As currently understood, the genus Nyctinomops contains four species: N. aurispinosus (Peale, 184... more As currently understood, the genus Nyctinomops contains four species: N. aurispinosus (Peale, 1849), N. femorosaccus (Merriam, 1889), N. laticaudatus (É. Geoffroy St.-Hilaire, 1805), and N. macrotis (Gray, 1840). Only N. macrotis and N. laticaudatus have been recorded from Argentina. We found that specimens of Nyctinomops captured in the province of Misiones, Argentina did not correspond to the characters of either species known from Argentina, and did not match characters of any other known species. Morphological, morphometric, and molecular analyses of these specimens revealed that they represent a new species, which we describe herein.
Breeding seasons in anurans are usually noticed by their advertisement calls, which stand as the ... more Breeding seasons in anurans are usually noticed by their advertisement calls, which stand as the main signal emitted by males during their adult life. These calls are species-specific signals with multiple information and can be used to monitor anuran populations over extended time periods. Applying a Passive Acoustic Monitoring method (PAM), we described the acoustic breeding phenology of an anuran assemblage along an altitudinal elevation range in the Yungas Andean forests of Argentina. In addition, we propose a new classification scheme for their acoustic phenological strategies, based on the male’s calling records throughout an entire year. Also, we assessed the temporal and spectral niche overlap by the anuran species recorded. The assemblage was active throughout the entire year, with a higher concentration of calls recorded during the spring-summer season. We describe five distinct Acoustic Breeding Strategies based on the calling patterns of the recorded species. Temporal ni...
The South American hoary bat, Lasiurus villosissimus (É. Geoffroy Saint-Hilaire, 1806), is a vesp... more The South American hoary bat, Lasiurus villosissimus (É. Geoffroy Saint-Hilaire, 1806), is a vespertilionid bat, endemic to South America and occurring in all countries except Guyana, French Guiana, and Suriname. It is one of the four species included in the subgenus Aeorestes. Lasiurus villosissimus is distinguishable from all other species of the genus by its larger size and coloration (except Lasiurus cinereus, but it only occurs in Mexico, Central America, and the Hawaiian Islands). Pelage is dark brownish and grayish mixed with yellow, tinged with white, producing a frosty or hoary appearance which is always evident. It is an insectivorous species that inhabits a great variety of habitats.
Ctenomys is one of the most speciose genera among South American rodents, whose systematics have ... more Ctenomys is one of the most speciose genera among South American rodents, whose systematics have not yet been fully elucidated. One of the difficulties for clarifying the identity of its species is the limited information available on some of them, erected more than a century ago and of which only the original descriptions are known, generally very poorly detailed. Our study provides new information about Ctenomys coludo Thomas 1920, based on the collection of topotype specimens that allowed us to perform more detailed morphological and molecular analyses, and to compare them with the available information referred to the holotype, with specimens deposited in museum collections, and other species of the genus that have been proposed as related to C. coludo. Our results allow us to place C. coludo as a member of the mendocinus group, proposing C. famosus Thomas, 1920 as a junior synonym for C. coludo. We also recognize Ctenomys johannis as a valid and full species, and provide unpubl...
Presentamos la experiencia de la Red Latinoamericana para la Conservación de los Murciélagos (REL... more Presentamos la experiencia de la Red Latinoamericana para la Conservación de los Murciélagos (RELCOM) y los frutos que ha cosechado. RELCOM nace 15 años, en Mérida, Yucatán, México, donde un grupo de especialistas de murciélagos y líderes en sus países, se reunieron en un congreso internacional. Hoy la RELCOM reúne a 23 Programas para la Conservación de los Murciélagos de 25 países de Latinoamérica y el Caribe. El proyecto áreas importantes para la conservación de los murciélagos (AICOMs) y sitios importantes para la conservación de los murciélagos (SICOMs) surge en 2011 y hoy cuenta con mas de 200 áreas en 21 países.
are summarized. Sixty-eight species belonging to 16 families are considered; two species are of p... more are summarized. Sixty-eight species belonging to 16 families are considered; two species are of probable occurrence (Tayassu pecari and Myrmecophaga tridactyla), and another species occurred in the province within the memories of locals living in the area (Cebus apella). A checklist also contains information on occurrence and status. Species accounts provide data on taxonomy, specimens examined and additional records, standard external and cranial morphological measurements, reproduction, molting, habitat preferences, general natural history, and other information. Geography, climate, and vegetation of the province are summarized. Mammal extirpations, potential threats to species, and mammalian conservation are discussed.
