las provincias de Misiones y Buenos Aires (Argentina) y para el Estado de Minas Gerais (Brasil). ... more las provincias de Misiones y Buenos Aires (Argentina) y para el Estado de Minas Gerais (Brasil). Las observaciones aquí efectuadas podrían considerarse como registros accidentales, tratándose con certeza de aves escapadas o liberadas. A pesar de liberaciones masivas de cautiverio, esta especie aún no ha podido establecerse exitosamente en la naturaleza y su supervivencia en libertad parece ser limitada. ABSTRACT. NEW RECORDS OF BUDGERIGAR (Melopsittacus undulatus) FOR ARGENTINA AND BRAZIL. Me-lopsittacus undulatus, informaly known as the "Budgerigar" is a species original from Australia, that is currently part of the pet market. The aim of the present paper is to report new record of M. undulatus in the provinces of Misiones and Buenos Aires (Argentina) and Minas Gerais State (Brazil). Present records may be considered as of accidental occurrence, and may pertain to liberated or scaped individuals. Despite massive releases of captivity, this species has not yet been succes...
Tachymenis is a snakes genus inhabiting western South America, from coastal to Andean regions of ... more Tachymenis is a snakes genus inhabiting western South America, from coastal to Andean regions of Peru, Chile and western Bolivia and Argentina (Walker 1945; Myers and Hoogmoed 1974). The genus contains six recognized species: T. affinis Boulenger, Uetz and Etzold 1996). A seventh described species, Tachymenis surinamensis Dunn, 1922, was synonymized with Philodryas elegans (Tschudi, 1875) by Myers and Hoogmoed (1974). Tachymenis chilensis is distributed in Chile and Argentina, and is recognized to possess two subspecies (Ortiz 1973, Valenzuela-Dellarossa 2010): the northern T. c. coronellina (Werner, 1898) and the southernmost subspecies in the genus T. c. chilensis (Schlegel, 1837). This species is a small, rare, and scarcely known snake, whose distributional range required revision (Simonetti 2001). Additionally, T. chilensis was considered a Vulnerable species in Chile (Simonetti 2001; Vergara et al. 2008) and Argentina (Vidoz et al. 2011). Recently, Valenzuela-Dellarossa et al. ...
The oldest record of the genus Bothrops (Serpentes-Viperidae), from the Early to Middle Pleistoce... more The oldest record of the genus Bothrops (Serpentes-Viperidae), from the Early to Middle Pleistocene of Argentina. The genus Bothrops has 32 living species distributed in the Neotropic. However, the fossil record of this serpent restricts to a specimen of B. alternatus found in the archaeological site Cueva Tixi (Upper Pleistocene-Holocene), Buenos Aires Province. Here we add a new record of
Comprehensive studies recently published on the evolution and systematics of Phymaturus
(morpholo... more Comprehensive studies recently published on the evolution and systematics of Phymaturus (morphological and molecular ones) revealed not only a historical pattern and subclades within the traditional P. palluma and P. patagonicus species groups but also a still not fully understood unsuspected diversity. Several populations in northern and southern Argentina may represent independent lineages that deserve formal description. Two of these populations were studied for the present contribution and are easily distinguished from all the other species in the genus. One of these populations is from Río Negro province and belongs to the P. patagonicus group; it exhibits a unique dorsal color pattern and several individuals are melanic, a characteristic never reported before for the genus, with the exception of P. tenebrosus. A careful examination of melanic individuals revealed the same dorsal pattern as that of non-melanic ones, although it is obscured. We also report the discovery of melanic individuals of two other species that are probably closely related: P. ceii and P. sitesi. The melanism found in the P. patagonicus group differs from the head melanism of males in certain species of the P. palluma group because in the former group melanism is not determined by sexual dimorphism and involves the whole animal. The other population studied in this contribution belongs to the P. palluma group and is described as a new species because its color pattern and scalation differ from those of all the other members of the P. palluma group. Finally, we discuss the position of these new lizard species in the context of the available phylogenetic hypothesis and the occurrence and evolution of melanism in the P. patagonicus group.
las provincias de Misiones y Buenos Aires (Argentina) y para el Estado de Minas Gerais (Brasil). ... more las provincias de Misiones y Buenos Aires (Argentina) y para el Estado de Minas Gerais (Brasil). Las observaciones aquí efectuadas podrían considerarse como registros accidentales, tratándose con certeza de aves escapadas o liberadas. A pesar de liberaciones masivas de cautiverio, esta especie aún no ha podido establecerse exitosamente en la naturaleza y su supervivencia en libertad parece ser limitada. ABSTRACT. NEW RECORDS OF BUDGERIGAR (Melopsittacus undulatus) FOR ARGENTINA AND BRAZIL. Me-lopsittacus undulatus, informaly known as the "Budgerigar" is a species original from Australia, that is currently part of the pet market. The aim of the present paper is to report new record of M. undulatus in the provinces of Misiones and Buenos Aires (Argentina) and Minas Gerais State (Brazil). Present records may be considered as of accidental occurrence, and may pertain to liberated or scaped individuals. Despite massive releases of captivity, this species has not yet been succes...
