... and above several molars of the perissodactyl cf. Hyracotherium sp. This arrangement is unusual, as in the ... Paleocene, Tillodontia from the Paleocene and Eocene, while Hyracotherium is known only from the Eocene. The expected ... be, from lowest to highest, Barylambdidae, Tillodontia, and Hyracotherium. It is suggested that the Baja California assemblage ... the basis of the generalized molars of cf. Hyracotherium sp. and the characters of cf. Esthonyx sp.
Tópico(s): Wildlife Ecology and Conservation
1966 - American Association for the Advancement of Science | Science
... in a unique sample of early Eocene equid Hyracotherium from one fossil quarry of late Wasatchian age ... Eocene horses were probably polygynous. The appearance of Hyracotherium in North America and its rise to dominance ... woodland and savanna habitats. The evolutionary success of Hyracotherium may reflect, in part, the adaptive superiority of ...
Tópico(s): Animal Behavior and Welfare Studies
1981 - Cambridge University Press | Paleobiology
... 121 characters. This analysis supports the identification of Hyracotherium as a primitive equoid and its restriction to the genotype, Hyracotherium leporinum. Sifrhippus gen. nov. is erected for the sister taxon of all other equids, Hyracotherium sandrae Gingerich. Minippus gen. nov., the next more- ... Cope. This taxon has historically been placed within Hyracotherium yet this analysis allies it with Cymbalophus near ...
Tópico(s): Pleistocene-Era Hominins and Archaeology
2002 - Oxford University Press | Zoological Journal of the Linnean Society
... revision of the British specimens of the genus Hyracotherium . As far back as the year 1901, Depéret ... of the very few known English specimens of Hyracotherium has been undertaken in an endeavour to fulfil ...
Tópico(s): Mediterranean and Iberian flora and fauna
1932 - Royal Society | Philosophical Transactions of the Royal Society of London Series B Containing Papers of a Biological Character
D.R. Kelley, Albert Elmer Wood,
... a statistical analysis of two genera, Hyopsodus and Hyracotherium, which shows that the morphologic characters heretofore used ... than three species of Hyopsodus and two of Hyracotherium are present. Two new species are described: Thryptacodon ...
Tópico(s): Animal Ecology and Behavior Studies
1954 - Cambridge University Press | Journal of Paleontology
Hyracotherium cuniculus Owen, 1842, from Palaeocene-Eocene boundary strata in NW Europe, was formerly considered to be ... with the fundamental perissodactyl morphotype as represented in Hyracotherium. It is suggested that the Lophiodontidae (formerly considered ...
Tópico(s): Geology and Paleoclimatology Research
1984 - Oxford University Press | Zoological Journal of the Linnean Society
Journal Article Fossil horses from “Eohippus” (Hyracotherium) to Equus, 2: rates of dental evolution revisited Get access BRUCE J. MACFADDEN BRUCE J. MACFADDEN 1Florida State Museum, University of Florida, ...
Tópico(s): Wildlife Ecology and Conservation
1988 - Oxford University Press | Biological Journal of the Linnean Society
Nikos Solounias, Gina M. Semprebon,
... extant ungulates. Two major clusters are discerned: (1) Hyracotherium has microwear most similar to that of the ... bairdii), Parahippus spp., and Merychippus insignis differ from Hyracotherium and are most similar to the extant Cervus ...
Tópico(s): Bat Biology and Ecology Studies
2002 - American Museum of Natural History | American Museum Novitates
... perissodactyls and among those taxa historically included in "Hyracotherium" are complicated. These taxa are morphologically similar, possessing ... anagenetically evolving lineage. The results also suggest that "Hyracotherium" is not representative of the basal morphology of ...
Tópico(s): Morphological variations and asymmetry
1999 - Taylor & Francis | Journal of Vertebrate Paleontology
Kenneth D. Rose, Luke Holbrook, W. Patrick Luckett,
... Eocene Equidae from North America, conventionally attributed to 'Hyracotherium', are described and compared, based primarily on a ... be applied, and we employ the widespread name 'Hyracotherium' (acknowledging that the type species may not be ...