New localities are reported for 28 species of Argentine bats. One species, Vampyressa pusilia, ha... more New localities are reported for 28 species of Argentine bats. One species, Vampyressa pusilia, has a locality reported in Argentina for the first time. New provincial records are reported for seven species, including Desmodus rotundas , Histiotus macrotus, Histiotus magellanicus » Lasiurm cinereus, Lasiurus salinae, Myotis ievis, and Tadarida brasiliensis. Information on habitat associations and reproduction are given for all species, including Noctilio albiventris , Artibeus planirostris, Vampyressa pusilia, Desmodus rotundas, Eptesicus furinalis, Histiotus magellanicus, Lasiurus salinae , Lasiurus varius, Myotis albescens, Myotis chiloensis, Myotis levis, Myotis nigricans, Myotis riparius, Myotis ruber, and Tadarida brasiliensis , species for which very little information was known in Argentina, Resumbn Se presentan nuevas localidades para 28 especies de murcielagos argentinos. Se indica la local id a <1 argentina donde ha side capturado por la primera vez la e specie Vampyressa pusilia. Tambien se presentan nuevas localidades provinciates de siete especies, incluyendo Desmodus rotundas, Histiotus macrotus, Histiotus magellanicus, Lasiurus cinereus, Lasiurus salinae, Myotis levis, y Tadarida brasiliensis. Incluimos information sobre habitat y reproduction de todas las especies, incluyendo Noctilio albiventris, Artibeus planirostris, Vampyressa pusilia, Desmodus rotundus, Eptesicus furinalis, Histiotus magellanicus, Lasiurus salinae, Lasiurus varius, Myotis albescens, Myotis chiloensis, Myotis levis, Myotis nigricans, Myotis riparius, Myotis ruber, y Tadarida brasiliensis, especies que carecian de m uch a information en la argentina. 220 Annals of Carnegie Museum vol. 64 new information has been published regarding Argentine bats (Barquez, 1988; Barquez and Lougheed, 1 990), including a monograph on the bats of the Argentine chaco (Barquez and Ojeda, 1992), and a bilingual field guide to the bats of Argentina (Barquez et al., 1993). Although each of these has added to our knowledge of the chiropteran fauna of Argentina, the country's bat fauna still cannot be considered well known. In this paper we present additional information on the distribution, ecology, reproduction, and habitat selection of 28 species of bats collected during four years of faunal survey research in Argentina (1990-94). Methods This study was based on 349 specimens collected between 1990 and 1994. All specimens examined are preserved as skin, skull, and skeleton, or in alcohol, and are deposited in the following museums (acronyms given in parentheses
An annotated checklist of the species of bats occurring in the Argentine Chaco is provided, as we... more An annotated checklist of the species of bats occurring in the Argentine Chaco is provided, as well as an analysis of their distribution in three clearly differentiated areas: the Western, the Eastern, and the Central Chaco. The Western and Eastern Chaco have the largest number of species with 3 1 each, while the Central Chaco has only 14 species. This difference in richness is related to contact of the Chaco with humid and transitional habitats adjacent to the western and eastern subregions. We also give a comparison with the bat faunas of the Chaco of Paraguay and Bolivia, as well as general comments about taxonomy, feeding guilds, abundance, and reproduction. Resumen En este trabajo se ofrece la lista de especies que habitan el Chaco argentine, analizada desde un punto de vista biogeografico, en el contexto de tres regiones claramente definidas: Occidental, Central y Oriental. Asimismo, se presenta una comparacion con las areas chaquenas de Paraguay y Bolivia. Actualmente el Chaco argentino contiene 43 especies de murcielagos, lo que representa un 86% de las especies que habitan todo el ecosistema. Las porciones oriental y occidental soportan cada una un total de 31 especies mientras que solo 14 se encuentran en la region central. Este patron de riqueza de especies tiene estrecha relacion con los bosques humedos del este y del oeste. Se mencionan, ademas, los gremios alimenticios y la abundancia relativa de todas las especies y comentarios taxonomicos y
Chromosomal and morphometric studies were conducted on a sample from an assemblage of Akodon spp.... more Chromosomal and morphometric studies were conducted on a sample from an assemblage of Akodon spp. occurring in various patterns of sympatry from the provinces of Catamarca, Jujuy, Salta, and Tucuman, Argentina. Results showed three distinct morphometric groups based upon size. Size also varied with age, but there were no significant differences in measurements of males and females. The three morphometric groups have distinct karyotypes. Akodon caenosus Thomas is the smallest of the three, and has a karyotype of 2n = 34, FN-40. A, boliviensis tucumanensis J. A. Allen is intermediate in size and has 2e = 40, FN = 40, 41. Three variations in centromeric position of the X chromosomes and two autosome arm numbers were found. A. varius simulator
