marisol montellano | Universidad Nacional Autónoma de México (original) (raw)
Papers by marisol montellano
Se presenta un panorama sobre las primeras menciones a propósito de los vestigios de vida en el p... more Se presenta un panorama sobre las primeras menciones a propósito de los vestigios de vida en el pasado encontrados en el suelo y subsuelo de lo que hoy día constituye la República Mexicana, así como la historia -contada a grandes pasos-del desarrollo de la Paleontología en México.
Revista Mexicana de Ciencias Geológicas
Se presenta un panorama sobre las primeras menciones a propósito de los vestigios de vida en el p... more Se presenta un panorama sobre las primeras menciones a propósito de los vestigios de vida en el pasado encontrados en el suelo y subsuelo de lo que hoy día constituye la República Mexicana, así como la historia -contada a grandes pasos-del desarrollo de la Paleontología en México.
Revista Mexicana de Ciencias Geológicas
In Mexico, the theropods represents a poorly known group of dinosaurs, the scarce material had be... more In Mexico, the theropods represents a poorly known group of dinosaurs, the scarce material had been referred only to �family� level. As a result of paleontological research carried on in the State of Coahuila, dental remains belonging to theropods were recovered. The identified genera are Saurornitholestes, cf. Troodon, as well as Tyrannosauridae and an indeterminate theropod. The theropod diversity of Coahuila is similar to that described for the Big Bend National Park, Texas, confirming the existence of a distinct dinosaurian biogeographic province in the southern Great Plains of North America. If the presence of Troodon at this latitude is confirmed, it would suggest that the geographic distribution of this theropod genus was much wider than previously supposed. En México, los terópodos son un grupo de dinosaurios poco conocido, el escaso material descrito ha sido referido solamente a nivel de �familia�. Como resultado de la investigación paleontológica realizada en el Estado de ...
Revista Mexicana de Ciencias Geológicas
Restos de un saurópodo titanosaúrido fueron descubiertos en la zona de Altares, en el noreste del... more Restos de un saurópodo titanosaúrido fueron descubiertos en la zona de Altares, en el noreste del Estado de Chihuahua, México. El material fósil proviene de rocas que han sido correlacionadas ya sea con la parte continental más superior de la Formación Aguja o la parte continental más inferior de la Formación Javelina. El material incluye los cuerpos de cuatro vértebras caudales posteriores y son identificados como pertenecientes a la familia Titanosauridae con base en la condición fuertemente procélica. Este es el primer registro de la familia para el país.
En el Municipio de Villaflores, estado de Chiapas, fueron encontradas astas de cérvidos en sedime... more En el Municipio de Villaflores, estado de Chiapas, fueron encontradas astas de cérvidos en sedimentos pleistocénicos. Después de compararlas con material reciente de las dos especies de Odocoileus presentes en México, el material es equiparable por su esbeltez al venado de cola blanca por lo que estas astas se asignan a Odocoileus cf. O. virginianus.
Boletin de la Sociedad Geologica Mexicana
A Starting in the XVIII century European naturalists arrived in Ecuador on scientific expeditions... more A Starting in the XVIII century European naturalists arrived in Ecuador on scientific expeditions; during their trips they collected samples of plants, animals, rocks and fossils. Humboldt and Darwin stand out among other dignitaries. At the beginning of the XX century, Franz Spillmann traveled throughout the country and assembled a collection of fossils that made up the "Gabinete de Ciencias Naturales" of the Universidad Central. Later, in 1946, Robert Hoffstetter arrived and along with Gustavo Orcés founded the Department of Biology at the Escuela Politécnica Nacional. During his stay in the country, Hoffstteter carried out several paleontological expeditions, mainly in the Santa Elena Peninsula. He put together and catalogued all the fossil material housed at the "Gabinete de Ciencias Naturales" of the Universidad Central and the material he collected on his expeditions. After his departure, in 1952, and until the arrival of the Italian Scientific Mission in t...
Canadian Journal of Earth Sciences, 2015
A new tribotherian mammal, Tirotherium aptum gen. et sp. nov., is described from the late Santoni... more A new tribotherian mammal, Tirotherium aptum gen. et sp. nov., is described from the late Santonian to early Campanian upper Milk River Formation of Verdigris Coulee, southern Alberta, Canada. The new mammal is known only from isolated teeth, five upper and three lower molars. The upper molars represent two or possibly three pre-ultimate loci and are marked by reduction and loss of the stylar shelf anteriorly, loss of the stylocone, a paracone that is larger than the metacone, weakly developed conules, a low, small protocone, and specialized postvallum single-rank shear. The lower molars probably represent two pre-ultimate loci and are characterized by an anteriorly positioned paraconid, trenchant paracristid, small, posterolingual metaconid, a distal metacristid, broadly open trigonid angle, and a short, basined talonid in which the hypoconulid is closer to the entoconid than to the hypoconid. The molars of Tirotherium most closely resemble those of Picopsis Fox, 1980, a tribotherian that also occurs in the upper Milk River Formation, but the molars of Tirotherium are significantly larger than those of Picopsis. Nonetheless, Tirotherium aptum is best classified in the Picopsidae, a boreosphenidan family of tiny mammalian faunivores of uncertain relationships to other tribotherians, and displaying a unique mosaic of primitive and derived characters.