Tachymenis is a snakes genus inhabiting western South America, from coastal to Andean regions of ... more Tachymenis is a snakes genus inhabiting western South America, from coastal to Andean regions of Peru, Chile and western Bolivia and Argentina (Walker 1945; Myers and Hoogmoed 1974). The genus contains six recognized species: T. affinis Boulenger, Uetz and Etzold 1996). A seventh described species, Tachymenis surinamensis Dunn, 1922, was synonymized with Philodryas elegans (Tschudi, 1875) by Myers and Hoogmoed (1974). Tachymenis chilensis is distributed in Chile and Argentina, and is recognized to possess two subspecies (Ortiz 1973, Valenzuela-Dellarossa 2010): the northern T. c. coronellina (Werner, 1898) and the southernmost subspecies in the genus T. c. chilensis (Schlegel, 1837). This species is a small, rare, and scarcely known snake, whose distributional range required revision (Simonetti 2001). Additionally, T. chilensis was considered a Vulnerable species in Chile (Simonetti 2001; Vergara et al. 2008) and Argentina (Vidoz et al. 2011). Recently, Valenzuela-Dellarossa et al. ...
The oldest record of the genus Bothrops (Serpentes-Viperidae), from the Early to Middle Pleistoce... more The oldest record of the genus Bothrops (Serpentes-Viperidae), from the Early to Middle Pleistocene of Argentina. The genus Bothrops has 32 living species distributed in the Neotropic. However, the fossil record of this serpent restricts to a specimen of B. alternatus found in the archaeological site Cueva Tixi (Upper Pleistocene-Holocene), Buenos Aires Province. Here we add a new record of
Comprehensive studies recently published on the evolution and systematics of Phymaturus
(morpholo... more Comprehensive studies recently published on the evolution and systematics of Phymaturus (morphological and molecular ones) revealed not only a historical pattern and subclades within the traditional P. palluma and P. patagonicus species groups but also a still not fully understood unsuspected diversity. Several populations in northern and southern Argentina may represent independent lineages that deserve formal description. Two of these populations were studied for the present contribution and are easily distinguished from all the other species in the genus. One of these populations is from Río Negro province and belongs to the P. patagonicus group; it exhibits a unique dorsal color pattern and several individuals are melanic, a characteristic never reported before for the genus, with the exception of P. tenebrosus. A careful examination of melanic individuals revealed the same dorsal pattern as that of non-melanic ones, although it is obscured. We also report the discovery of melanic individuals of two other species that are probably closely related: P. ceii and P. sitesi. The melanism found in the P. patagonicus group differs from the head melanism of males in certain species of the P. palluma group because in the former group melanism is not determined by sexual dimorphism and involves the whole animal. The other population studied in this contribution belongs to the P. palluma group and is described as a new species because its color pattern and scalation differ from those of all the other members of the P. palluma group. Finally, we discuss the position of these new lizard species in the context of the available phylogenetic hypothesis and the occurrence and evolution of melanism in the P. patagonicus group.
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(morphological and molecular ones) revealed not only a historical pattern and subclades within
the traditional P. palluma and P. patagonicus species groups but also a still not fully understood
unsuspected diversity. Several populations in northern and southern Argentina may represent
independent lineages that deserve formal description. Two of these populations were studied
for the present contribution and are easily distinguished from all the other species in the genus.
One of these populations is from Río Negro province and belongs to the P. patagonicus group;
it exhibits a unique dorsal color pattern and several individuals are melanic, a characteristic
never reported before for the genus, with the exception of P. tenebrosus. A careful examination
of melanic individuals revealed the same dorsal pattern as that of non-melanic ones, although
it is obscured. We also report the discovery of melanic individuals of two other species that are
probably closely related: P. ceii and P. sitesi. The melanism found in the P. patagonicus group
differs from the head melanism of males in certain species of the P. palluma group because in
the former group melanism is not determined by sexual dimorphism and involves the whole
animal. The other population studied in this contribution belongs to the P. palluma group and
is described as a new species because its color pattern and scalation differ from those of all the
other members of the P. palluma group. Finally, we discuss the position of these new lizard species
in the context of the available phylogenetic hypothesis and the occurrence and evolution
of melanism in the P. patagonicus group.
(morphological and molecular ones) revealed not only a historical pattern and subclades within
the traditional P. palluma and P. patagonicus species groups but also a still not fully understood
unsuspected diversity. Several populations in northern and southern Argentina may represent
independent lineages that deserve formal description. Two of these populations were studied
for the present contribution and are easily distinguished from all the other species in the genus.
One of these populations is from Río Negro province and belongs to the P. patagonicus group;
it exhibits a unique dorsal color pattern and several individuals are melanic, a characteristic
never reported before for the genus, with the exception of P. tenebrosus. A careful examination
of melanic individuals revealed the same dorsal pattern as that of non-melanic ones, although
it is obscured. We also report the discovery of melanic individuals of two other species that are
probably closely related: P. ceii and P. sitesi. The melanism found in the P. patagonicus group
differs from the head melanism of males in certain species of the P. palluma group because in
the former group melanism is not determined by sexual dimorphism and involves the whole
animal. The other population studied in this contribution belongs to the P. palluma group and
is described as a new species because its color pattern and scalation differ from those of all the
other members of the P. palluma group. Finally, we discuss the position of these new lizard species
in the context of the available phylogenetic hypothesis and the occurrence and evolution
of melanism in the P. patagonicus group.