In this research we explore elevation gradient of small mammal diversity on the arid slopes of th... more In this research we explore elevation gradient of small mammal diversity on the arid slopes of the Andes in northwestern Argentina. We evaluated the influence of climatic and environmental factors on species richness and abundance across two altitudinal transects between 2700 and 4700 m. We used canonical correspondence analysis, multiple regressions (GLM’s), and variation partitioning analysis to evaluate the primary productivity, environmental heterogeneity, and climate as drivers of species diversity. The general trend indicates a greater diversity towards high elevation with an abrupt decrease towards the summit. The most remarkable pattern was the coincident distribution of the maximum values for both, abundance and richness at the same altitude (3700 m). The species richness showed a flattened distribution with the maximum values between 3200 and 3700 m and a small peak at 4200 m. We found that the joint effects of environmental heterogeneity with productivity explained most of the variation for richness and abundance (86.5%, 63.2% respectively). These results highlight the complexity of the mountain environments in desert areas while emphasizing the importance of these habitats for the maintenance of biological diversity. Our results constitute an important tool for the conservation of small mammals diversity in these mountain arid environments.
Information about the ectoparasite insects of six species of argentino bats, one Vespertilionidae... more Information about the ectoparasite insects of six species of argentino bats, one Vespertilionidae, one Molossidae and four Phyllostomidae is offered. Trichobius dunni is added to the fauna of Argentina as well as new localities to the previously known distribution for Anatrichcbíus scorzai, Megistopoda próxima, and Trichobius parasiticus.
A new material of a Quaternary waterfowl is described here. The implications of this finding, in ... more A new material of a Quaternary waterfowl is described here. The implications of this finding, in the context of the dispersal of Anatidae in the past, are discussed. The specimen consists in a partial humerus coming from the Upper Pleistocene of austral Chaco from Santiago del Estero Province, Argentina. The specimen here described belongs to the tribe Cygnini, being larger than most members of the clade. The humerus shows different size than with other members of the tribe Cygnini, being larger than the humeri referred to the Andean goose (Oressochen melanopterus), the Sheldgeese of the genus Chloephaga, the Comb Duck (Sarkidiornis sylvicola), and larger than the Ruddy Shelduck (Tadorna ferruginea). However, the humerus have several anatomical characters indicating that it belongs to a basal anserine duck. These combinations of features allow us to assign this fossil to a species of waterfowl: Coscoroba coscoroba. This finding, it context with the history of the South American Cygn...
Additional file 1. Examined specimens of the species included in this study. Specimens are indivi... more Additional file 1. Examined specimens of the species included in this study. Specimens are individualized by the acronym of the collection or collector and the corresponding number in the collection or collector catalog. CML is the Spanish acronym of the Lillo Mammal Collection -CML- (Natural Sciences Faculty and Miguel Lillo Institute, National University of Tucuman, Argentina), and LIF and LT-RMB are collector acronyms. Specimens are arranged according to their sample antiquity, geographical origin (political province), collection season, and sex.
Chromosomal and morphometric studies were conducted on a sample from an assemblage of Akodon spp.... more Chromosomal and morphometric studies were conducted on a sample from an assemblage of Akodon spp. occurring in various patterns of sympatry from the provinces of Catamarca, Jujuy, Salta, and Tucuman, Argentina. Results showed three distinct morphometric groups based upon size. Size also varied with age, but there were no significant differences in measurements of males and females. The three morphometric groups have distinct karyotypes. Akodon caenosus Thomas is the smallest of the three, and has a karyotype of 2n = 34, FN = 40. A. boliviensis tucumanensis J. A. Allen is intermediate in size and has 2n = 40, FN = 40,41. Three variations in centromeric position of the X chromosomes and two autosome arm numbers were found. A. varius simulator 1 Direccion Nacional de Fauna Silvestre, Argentina. 2 Department of Biological Sciences, California State College, Stanislaus, Turlock, California 95380. 3 Department of Biological Sciences, Univ. Pittsburgh, Pittsburgh, Pennsylvania 15260; and P...