Topics in Geobiology, 2006
Special Paper 393: The Mojave-Sonora Megashear Hypothesis: Development, Assessment, and Alternatives, 2005
... Late Jurassic, fossil-bearing volcanic and sedimentary red beds of Huizachal Canyon, Tamaulip... more ... Late Jurassic, fossil-bearing volcanic and sedimentary red beds of Huizachal Canyon, Tamaulipas, Mexico David E. Fastovsky O. Don Hermes Nicholas H. Strater Department of Geosciences, University of Rhode Island, Kingston, Rhode Island 02881, USA Samuel A. Bowring ...
Tayassuidae is represented by three extant species whose distribution ranges from southwestern U... more Tayassuidae is represented by three extant species whose distribution ranges from southwestern United States to north-central Argentina. As one of the North American immigrants that entered South America during the Great American Biotic Interchange, the oldest unquestionable record of the family dates to the middle Pliocene in Argentina. Intensive paleontological fieldwork carried out in Venezuela resulted in many new localities containing vertebrate fossils remains. Among these sites, the fossil-rich tar pits and caves are particularly signifi cant. Dental remains of Tayassu pecari discovered in these sites are smaller than those described from other regions. The presence of Tayassu pecari in the ?late Pliocene Venezuelan locality represents the putative oldest record of this species in South America. A few specimens were identifi ed as Pecari tajacu. The Venezuelan tayassuid fossils document the presence of these two distinct North American immigrant lineages in northern South America, and provide information that improves our understanding of the distribution and diversity of the group in South America during the late Pliocene-early Holocene, following their entry into South American during the Great American Biotic Interchange
The Southwestern Naturalist, 2009
A well-preserved right lower jaw with complete P 3 -M 1 and an isolated canine of a large felid w... more A well-preserved right lower jaw with complete P 3 -M 1 and an isolated canine of a large felid was found in the southern state of Chiapas, Mexico. It is identified as the American lion Panthera leo atrox. Its presence in Chiapas documents its southernmost distribution in North America.
Journal of Vertebrate Paleontology, 2008
Journal of Vertebrate Paleontology, 2004
The new giant turtle species Gopherus donlaloi is described from a partial skeleton with skull co... more The new giant turtle species Gopherus donlaloi is described from a partial skeleton with skull collected in the Rancholabrean deposits in northeastern Mé xico. The skull resembles the skull of extant turtles G. polyphemus and G. flavomarginatus but the new species shows unique skull and shell features. Shell meristic variation of the new species, G. berlandieri, and G. laticuneus is discussed denoting problems in the assessment of species based on extremely variable shell characters. Lack of diagnostic features in shells of G. edae and G. hexagonatus suggests their status as nomina vana. A cladistic strict consensus tree suggests that Gopherus is a monophyletic group where G. mohavetus falls within the outgroup, questioning its status as a member of Gopherus. Oligocene G. laticuneus is sister to all Gopherus, after which Recent G. berlandieri and G. agassizii branched out paraphyletically. Gopherus sensu stricto is monophyletic but the relationships among its taxa are unknown; these include the Miocene G. brevisternus, G. pansus, and G. vagus, the Plio-Pleistocene G. canyonensis and G. donlaloi, and the Recent G. polyphemus and G. flavomarginatus. A second analysis excluding most incomplete taxa retains the polytomy of G. berlandieri, G. agassizii, and Gopherus sensu stricto, but resolves the relationships within Gopherus sensu stricto. G. brevisternus is sister to the rest of the clade, followed by G. flavomarginatus, after which there is a polytomy formed by G. canyonensis, G. donlaloi and G. polyphemus. Bootstrap and branch-support analyses indicate that the clades within Gopherus sensu stricto are well supported. Reanalysis of biogeographic relationships based on the phylogeny suggests that the origin of Gopherus sensu stricto can be traced to the Miocene on the Central Plains, later extending southward from eastern Arizona to Florida and from northern Texas to Aguascalientes during the Plio-Pleistocene. The extinction of giant gopher turtles in Texas and eastern Mexico associated with the invasion of their distribution area by G. berlandieri is the best hypothesis to explain the recent disjunct distribution of G. polyphemus and G. flavomarginatus.
