A key to the known larvae of south american Elmidae (Coleoptera: Byrrhoidea), with a description of the mature larva of Macrelmis saltensis Manzo.

A key to identify the known mature larvae of the South American genera of the family Elmidae is provided. The key includes seven genera presently assigned to the subfamily Larainae and 15 genera assigned to the subfamily Elminae. New distributional data for all genera and a checklist of described larvae are also included. The mature larva of Macrelmis saltensis Manzo is described and illustrated for the first time, and compared to other known larvae of the granigera species-group. Distributional notes for M. saltensis increase its known range to the north, this being the first citation of the species for Bolivia. Macrelmis isis (Hinton) is also cited for the first time for Bolivia.Fil: Manzo, María Verónica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto de Biodiversidad Neotropical. Universidad Nacional de Tucumán. Facultad de Ciencias Naturales e Instituto Miguel Lillo. Instituto de Biodiversidad Neotropical. Instituto de Biodiversidad Neotropical; ArgentinaFil: Archangelsky, Miguel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Centro de Investigación Esquel de Montaña y Estepa Patagóica. Universidad Nacional de la Patagonia "San Juan Bosco". Facultad de Ciencias Naturales - Sede Esquel. Centro de Investigación Esquel de Montaña y Estepa Patagónica; Argentin

Description of the larval stages of Gymnochthebius jensenhaarupi and phylogenetic analysis of the relationships with other species of the subfamily Ochthebiinae (Coleoptera: Hydraenidae)

The three larval instars of Gymnochthebius jensenhaarupi (Knisch, 1924) are described and illustrated, including a detailed analysis of their chaetotaxy and porotaxy. The specimens used in this study were collected with adults of G. jensenhaarupi and have been identified as such by association. Comparative notes on the morphology of these larvae with other species of the subfamily Ochthebiinae are given. A hypothesis of phylogenetic relationships between G. jensenhaarupi and other members of Ochthebiinae with thoroughly described larvae is presented. The monophyly of Ochthebiinae is supported by additional larval features. On the other hand Ochthebius, as currently composed, seems to by paraphyletic. Gymnochthebius Orchymont, 1943 is confirmed as the sister group of Aulacochthebius Kuwert, 1887.Fil: Delgado, Juan A.. Universidad de Murcia; EspañaFil: Archangelsky, Miguel. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentin

Larval and pupal morphology of Pyractonema nigripennis Solier (Coleoptera: Lampyridae: Photinini) and comparative notes with other Photinini larvae

The last larval stage and pupal stage of Pyractonema nigripennis Solier, an endemic species from southern Chile and Argentina, are described and illustrated. Pyractonema Olivier is included in the tribe Photinini, Subtribe Lucidotina, and the larva and pupa of P. nigripennis are compared to those of Lucidota atra (Olivier) and related lampyrid genera.Fil: Archangelsky, Miguel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de la Patagonia Austral; Argentin

Quetotaxia primaria y morfometría de la cápsula cefálica y apéndices cefálicos del primer estadio larval de Chaetarthria bruchi (Coleoptera: Hydrophilidae: Chaetarthriinae: Chaetarthriini)

The primary chaetotaxy of the head capsule and head appendages of the larvaof Chaetarthria bruchi Balfour-Browne is described for the first time. Morphometric charactersderived from the head capsule and mouthparts are included, together with detailedillustrations of all characters. Chaetotaxy of C. bruchi is compared with that of C. seminulum(Herbst), the only other Chaetarthriini species for which the chaetotaxy has been described.RESUMEN. La quetotaxia primaria de la cápsula cefálica y de los apéndices cefálicos dela larva de Chaetarthria bruchi Balfour-Browne se describen por primera vez. Caracteresmorfométricos derivados de la cabeza y sus apéndices son incluidos junto con ilustracionesdetalladas de todos los caracteres. La quetotaxia de C. bruchi se compara con la de C.seminulum (Herbst), la única otra especie de Chaetarthriini para la cual se ha descripto laquetotaxia.La quetotaxia primaria de la cápsula cefálica y de los apéndices cefálicos de la larva de Chaetarthria bruchi Balfour-Browne se describen por primera vez. Caracteres morfométricos derivados de la cabeza y sus apéndices son incluidos junto con ilustraciones detalladas de todos los caracteres. La quetotaxia de C. bruchi se compara con la de C. seminulum (Herbst), la única otra especie de Chaetarthriini para la cual se ha descripto la quetotaxia.Fil: Archangelsky, Miguel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Centro de Investigación Esquel de Montaña y Estepa Patagónica. Universidad Nacional de la Patagonia "San Juan Bosco". Centro de Investigación Esquel de Montaña y Estepa Patagónica; Argentin

New Hydrophilidae larvae (Coleoptera: Hydrophiloidea):Hemiosus multimaculatus and Chaetarthria bruchi

