Postcranial anatomy of <i>Sebecus icaeorhinus</i> (Crocodyliformes, Sebecidae) from the Eocene of Patagonia

Pol, Diego; Leardi, Juan Martín; Lecuona, A. Hernández; Krause, J. Marcelo

doi:10.1080/02724634.2012.646833

Cited by 111 publications

(235 citation statements)

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“…Whereas most of the macropredatory niches on other landmasses were occupied by eutherian carnivorans or creodonts, South America's carnivore guild was largely composed of metatherian mammals (Goin, 1995;, sebecosuchian crocodyliformes (Pol et al, 2012), giant boine and madtsoiid snakes (Head et al, 2009;Albino, 2011), and seriemas and their relatives, the aptly named phorusrhacid 'terror birds' (Alvarenga and Höfling, 2003;Noriega et al, 2009;Alvarenga et al, 2011). Little of this endemic carnivore diversity survives today, because South American ecosystems began to shift to a predatory guild dominated by eutherian carnivorans during the late Miocene (Huayquerian South American Land Mammal 'Age' or SALMA; Soibelzon 2011; Prevosti et al, 2013: fig.…”

Section: Introductionmentioning

confidence: 99%

A new species of small-bodied sparassodont (Mammalia, Metatheria) from the middle Miocene locality of Quebrada Honda, Bolivia

Engelman

Croft

2014

Journal of Vertebrate Paleontology

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ABSTRACT-The Sparassodonta (Mammalia, Metatheria) are a group of carnivorous mammals that dominated the macropredatory guild of South America during the Cenozoic. Here, we describe a new sparassodont based on a single specimen from the middle Miocene Quebrada Honda local fauna of southern Bolivia. This specimen (UF 27881) does not clearly correspond to any major sparassodont group (e.g., Hathliacynidae, Borhyaenidae, etc.) and represents a morphotype previously unknown among the Sparassodonta. UF 27881 is distinguished from other sparassodonts by its short, broad, borhyaenid-like rostrum and small size, among other features. However, we decline to coin a new name for UF 27881 due to the fragmentary nature of this specimen and the absence of most of its dentition. This specimen suggests that the appearance of the Sparassocynidae and several hypercarnivorous didelphid taxa (including Thylophorops, Thylatheridium, Lutreolina, and Hyperdidelphys) represent an evolutionary response to the decline in small, predatory sparassodont taxa during the late Cenozoic. This study documents new morphological diversity among the Sparassodonta and highlights the value of fossils from traditionally undersampled parts of South America.

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Section: Introductionmentioning

confidence: 99%

A new species of small-bodied sparassodont (Mammalia, Metatheria) from the middle Miocene locality of Quebrada Honda, Bolivia

Engelman

Croft

2014

Journal of Vertebrate Paleontology

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“…One of the most relevant contributions was the creation of Notosuchia (Gasparini, 1971) (Gasparini, 1972) and Peirosauridae (Gasparini, 1982), which were not considered part of Notosuchia until recently Pol, 2003;Turner and Sertich, 2010;Pol and Powell, 2011;Pol et al, 2012Pol et al, , 2014 (Gasparini, 1982) by recognizing the distinctness of Peirosaurus torminni from all other crocodyliforms, while studying the type materials of this taxon described originally by Price (1955), and more complete material discovered in Patagonia. These studies therefore organized the known diversity of Cretaceous crocodyliforms from South America by recognizing four basic groups: Notosuchidae, Uruguaysuchidae, Peirosauridae, and Baurusuchidae.…”

Section: Resumen Patrones De Diversidad De Notosuchia (Crocodyliformmentioning

confidence: 99%

“…The new discoveries, coupled with the inclusion of both Baurusuchidae and Peirosauridae within Notosuchia in recent phylogenetic studies (e.g., Turner and Sertich, 2010;Pol et al, 2012Pol et al, , 2014, revealed a previously unsuspected diversity of Notosuchian crocodyliforms. There has been an almost 4-fold increase in its known diversity during the last 25 years (Fig.…”

Section: The Diversity Of Cretaceous Crocodyliforms From Southmentioning

confidence: 99%

“…A strong component of recent research on notosuchians has been the use of cladistics analysis for testing the relationships of Notosuchia Pol, 2003;Carvalho et al, 2004;Turner and Sertich, 2010;Andrade et al, 2011;Montefeltro et al, 2011;Pol et al, 2012Pol et al, , 2014. Many of these studies are now corroborating the monophyly of the four Cretaceous clades early recognized by Gasparini for South American forms in pioneer contributions during her early career (i.e., Uruguaysuchidae, Peirosauridae, Baurusuchidae, and a clade allying Notosuchus and closely related forms; Gasparini, 1971Gasparini, , 1972Gasparini, , 1982.…”