Se presenta un panorama sobre las primeras menciones a propósito de los vestigios de vida en el p... more Se presenta un panorama sobre las primeras menciones a propósito de los vestigios de vida en el pasado encontrados en el suelo y subsuelo de lo que hoy día constituye la República Mexicana, así como la historia -contada a grandes pasos-del desarrollo de la Paleontología en México.
Revista Mexicana de Ciencias Geológicas
Se presenta un panorama sobre las primeras menciones a propósito de los vestigios de vida en el p... more Se presenta un panorama sobre las primeras menciones a propósito de los vestigios de vida en el pasado encontrados en el suelo y subsuelo de lo que hoy día constituye la República Mexicana, así como la historia -contada a grandes pasos-del desarrollo de la Paleontología en México.
Revista Mexicana de Ciencias Geológicas
In Mexico, the theropods represents a poorly known group of dinosaurs, the scarce material had be... more In Mexico, the theropods represents a poorly known group of dinosaurs, the scarce material had been referred only to �family� level. As a result of paleontological research carried on in the State of Coahuila, dental remains belonging to theropods were recovered. The identified genera are Saurornitholestes, cf. Troodon, as well as Tyrannosauridae and an indeterminate theropod. The theropod diversity of Coahuila is similar to that described for the Big Bend National Park, Texas, confirming the existence of a distinct dinosaurian biogeographic province in the southern Great Plains of North America. If the presence of Troodon at this latitude is confirmed, it would suggest that the geographic distribution of this theropod genus was much wider than previously supposed. En México, los terópodos son un grupo de dinosaurios poco conocido, el escaso material descrito ha sido referido solamente a nivel de �familia�. Como resultado de la investigación paleontológica realizada en el Estado de ...
Revista Mexicana de Ciencias Geológicas
Restos de un saurópodo titanosaúrido fueron descubiertos en la zona de Altares, en el noreste del... more Restos de un saurópodo titanosaúrido fueron descubiertos en la zona de Altares, en el noreste del Estado de Chihuahua, México. El material fósil proviene de rocas que han sido correlacionadas ya sea con la parte continental más superior de la Formación Aguja o la parte continental más inferior de la Formación Javelina. El material incluye los cuerpos de cuatro vértebras caudales posteriores y son identificados como pertenecientes a la familia Titanosauridae con base en la condición fuertemente procélica. Este es el primer registro de la familia para el país.
En el Municipio de Villaflores, estado de Chiapas, fueron encontradas astas de cérvidos en sedime... more En el Municipio de Villaflores, estado de Chiapas, fueron encontradas astas de cérvidos en sedimentos pleistocénicos. Después de compararlas con material reciente de las dos especies de Odocoileus presentes en México, el material es equiparable por su esbeltez al venado de cola blanca por lo que estas astas se asignan a Odocoileus cf. O. virginianus.
Boletin de la Sociedad Geologica Mexicana
A Starting in the XVIII century European naturalists arrived in Ecuador on scientific expeditions... more A Starting in the XVIII century European naturalists arrived in Ecuador on scientific expeditions; during their trips they collected samples of plants, animals, rocks and fossils. Humboldt and Darwin stand out among other dignitaries. At the beginning of the XX century, Franz Spillmann traveled throughout the country and assembled a collection of fossils that made up the "Gabinete de Ciencias Naturales" of the Universidad Central. Later, in 1946, Robert Hoffstetter arrived and along with Gustavo Orcés founded the Department of Biology at the Escuela Politécnica Nacional. During his stay in the country, Hoffstteter carried out several paleontological expeditions, mainly in the Santa Elena Peninsula. He put together and catalogued all the fossil material housed at the "Gabinete de Ciencias Naturales" of the Universidad Central and the material he collected on his expeditions. After his departure, in 1952, and until the arrival of the Italian Scientific Mission in t...
Canadian Journal of Earth Sciences, 2015
A new tribotherian mammal, Tirotherium aptum gen. et sp. nov., is described from the late Santoni... more A new tribotherian mammal, Tirotherium aptum gen. et sp. nov., is described from the late Santonian to early Campanian upper Milk River Formation of Verdigris Coulee, southern Alberta, Canada. The new mammal is known only from isolated teeth, five upper and three lower molars. The upper molars represent two or possibly three pre-ultimate loci and are marked by reduction and loss of the stylar shelf anteriorly, loss of the stylocone, a paracone that is larger than the metacone, weakly developed conules, a low, small protocone, and specialized postvallum single-rank shear. The lower molars probably represent two pre-ultimate loci and are characterized by an anteriorly positioned paraconid, trenchant paracristid, small, posterolingual metaconid, a distal metacristid, broadly open trigonid angle, and a short, basined talonid in which the hypoconulid is closer to the entoconid than to the hypoconid. The molars of Tirotherium most closely resemble those of Picopsis Fox, 1980, a tribotherian that also occurs in the upper Milk River Formation, but the molars of Tirotherium are significantly larger than those of Picopsis. Nonetheless, Tirotherium aptum is best classified in the Picopsidae, a boreosphenidan family of tiny mammalian faunivores of uncertain relationships to other tribotherians, and displaying a unique mosaic of primitive and derived characters.