As currently understood, the genus Nyctinomops contains four species: N. aurispinosus (Peale, 184... more As currently understood, the genus Nyctinomops contains four species: N. aurispinosus (Peale, 1849), N. femorosaccus (Merriam, 1889), N. laticaudatus (É. Geoffroy St.-Hilaire, 1805), and N. macrotis (Gray, 1840). Only N. macrotis and N. laticaudatus have been recorded from Argentina. We found that specimens of Nyctinomops captured in the province of Misiones, Argentina did not correspond to the characters of either species known from Argentina, and did not match characters of any other known species. Morphological, morphometric, and molecular analyses of these specimens revealed that they represent a new species, which we describe herein.
Breeding seasons in anurans are usually noticed by their advertisement calls, which stand as the ... more Breeding seasons in anurans are usually noticed by their advertisement calls, which stand as the main signal emitted by males during their adult life. These calls are species-specific signals with multiple information and can be used to monitor anuran populations over extended time periods. Applying a Passive Acoustic Monitoring method (PAM), we described the acoustic breeding phenology of an anuran assemblage along an altitudinal elevation range in the Yungas Andean forests of Argentina. In addition, we propose a new classification scheme for their acoustic phenological strategies, based on the male’s calling records throughout an entire year. Also, we assessed the temporal and spectral niche overlap by the anuran species recorded. The assemblage was active throughout the entire year, with a higher concentration of calls recorded during the spring-summer season. We describe five distinct Acoustic Breeding Strategies based on the calling patterns of the recorded species. Temporal ni...
The South American hoary bat, Lasiurus villosissimus (É. Geoffroy Saint-Hilaire, 1806), is a vesp... more The South American hoary bat, Lasiurus villosissimus (É. Geoffroy Saint-Hilaire, 1806), is a vespertilionid bat, endemic to South America and occurring in all countries except Guyana, French Guiana, and Suriname. It is one of the four species included in the subgenus Aeorestes. Lasiurus villosissimus is distinguishable from all other species of the genus by its larger size and coloration (except Lasiurus cinereus, but it only occurs in Mexico, Central America, and the Hawaiian Islands). Pelage is dark brownish and grayish mixed with yellow, tinged with white, producing a frosty or hoary appearance which is always evident. It is an insectivorous species that inhabits a great variety of habitats.
Ctenomys is one of the most speciose genera among South American rodents, whose systematics have ... more Ctenomys is one of the most speciose genera among South American rodents, whose systematics have not yet been fully elucidated. One of the difficulties for clarifying the identity of its species is the limited information available on some of them, erected more than a century ago and of which only the original descriptions are known, generally very poorly detailed. Our study provides new information about Ctenomys coludo Thomas 1920, based on the collection of topotype specimens that allowed us to perform more detailed morphological and molecular analyses, and to compare them with the available information referred to the holotype, with specimens deposited in museum collections, and other species of the genus that have been proposed as related to C. coludo. Our results allow us to place C. coludo as a member of the mendocinus group, proposing C. famosus Thomas, 1920 as a junior synonym for C. coludo. We also recognize Ctenomys johannis as a valid and full species, and provide unpubl...
Presentamos la experiencia de la Red Latinoamericana para la Conservación de los Murciélagos (REL... more Presentamos la experiencia de la Red Latinoamericana para la Conservación de los Murciélagos (RELCOM) y los frutos que ha cosechado. RELCOM nace 15 años, en Mérida, Yucatán, México, donde un grupo de especialistas de murciélagos y líderes en sus países, se reunieron en un congreso internacional. Hoy la RELCOM reúne a 23 Programas para la Conservación de los Murciélagos de 25 países de Latinoamérica y el Caribe. El proyecto áreas importantes para la conservación de los murciélagos (AICOMs) y sitios importantes para la conservación de los murciélagos (SICOMs) surge en 2011 y hoy cuenta con mas de 200 áreas en 21 países.
are summarized. Sixty-eight species belonging to 16 families are considered; two species are of p... more are summarized. Sixty-eight species belonging to 16 families are considered; two species are of probable occurrence (Tayassu pecari and Myrmecophaga tridactyla), and another species occurred in the province within the memories of locals living in the area (Cebus apella). A checklist also contains information on occurrence and status. Species accounts provide data on taxonomy, specimens examined and additional records, standard external and cranial morphological measurements, reproduction, molting, habitat preferences, general natural history, and other information. Geography, climate, and vegetation of the province are summarized. Mammal extirpations, potential threats to species, and mammalian conservation are discussed.
