species.

Abstract: As a result of an extensive revision of literature, 8 genera and 71 species of Asteraceae, endemic to Mexico and of aquatic and semiaquatic habitat, are presented. These represent 13 tribes and 37 genera of the family. Eighteen species are only known from the type location and surrounding area and 4 of them have not been recollected for more than a century. All are herbaceous emergent plants; the majority are perennials while the annuals grow mostly in temporary pools. Most of these species are found in the Sierra Madre Occidental and in the Transmexican Volcanic Belt, at altitudes above 1800 m, in small isolated wetlands. Aquatic endemic Compositae are scarce in southern Mexico and there are no reports from the state of Tabasco, nor the entire Yucatan Peninsula. In view of their rarity, it is estimated that 43 species are higihly susceptible to extinction.

Resumen: Mediante una amplia revisión de la literatura se define la existencia de ocho géneros y de 71 especies de Asteraceae que califican como acuáticas o subacuáticas y solo se conocen del territorio de la República. Pertenecen a 13 tribus y 37 géneros de la familia. De los 71 elementos, 18 se registran únicamente de la localidad tipo y sus alrededores y cuatro no se han vuelto a colectar durante más de un siglo. Todas son plantas herbáceas enraizadas y emergentes; predominan las perennes, mientras que las anuales habitan principalmente en charcos temporales. En su gran mayoría se distribuyen en la Sierra Madre Occidental y en el Eje Volcánico Transversal, en altitudes superiores a 1800 m, en humedales pequeños y geográficamente aislados. Es escasa su presencia en el sur de México y se carece de registros de Tabasco, al igual que de la península de Yucatán. Dada su rareza, se estima que 43 de las especies se encuentran altamente vulnerables a la extinción.

RESUMEN El objetivo del trabajo fue determinar la composición, diversidad, abundancia, distribución geográfica y altitudinal de las especies del género Rhagovelia de ecosistemas lóticos de los municipios de Orito, La Hormiga y San Miguel (rango altitudinal 310 a 620 m s.n.m.) del piedemonte Andino-Amazónico. Las muestras fueron colectadas en junio del 2017, a través del uso de redes entomológicas. Como resultado se determinaron seis especies de Rhagovelia, los índices de diversidad mostraron altos valores (índices Shannon-Wiener: 1,43, Simpson: 3,61 y Margalef: 0,76) que indican la diversidad y el alto número de individuos por especie; R. mocoa (38 %) y R. spinosa (31 %) fueron las especies más abundantes. Además se compararon estos resultados con los de la cuenca alta del río Putumayo, municipios Mocoa-Puerto Asis.

ABSTRACT The purpose of this work was to determine the composition, diversity, abundance, and geographic and altitudinal distribution of the species of genus Rhagovelia from lotic ecosystems in the municipalities of Orito, La Hormiga and San Miguel (altitudinal range 310 to 620 m asl) belonging to Andean-Amazon piedmont. Samples were collected in June 2017, using entomological nets. As a result there were determined six species of the genus Rhagovelia, the diversity indices showed high values (Shannon-Wiener: 1,43, Simpson: 3,61 and Margalef: 0,76) that indicate the diversity and high number of individuals for specie; R. mocoa (38 %) and R. spinosa (31 %) were the most abundant species. Additionally the results were compared with the Upper basin of the Putumayo River, Mocoa-Puerto Asis municipalities.