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Middle Eocene rodents from Peruvian Amazonia reveal the pattern and timing of caviomorph origins and biogeography
TLDR
The phylogenetic results reaffirm the African origin of South American rodents and support a trans-Atlantic dispersal of these mammals during Middle Eocene times, and further extends the gap between first appearances of rodents and primates in South America.
A Jurassic mammaliaform and the earliest mammalian evolutionary adaptations
TLDR
A new fossil from the Middle Jurassic that has a mandibular middle ear, a gradational transition of thoracolumbar vertebrae and primitive ankle features, but highly derived molars with a high crown and multiple roots that are partially fused is described.
A Jurassic mammal from South America
TLDR
The discovery of a Jurassic mammal represented by a dentary, which is the first, to the authors' knowledge, from South America, indicates that the Australosphenida had diversified and were widespread in Gondwanaland well before the end of the Jurassic, and that mammalian faunas from the Southern Hemisphere already showed a marked distinction from their northern counterparts by the Middle to Late Jurassic.
Fossil evidence on evolution of inner ear cochlea in Jurassic mammals
TLDR
The cochlear innervation in Dryolestes is the precursory condition in the curve-to-coil transformation of the cochlea in mammalian phylogeny, which provides the timing of the evolution, and where along the phylogeny the morphogenetic genes were co-opted into patterning the coChlear Innervation.
Petrosal anatomy and inner ear structures of the Late Jurassic Henkelotherium (Mammalia, Cladotheria, Dryolestoidea): insight into the early evolution of the ear region in cladotherian mammals
TLDR
The reconstruction of the petrosal and inner ear features of the Late Jurassic dryolestoid mammal Henkelotherium guimarotae from high‐resolution computed tomography and three‐dimensional imaging analysis suggests a more ancient origination for high‐frequency hearing in mammalian history than previously thought.
New stem-lineage representatives of Zatheria (Mammalia) from the Late Jurassic of Portugal
Abstract Nanolestes drescherae, new genus and species, a stem-lineage representative of Zatheria, is represented by 48 isolated teeth, a dentary with p2 only, and an anterior dentary fragment with
Postcranial anatomy of Haldanodon exspectatus (Mammalia, Docodonta) from the Late Jurassic (Kimmeridgian) of Portugal and its bearing for mammalian evolution
TLDR
A PAUP analysis based on 280 cranio-dental and postcranial characters corroborated the position of Haldanodon above morganucodontids and below Hadrocodium.
MANDIBLE AND DENTITION OF ASFALTOMYLOS PATAGONICUS (AUSTRALOSPHENIDA, MAMMALIA) AND THE EVOLUTION OF TRIBOSPHENIC TEETH
TLDR
A PAUP 4.0 analysis based on 277 cranial and postcranial characters has corroborated the position of Asfaltomylos as the most basal member of the Australosphenida, and suggests that australosphenidans are independent from boreospenidans.
Early rodent incisor enamel evolution: Phylogenetic implications
  • T. Martin
  • Biology
    Journal of Mammalian Evolution
  • 1 December 1993
TLDR
Pauciserial HSB are structurally very close to the earliest known mammalian HSB found in Paleocene arctocyonids and biomechanical arguments and outgroup comparison with mixodontians indicate that the pauciserian Schmelzmuster is a symplesiomorphy of the Rodentia.
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