New localities are reported for 28 species of Argentine bats. One species, Vampyressa pusilia, ha... more New localities are reported for 28 species of Argentine bats. One species, Vampyressa pusilia, has a locality reported in Argentina for the first time. New provincial records are reported for seven species, including Desmodus rotundas , Histiotus macrotus, Histiotus magellanicus » Lasiurm cinereus, Lasiurus salinae, Myotis ievis, and Tadarida brasiliensis. Information on habitat associations and reproduction are given for all species, including Noctilio albiventris , Artibeus planirostris, Vampyressa pusilia, Desmodus rotundas, Eptesicus furinalis, Histiotus magellanicus, Lasiurus salinae , Lasiurus varius, Myotis albescens, Myotis chiloensis, Myotis levis, Myotis nigricans, Myotis riparius, Myotis ruber, and Tadarida brasiliensis , species for which very little information was known in Argentina, Resumbn Se presentan nuevas localidades para 28 especies de murcielagos argentinos. Se indica la local id a <1 argentina donde ha side capturado por la primera vez la e specie Vampyressa pusilia. Tambien se presentan nuevas localidades provinciates de siete especies, incluyendo Desmodus rotundas, Histiotus macrotus, Histiotus magellanicus, Lasiurus cinereus, Lasiurus salinae, Myotis levis, y Tadarida brasiliensis. Incluimos information sobre habitat y reproduction de todas las especies, incluyendo Noctilio albiventris, Artibeus planirostris, Vampyressa pusilia, Desmodus rotundus, Eptesicus furinalis, Histiotus magellanicus, Lasiurus salinae, Lasiurus varius, Myotis albescens, Myotis chiloensis, Myotis levis, Myotis nigricans, Myotis riparius, Myotis ruber, y Tadarida brasiliensis, especies que carecian de m uch a information en la argentina. 220 Annals of Carnegie Museum vol. 64 new information has been published regarding Argentine bats (Barquez, 1988; Barquez and Lougheed, 1 990), including a monograph on the bats of the Argentine chaco (Barquez and Ojeda, 1992), and a bilingual field guide to the bats of Argentina (Barquez et al., 1993). Although each of these has added to our knowledge of the chiropteran fauna of Argentina, the country's bat fauna still cannot be considered well known. In this paper we present additional information on the distribution, ecology, reproduction, and habitat selection of 28 species of bats collected during four years of faunal survey research in Argentina (1990-94). Methods This study was based on 349 specimens collected between 1990 and 1994. All specimens examined are preserved as skin, skull, and skeleton, or in alcohol, and are deposited in the following museums (acronyms given in parentheses
An annotated checklist of the species of bats occurring in the Argentine Chaco is provided, as we... more An annotated checklist of the species of bats occurring in the Argentine Chaco is provided, as well as an analysis of their distribution in three clearly differentiated areas: the Western, the Eastern, and the Central Chaco. The Western and Eastern Chaco have the largest number of species with 3 1 each, while the Central Chaco has only 14 species. This difference in richness is related to contact of the Chaco with humid and transitional habitats adjacent to the western and eastern subregions. We also give a comparison with the bat faunas of the Chaco of Paraguay and Bolivia, as well as general comments about taxonomy, feeding guilds, abundance, and reproduction. Resumen En este trabajo se ofrece la lista de especies que habitan el Chaco argentine, analizada desde un punto de vista biogeografico, en el contexto de tres regiones claramente definidas: Occidental, Central y Oriental. Asimismo, se presenta una comparacion con las areas chaquenas de Paraguay y Bolivia. Actualmente el Chaco argentino contiene 43 especies de murcielagos, lo que representa un 86% de las especies que habitan todo el ecosistema. Las porciones oriental y occidental soportan cada una un total de 31 especies mientras que solo 14 se encuentran en la region central. Este patron de riqueza de especies tiene estrecha relacion con los bosques humedos del este y del oeste. Se mencionan, ademas, los gremios alimenticios y la abundancia relativa de todas las especies y comentarios taxonomicos y
Chromosomal and morphometric studies were conducted on a sample from an assemblage of Akodon spp.... more Chromosomal and morphometric studies were conducted on a sample from an assemblage of Akodon spp. occurring in various patterns of sympatry from the provinces of Catamarca, Jujuy, Salta, and Tucuman, Argentina. Results showed three distinct morphometric groups based upon size. Size also varied with age, but there were no significant differences in measurements of males and females. The three morphometric groups have distinct karyotypes. Akodon caenosus Thomas is the smallest of the three, and has a karyotype of 2n = 34, FN-40. A, boliviensis tucumanensis J. A. Allen is intermediate in size and has 2e = 40, FN = 40, 41. Three variations in centromeric position of the X chromosomes and two autosome arm numbers were found. A. varius simulator