Los estadios larvales de los hidrofílidos neotropicales Hemiosusmultimaculatus (Jensen–Haarup) y Chaetarthria bruchi Balfour–Browne sondescriptos e ilustrados por primera vez. Se los compara con otras larvas conocidasen esos géneros, y con larvas de géneros relacionados presentes en laregión Neotropical, confirmando que, para estos dos géneros, los caractereslarvales diagnósticos utilizados hasta ahora son estables.The larval stages of the Neotropical hydrophilids Hemiosus multimaculatus (Jensen–Haarup) and Chaetarthria bruchi Balfour–Browne are described and illustrated for the first time. They are compared to the other known larvae of these genera, and also to larvae of related genera known to occur in the Neotropical region, confirming that, for these two genera, the larval diagnostic characters used up to now are consistent.Fil: Archangelsky, Miguel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de la Patagonia "san Juan Bosco". Facultad de Cs.naturales - Sede Esquel. Laboratorio de Ecología Acuatica; Argentin

Description of the Second and Third Instars of Laccornellus lugubris (Aubé) (Coleoptera: Dytiscidae: Hydroporinae)

The second and third instars of Laccornellus lugubris (Aubé) are described and illustrated for the first time, including detailed morphometric and chaetotaxic analyses of the cephalic capsule, head appendages, legs, last abdominal segment, and urogomphi. Laccornellus Roughley and Wolfe shares with Canthyporus Zimmermann a similar shape and secondary setation of the last abdominal segment, the absence of secondary spine-like setae on the lateral margins of the parietal, and the presence of well-developed spinular pectens on the ventral surface of the femora (this last character also is shared with Laccornis Gozis). On the other hand, larvae of Laccornellus differ from those of Canthyporus, Laccornis, and Hydrovatus Motschulsky in the presence of secondary pores on the ventral surface of the prementum and of secondary setae on the tibia, metatarsus, and anterodorsal surface of femur. The known distributional range of L. lugubris is considerably expanded.Fil: Michat, Mariano Cruz. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Biodiversidad y Biologia Experimental. Laboratorio de Entomologia; Argentina. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Oficina de Coordinacion Administrativa Ciudad Universitaria; ArgentinaFil: Archangelsky, Miguel. Universidad Nacional de la Patagonia "San Juan Bosco". Facultad de Ciencias Naturales - Sede Esquel. Departamento de Biología. Laboratorio de Investigaciones en Ecología y Sistemática Animal; Argentina. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Oficina de Coordinacion Administrativa Ciudad Universitaria; Argentin

Spatial variation of water beetle communities in arid and semi-arid Patagonian wetlands and their value as environmental indicators

To evaluate the spatial variation of aquatic beetle assemblages, 26 Patagonian ponds were sampled during late spring (December).  Study sites differed in hydroperiod, hydrology, abiotic features, precipitation, aridity and aquatic plant richness.  15 physico-chemical features were measured and aquatic plants were collected to determine taxonomic richness.  The sampling of the 26 ponds produced 21 aquatic beetle taxa distributed in six families.  All aquatic beetles (adults and larvae) were assigned to functional feeding groups.  A canonical correspondence analysis (CCA) was run to assess relationships between aquatic beetle assemblages and environmental variables.  23% of the variance in aquatic beetle taxa abundance was accounted for by the first three ordination axes.  Moreover, the first two canonical axes accounted for 38.2% and 28.4% of the variation attributable to the environmental variables (annual precipitation, altitude, pond area, aquatic plant richness, pH and conductivity), being conductivity and altitude the most important.  A parsimony analysis was performed in order to establish which species could define and/or group some of the communities (sampling sites were treated as taxa and species were treated as characters).  The results of the parsimony analysis suggest that some taxa (Haliplus subseriatus, Gymnochthebius sp., Enochrus darwini, Cyphon sp., Luchoelmis sp.  and Rhantus validus) are useful to define some ponds or groups of ponds.  These species could be used as indicators since beetle distributions are not to be considered random.  Our findings point out that aquatic beetle assemblages could be utilised for wetlands conservation planning since in arid and semiarid Patagonia they are important as water reservoirs and also for cattle rearing.Fil: Epele, Luis Beltran. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de la Patagonia "San Juan Bosco". Facultad de Ciencias Naturales - Sede Esquel. Departamento de Biología. Laboratorio de Investigaciones en Ecología y Sistemática Animal; ArgentinaFil: Archangelsky, Miguel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de la Patagonia "San Juan Bosco". Facultad de Ciencias Naturales - Sede Esquel. Departamento de Biología. Laboratorio de Investigaciones en Ecología y Sistemática Animal; Argentin

The last instar larva and pupa of Ora depressa (Coleoptera: Scirtidae), a marsh beetle with underwater pupation