Section: The Diversity Of Cretaceous Crocodyliforms From Southmentioning

confidence: 99%

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Reptiles Extintos - Volumen en Homenaje a Zulma Gasparini

2015

PE-APA

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“…Argillic texture of subsurface horizons and deep rhizoliths suggest well drainage and high moisture retention, although hypocoatings and Mn nodules indicate, at least, temporal waterlogging or gleying. Climate would be seasonal, subhumid, and probably warm-temperate or warm according to the singular herpetological fossil suite found in the CVM (Simpson, 1933;Albino, 1993, Pol et al, 2012. Complete carbonate leaching and smectite-dominated composition suggest a rainfall regime (MAP) not far beyond the humid side of the ustic-udic limit (Soil Survey Staff, 1998), this is in the range 650-850 mm/y.…”

Section: Middle Eocene Paleoclimate and Ecosystemsmentioning

confidence: 99%

Inicio del enfriamiento global del eoceno medio y expansión de ambientes con vegetación abierta en la patagonia central.

Bellosi

Krause

2014

Andgeo

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ABSTRACT. Climate-driven changes in terrestrial environments and biomes after the Early Eocene Climatic Optimum are poorly documented from southern continents. Particularly, Middle Eocene-Early Oligocene leaf and pollen data from Central Patagonia (46 o S, Argentina) are not sufficient to characterize floristic paleocommunities. Paleosols of the Cañadón Vaca (~45-42 Ma) and Gran Barranca (42-38.5 Ma) members (Sarmiento Formation), studied at Cañadón Vaca, solve such deficiency and help to reconstruct Middle Eocene landscapes in the beginning of the Cenozoic cooling-drying trend. Vitric Entisols, mollic Andisols and andic Alfisols, showing granular structure and diverse micropeds, are cyclically arranged mainly in response to variation in fine volcaniclastic eolian supply, which in turn governed ecosystem stability and maturity. Soils formed in loessic plains crossed by minor ephemeral rivers, supported open herbaceous-arboreal communities which grew in seasonal, subhumid and warm-temperate conditions. Phytoliths produced by Arecaceae, megathermic graminoids, sedges and dicots, from the upper part of the studied unit, represent subtropical savannas with grasses and variable number of palms and other trees. Considering the abundant paleobotanical and paleopedological antecedents of Late Paleocene-Early Eocene warm and humid forested environments in the same region, the lower Sarmiento Formation records the initial expansion of open herbaceous communities and the appearance of grassy habitats during the greenhouse to icehouse transition in the Middle Eocene. Keywords: Paleosol, Paleoclimate, Greenhouse-icehouse transition, Open-herbaceous communities. RESUMEN. Inicio del enfriamiento global del eoceno medio y expansión de ambientes con vegetación abierta en la Patagonia central. Los cambios en ambientes y biomas terrestres inducidos por el clima, con posterioridad al Óptimo del Eoceno Temprano, están pobremente documentados en continentes australes. Particularmente, la información sobre hojas y polen del Eoceno medio-Oligoceno inferior de Patagonia central (46 o S, Argentina) no es suficiente para caracterizar las paleocomunidades florísticas. Tal deficiencia es posible resolverla mediante el estudio de paleosuelos presentes en la sección inferior de la Formación Sarmiento en Cañadón Vaca, Miembros Cañadón Vaca (~45-42 Ma) y Gran Barranca (42-38.5 Ma), los que permiten reconstruir los ambientes del Eoceno medio en el comienzo del período de enfriamiento-desecación del Cenozoico. Los Entisoles vítricos, Andisoles mólicos y Alfisoles ándicos que exhiben estructura granular y microagregados diversos están cíclicamente ordenados en respuesta a variaciones del aporte eólico de material volcanoclástico fino, el cual a su vez gobernó la estabilidad y madurez de los ecosistemas. Los suelos formados en planicies loéssicas, con ríos efímeros subordinados, sostuvieron comunidades herbáceo-arbóreas abiertas, las que crecieron en condiciones subhúmedas, estacionales y cálido-templadas. Los fitolitos producidos por arecáceas,...

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Postcranial anatomy of Sebecus icaeorhinus (Crocodyliformes, Sebecidae) from the Eocene of Patagonia

Cited by 111 publications

References 41 publications

A new species of small-bodied sparassodont (Mammalia, Metatheria) from the middle Miocene locality of Quebrada Honda, Bolivia

A new species of small-bodied sparassodont (Mammalia, Metatheria) from the middle Miocene locality of Quebrada Honda, Bolivia

Reptiles Extintos - Volumen en Homenaje a Zulma Gasparini

Inicio del enfriamiento global del eoceno medio y expansión de ambientes con vegetación abierta en la patagonia central.

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