In this research we explore elevation gradient of small mammal diversity on the arid slopes of th... more In this research we explore elevation gradient of small mammal diversity on the arid slopes of the Andes in northwestern Argentina. We evaluated the influence of climatic and environmental factors on species richness and abundance across two altitudinal transects between 2700 and 4700 m. We used canonical correspondence analysis, multiple regressions (GLM’s), and variation partitioning analysis to evaluate the primary productivity, environmental heterogeneity, and climate as drivers of species diversity. The general trend indicates a greater diversity towards high elevation with an abrupt decrease towards the summit. The most remarkable pattern was the coincident distribution of the maximum values for both, abundance and richness at the same altitude (3700 m). The species richness showed a flattened distribution with the maximum values between 3200 and 3700 m and a small peak at 4200 m. We found that the joint effects of environmental heterogeneity with productivity explained most of the variation for richness and abundance (86.5%, 63.2% respectively). These results highlight the complexity of the mountain environments in desert areas while emphasizing the importance of these habitats for the maintenance of biological diversity. Our results constitute an important tool for the conservation of small mammals diversity in these mountain arid environments.
Information about the ectoparasite insects of six species of argentino bats, one Vespertilionidae... more Information about the ectoparasite insects of six species of argentino bats, one Vespertilionidae, one Molossidae and four Phyllostomidae is offered. Trichobius dunni is added to the fauna of Argentina as well as new localities to the previously known distribution for Anatrichcbíus scorzai, Megistopoda próxima, and Trichobius parasiticus.
A new material of a Quaternary waterfowl is described here. The implications of this finding, in ... more A new material of a Quaternary waterfowl is described here. The implications of this finding, in the context of the dispersal of Anatidae in the past, are discussed. The specimen consists in a partial humerus coming from the Upper Pleistocene of austral Chaco from Santiago del Estero Province, Argentina. The specimen here described belongs to the tribe Cygnini, being larger than most members of the clade. The humerus shows different size than with other members of the tribe Cygnini, being larger than the humeri referred to the Andean goose (Oressochen melanopterus), the Sheldgeese of the genus Chloephaga, the Comb Duck (Sarkidiornis sylvicola), and larger than the Ruddy Shelduck (Tadorna ferruginea). However, the humerus have several anatomical characters indicating that it belongs to a basal anserine duck. These combinations of features allow us to assign this fossil to a species of waterfowl: Coscoroba coscoroba. This finding, it context with the history of the South American Cygn...
Additional file 1. Examined specimens of the species included in this study. Specimens are indivi... more Additional file 1. Examined specimens of the species included in this study. Specimens are individualized by the acronym of the collection or collector and the corresponding number in the collection or collector catalog. CML is the Spanish acronym of the Lillo Mammal Collection -CML- (Natural Sciences Faculty and Miguel Lillo Institute, National University of Tucuman, Argentina), and LIF and LT-RMB are collector acronyms. Specimens are arranged according to their sample antiquity, geographical origin (political province), collection season, and sex.
Chromosomal and morphometric studies were conducted on a sample from an assemblage of Akodon spp.... more Chromosomal and morphometric studies were conducted on a sample from an assemblage of Akodon spp. occurring in various patterns of sympatry from the provinces of Catamarca, Jujuy, Salta, and Tucuman, Argentina. Results showed three distinct morphometric groups based upon size. Size also varied with age, but there were no significant differences in measurements of males and females. The three morphometric groups have distinct karyotypes. Akodon caenosus Thomas is the smallest of the three, and has a karyotype of 2n = 34, FN = 40. A. boliviensis tucumanensis J. A. Allen is intermediate in size and has 2n = 40, FN = 40,41. Three variations in centromeric position of the X chromosomes and two autosome arm numbers were found. A. varius simulator 1 Direccion Nacional de Fauna Silvestre, Argentina. 2 Department of Biological Sciences, California State College, Stanislaus, Turlock, California 95380. 3 Department of Biological Sciences, Univ. Pittsburgh, Pittsburgh, Pennsylvania 15260; and P...
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