In this contribution we describe and illustrate for the first time, detailed morphology and chaetotaxy of the last instar larva and the pupa of Ora depressa (Fabricius, 1801), and provide diagnostic characters and information on its biology. The last instar larva of O. depressa exhibits the characters traditionally recognized as diagnostic of the genus, i.e. the tip of the mandible obtuse, and the fourth maxillary palpomere long, almost as long as third palpomere. Ora depressa is characterized by a broadly elliptical body, which is widest at the metanotum, being brownish testaceous in color with several brown spots, having the dorsal surface mostly covered with numerous grooved scale-like setae and also several ungrooved scale-like setae, hair-like setae, club-like setae and pore-like sensilla distributed in a specific pattern, and the femur and tibiotarsus bearing a row of natatorial setae. The last instar larva of Ora depressa can be distinguished from those of the other known species of the genus by lobes of clypeolabrum being as long as wide and socket bristles with 2–6 inner teeth. The pupa of O. depressa differs from those of the other known species of the genus in the absence of pronotal horns and by the place where pupation occurs. Ora depressa pupates underwater, hanging from water’s surface with the aid of the laterally expanded pronotum which bears hydrophobic setation along the lateral margins.Fil: Libonatti, María Laura. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Biodiversidad y Biología Experimental y Aplicada. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Biodiversidad y Biología Experimental y Aplicada; ArgentinaFil: Jorge, Gabrielle. Ministério da Ciência, Tecnologia, Inovações. Instituto Nacional de Pesquisas da Amazônia; BrasilFil: Archangelsky, Miguel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Centro de Investigación Esquel de Montaña y Estepa Patagóica. Universidad Nacional de la Patagonia "San Juan Bosco". Facultad de Ciencias Naturales - Sede Esquel. Centro de Investigación Esquel de Montaña y Estepa Patagónica; Argentina. Universidad Nacional de la Patagonia "San Juan Bosco". Facultad de Ciencias Naturales - Sede Esquel. Departamento de Biología. Laboratorio de Investigaciones en Ecología y Sistemática Animal; ArgentinaFil: Michat, Mariano Cruz. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Biodiversidad y Biología Experimental y Aplicada. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Biodiversidad y Biología Experimental y Aplicada; Argentin

Spatial variation of water beetle communities in arid and semi-arid Patagonian wetlands and their value as environmental indicators

To evaluate the spatial variation of aquatic beetle assemblages, 26 Patagonian ponds were sampled during late spring (December).  Study sites differed in hydroperiod, hydrology, abiotic features, precipitation, aridity and aquatic plant richness.  15 physico-chemical features were measured and aquatic plants were collected to determine taxonomic richness.  The sampling of the 26 ponds produced 21 aquatic beetle taxa distributed in six families.  All aquatic beetles (adults and larvae) were assigned to functional feeding groups.  A canonical correspondence analysis (CCA) was run to assess relationships between aquatic beetle assemblages and environmental variables.  23% of the variance in aquatic beetle taxa abundance was accounted for by the first three ordination axes.  Moreover, the first two canonical axes accounted for 38.2% and 28.4% of the variation attributable to the environmental variables (annual precipitation, altitude, pond area, aquatic plant richness, pH and conductivity), being conductivity and altitude the most important.  A parsimony analysis was performed in order to establish which species could define and/or group some of the communities (sampling sites were treated as taxa and species were treated as characters).  The results of the parsimony analysis suggest that some taxa (Haliplus subseriatus, Gymnochthebius sp., Enochrus darwini, Cyphon sp., Luchoelmis sp.  and Rhantus validus) are useful to define some ponds or groups of ponds.  These species could be used as indicators since beetle distributions are not to be considered random.  Our findings point out that aquatic beetle assemblages could be utilised for wetlands conservation planning since in arid and semiarid Patagonia they are important as water reservoirs and also for cattle rearing.Fil: Epele, Luis Beltran. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de la Patagonia "San Juan Bosco". Facultad de Ciencias Naturales - Sede Esquel. Departamento de Biología. Laboratorio de Investigaciones en Ecología y Sistemática Animal; ArgentinaFil: Archangelsky, Miguel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de la Patagonia "San Juan Bosco". Facultad de Ciencias Naturales - Sede Esquel. Departamento de Biología. Laboratorio de Investigaciones en Ecología y Sistemática Animal; Argentin

A New Species of Water Beetle from Ischigualasto Park, Argentina (Coleoptera: Hydraenidae)

A new species of water beetle, Gymnochthebius ischigualasto, is described from IschigualastoPark, San Juan Province, Argentina. The new species is compared to relatedmembers of the genus, and the aedeagus of the holotype is illustrated. The aedeagus ofthe holotype of G. reticulatus (Orchymont), a related species, is also illustrated.Fil: Perkins, Philip D.. Harvard University; Estados UnidosFil: Archangelsky, Miguel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Universidad Nacional de La Rioja. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Universidad Nacional de Catamarca. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Secretaría de Industria y Minería. Servicio Geológico Minero Argentino. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Provincia de La Rioja. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja; Argentin