Topics in Geobiology, 2006
Special Paper 393: The Mojave-Sonora Megashear Hypothesis: Development, Assessment, and Alternatives, 2005
... Late Jurassic, fossil-bearing volcanic and sedimentary red beds of Huizachal Canyon, Tamaulip... more ... Late Jurassic, fossil-bearing volcanic and sedimentary red beds of Huizachal Canyon, Tamaulipas, Mexico David E. Fastovsky O. Don Hermes Nicholas H. Strater Department of Geosciences, University of Rhode Island, Kingston, Rhode Island 02881, USA Samuel A. Bowring ...
Tayassuidae is represented by three extant species whose distribution ranges from southwestern U... more Tayassuidae is represented by three extant species whose distribution ranges from southwestern United States to north-central Argentina. As one of the North American immigrants that entered South America during the Great American Biotic Interchange, the oldest unquestionable record of the family dates to the middle Pliocene in Argentina. Intensive paleontological fieldwork carried out in Venezuela resulted in many new localities containing vertebrate fossils remains. Among these sites, the fossil-rich tar pits and caves are particularly signifi cant. Dental remains of Tayassu pecari discovered in these sites are smaller than those described from other regions. The presence of Tayassu pecari in the ?late Pliocene Venezuelan locality represents the putative oldest record of this species in South America. A few specimens were identifi ed as Pecari tajacu. The Venezuelan tayassuid fossils document the presence of these two distinct North American immigrant lineages in northern South America, and provide information that improves our understanding of the distribution and diversity of the group in South America during the late Pliocene-early Holocene, following their entry into South American during the Great American Biotic Interchange
The Southwestern Naturalist, 2009
A well-preserved right lower jaw with complete P 3 -M 1 and an isolated canine of a large felid w... more A well-preserved right lower jaw with complete P 3 -M 1 and an isolated canine of a large felid was found in the southern state of Chiapas, Mexico. It is identified as the American lion Panthera leo atrox. Its presence in Chiapas documents its southernmost distribution in North America.
Journal of Vertebrate Paleontology, 2008
Journal of Vertebrate Paleontology, 2004
The new giant turtle species Gopherus donlaloi is described from a partial skeleton with skull co... more The new giant turtle species Gopherus donlaloi is described from a partial skeleton with skull collected in the Rancholabrean deposits in northeastern Mé xico. The skull resembles the skull of extant turtles G. polyphemus and G. flavomarginatus but the new species shows unique skull and shell features. Shell meristic variation of the new species, G. berlandieri, and G. laticuneus is discussed denoting problems in the assessment of species based on extremely variable shell characters. Lack of diagnostic features in shells of G. edae and G. hexagonatus suggests their status as nomina vana. A cladistic strict consensus tree suggests that Gopherus is a monophyletic group where G. mohavetus falls within the outgroup, questioning its status as a member of Gopherus. Oligocene G. laticuneus is sister to all Gopherus, after which Recent G. berlandieri and G. agassizii branched out paraphyletically. Gopherus sensu stricto is monophyletic but the relationships among its taxa are unknown; these include the Miocene G. brevisternus, G. pansus, and G. vagus, the Plio-Pleistocene G. canyonensis and G. donlaloi, and the Recent G. polyphemus and G. flavomarginatus. A second analysis excluding most incomplete taxa retains the polytomy of G. berlandieri, G. agassizii, and Gopherus sensu stricto, but resolves the relationships within Gopherus sensu stricto. G. brevisternus is sister to the rest of the clade, followed by G. flavomarginatus, after which there is a polytomy formed by G. canyonensis, G. donlaloi and G. polyphemus. Bootstrap and branch-support analyses indicate that the clades within Gopherus sensu stricto are well supported. Reanalysis of biogeographic relationships based on the phylogeny suggests that the origin of Gopherus sensu stricto can be traced to the Miocene on the Central Plains, later extending southward from eastern Arizona to Florida and from northern Texas to Aguascalientes during the Plio-Pleistocene. The extinction of giant gopher turtles in Texas and eastern Mexico associated with the invasion of their distribution area by G. berlandieri is the best hypothesis to explain the recent disjunct distribution of G. polyphemus and G. flavomarginatus.