A New Species of Small-Bodied Sparassodont (Mammalia, Metatheria) from the Middle Miocene Locality of Quebrada Honda, Bolivia

  title={A New Species of Small-Bodied Sparassodont (Mammalia, Metatheria) from the Middle Miocene Locality of Quebrada Honda, Bolivia},
  author={Russell K. Engelman and Darin A. Croft},
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… 

New Specimens of Acyon myctoderos (Metatheria, Sparassodonta) from Quebrada Honda, Bolivia

New specimens of the hathliacynid sparassodont Acyon myctoderos Forasiepi et al. from the middle Miocene locality of Quebrada Honda, Bolivia are described, including a juvenile specimen that preserves the first known hathliACYnid DP3.

Australogale leptognathus, gen. et sp. nov., a Second Species of Small Sparassodont (Mammalia: Metatheria) from the Middle Miocene Locality of Quebrada Honda, Bolivia

The Sparassodonta (Mammalia: Metatheria) were the principal group of carnivorous mammals in Cenozoic South America and an important component of this continent’s terrestrial predator guild for nearly

Diversity, Affinities and Adaptations of the Basal Sparassodont Patene (Mammalia, Metatheria)

Sparassodonts were the main mammalian predators during most of the Cenozoic in South America. The lower Eocene Itaborai Basin/ Formation includes the second oldest fossil records of this group in

New Mammal Faunal Data from Cerdas, Bolivia, a Middle-Latitude Neotropical Site that Chronicles the End of the Middle Miocene Climatic Optimum in South America

The mammals of Cerdas indicate that the middle latitudes (southern tropics) contributed significantly to the diversity of Miocene mammal communities in South America; and the Middle Miocene Climatic Optimum was a key factor in the differentiation of South American mammal assemblages.

Two New Macraucheniids (Mammalia: Litopterna) from the Late Middle Miocene (Laventan South American Land Mammal Age) of Quebrada Honda, Bolivia

Theosodon’ arozquetai and L. shockeyi are the first well-characterized macraucheniids from the middle Miocene, and the latter species demonstrates that relatively early-diverging lineages persisted at least 7 million years longer in tropical latitudes than they did in Patagonia.

Australohyaena antiqua (Mammalia, Metatheria, Sparassodonta), a large predator from the Late Oligocene of Patagonia

The genus Australohyaena gen. nov is proposed based on a phylogenetic reconstruction that demonstrates that A. antiqua is a Borhyaenidae (Mammalia, Sparassodonta), grouped with Arctodictis and Borhyaena, but not with Pharsophorus lacerans, the genus to which antiqua was formerly assigned.

Allqokirus australis (Sparassodonta, Metatheria) from the early Palaeocene of Tiupampa (Bolivia) and the rise of the metatherian carnivorous radiation in South America

The dental morphology of Allqokirus australis is extremely similar to that of Patene simpsoni from the early Eocene of Itaboraí (Brazil) and presents distinct (although incipient) carnivorous adaptations.

New mandibular remains of Callistoe (Metatheria, Sparassodonta) reveal unexpected anatomical, functional, and evolutionary aspects of this carnivorous genus

We present a detailed description of the anatomy of the dentary and lower teeth of a new specimen of Callistoe vincei, a large carnivorous metatherian from the Eocene (?Ypresian) of northwestern

New Proterotheriids from the Middle Miocene of Quebrada Honda, Bolivia, and Body Size and Diversity Trends in Proterotheriid and Macraucheniid Litopterns (Mammalia)

Abstract. In this work, we describe two new species of proterotheriid litopterns, Olisanophus riorosarioensis gen. et sp. nov. and Olisanophus akilachuta sp. nov. from the middle Miocene (Laventan

Insights Into the Neotropics Prior to the Great American Biotic Interchange: New Evidence of Mammalian Predators from the Miocene of Northern Colombia

A new species of Sparassodonta (Mammalia, Metatheria), Lycopsis padillai, sp.



A new thylacosmilid (Mammalia, Metatheria, Sparassodonta) from the Miocene of Patagonia, Argentina

A new genus and species, Patagosmilus goini, of the family Thylacosmilidae (Mammalia, Metatheria, Sparassodonta), based on a single specimen collected from the west margin of the Rio Chico, in Rio Negro Province, Argentina, from the middle Miocene Colloncuran SALMA, provides new anatomical data, likely to be included in future phylogenetic analyses.


A phylogenetic analysis including nine taxa of Sparassodonta, with Mayulestes as the outgroup, showed that Acyon is more closely related to Cladosictis than to any other hathliacynid.

Contribution to the Knowledge of the Sparassocynidae (Mammalia, Metatheria, Didelphoidea), with Comments on the Age of the Aisol Formation (Neogene), Mendoza Province, Argentina

The discovery of new specimens suggests that the stratigraphic level where the marsupial was found may have been deposited during the late Miocene (not older than Huayquerian times), which would mean that the sparassocynid clade has a long ghost lineage that covers at least 10 million years.

Sparassocynus (Marsupialia, Didelphidae), a peculiar mammal from the late Cenozoic of Argentina

The extinct genus Sparassocynus is known from the Montehermosan, Chapadmalalan, and Uquian stages of Argentina, spanning the Pliocene-Pleistocene transition, and a relative occurs in the older

New Middle Miocene Caviomorph Rodents from Quebrada Honda, Bolivia

The rodents of Quebrada Honda are more similar to those of Patagonia than those of northern South America, paralleling patterns seen in other mammal groups from this fauna.


  • D. Croft
  • Environmental Science, Geography
  • 2007
Abstract:  The Laventan Quebrada Honda Fauna of southern Bolivia is one of the best sampled middle Miocene South American faunas. The present study describes the toxodontid, interatheriid and

First Record and a New Species of Seriema (Aves: Ralliformes: Cariamidae) from Santacrucian (Early-Middle Miocene) Beds of Patagonia

New remains of seriemas are presented that were covered in 2005 by a joint expedition of the Museo de La Plata, Argentina, and Duke University, USA and represent the richest assemblage of pre-Pleistocene mammalian skulls and ar ticulated skeletons known in the continent.

Mayulestes ferox, a borhyaenoid (Metatheria, Mammalia) from the early Palaeocene of Bolivia. Phylogenetic and paleobiologic implications

Comparison with other borhyaenoid taxa indicates that the lack of tympanic process of the alisphenoid is in fact a plesiomorphic character state for the superfamily, and it is suggested that this feature appeared several times during marsupial evolution.

New didelphine marsupials from the La Venta fauna (Miocene) of Colombia, South America

A new genus and two new species of the marsupial subfamily Didelphinae, Marmosa laventica n. sp. and Hondadelphys fieldsi n. gen., n. sp. from the La Venta fauna (Friasian-late-Miocene) of Colombia,

Two new late Tertiary marsupials (Hathlyacyninae and Sparassocyninae) from the Bolivian Altiplano

Two new species of fossil Marsupialia are described from beds of late Tertiary age on the Altiplano south of La Paz, Bolivia. Borhyaenidium altiplanicus n. sp. (Borhyaenidae, Hathlyacyninae) is