Tópico(s): Paleontology and Evolutionary Biology
2017 - Taylor & Francis | Historical Biology
... in Suffolk, indicative of a new Species of Hyracotherium (Hyr. Cuniculus) Annals and Magazine of Natural History: ...
Tópico(s): Evolution and Paleontology Studies
1841 - Taylor & Francis | Annals and Magazine of Natural History
Plate XXI. Until the present year, the remains of the highest organized animals which were known to exist in the marine Eocene deposit called the London Clay, were those of Reptiles and Fishes; and the danger of founding conclusions in Palæontology from negative evidence was, perhaps, never more strikingly illustrated than by the fact, that the first scientifically determined relic of a warm-blooded animal from that formation proved to belong not only to the Mammiferous class, but to the highest ...
Tópico(s): Paleontology and Evolutionary Biology
1841 - Geological Society of London | Transactions of the Geological Society of London
... a late date, and cannot be derived from Hyracotherium. With the exception of Plagiolophus , they show in ...
Tópico(s): Evolution and Paleontology Studies
1952 - Zoological Society of London | Proceedings of the Zoological Society of London
Tópico(s): Botanical Research and Applications
1968 - Natural History Museum Los Angeles County | Contributions in science
Glenn L. Jepsen, Michael O. Woodburne,
A lower jaw of an eohippus (Hyracotherium cf. H. angustidens) from late Paleocene strata in Wyoming has extended the geological record of fossil horses into pre-Eocene time and ...
Tópico(s): Geology and Paleoclimatology Research
1969 - American Association for the Advancement of Science | Science
... be from a condylarth. Newly prepared endocasts of Hyracotherium , the oldest horse and one of the earliest ...
Tópico(s): Plant Diversity and Evolution
1976 - American Association for the Advancement of Science | Science
... aft running motion first developed during late Paleocene (Hyracotherium). Since then, almost all the modifications contributed in ...
Tópico(s): Comparative Animal Anatomy Studies
1975 - Wiley | Anatomia Histologia Embryologia
... Coryphodon, Esthonyx, Palaeosinopa, Didymictis, Hapalodectes, Bunophorus, Diacodexis, Phenacodus, Hyracotherium, Heptodon, and Shoshonius, all of which last appear ...
Tópico(s): Geology and Paleoclimatology Research
1984 - | Annals of Carnegie Museum
The evolution of body size in fossil horses is frequently depicted as a gradual, progressive trend toward increased body size (Cope's Law). Body size (actually body mass) was estimated for 40 species of fossil horses using dental and skeletal characters and regression equations derived from the same characters in extant species of Equus with known body mass. After body sizes were estimated, rates of morphological evolution, in darwins (d), were calculated between known ancestral and descendant fossil ...
Tópico(s): Genetic and phenotypic traits in livestock
1986 - Cambridge University Press | Paleobiology
... 87 characters. The outgroup method was employed using Hyracotherium, Pachynolophus, Danjiangia, and Lambdotherium. Two analyses were performed, ...
Tópico(s): Bat Biology and Ecology Studies
2008 - American Museum of Natural History | Bulletin of the American Museum of Natural History
Aaron R. Wood, Ryan M. Bebej, Carly L. Manz, Dana L. Begun, Philip D. Gingerich,
Tópico(s): Ecology and biodiversity studies
2010 - Springer Science+Business Media | Journal of Mammalian Evolution
Maëva J. Orliac, Christine Argot, Emmanuel Gilissen,
... Phenacodus (Phenacodontidae), as well as to basal perissodactyls (Hyracotherium) and artiodactyls (Cebochoerus, Homacodon). Hyopsodus presents one of ...
Tópico(s): Primate Behavior and Ecology
2012 - Public Library of Science | PLoS ONE
Jeremy Hooker, Demberelyin Dashzeveg,
... new genus of perissodactyl, Protomoropus , for the species ‘ Hyracotherium ’ gabuniai Dashzeveg and its inclusion with a diversity ...
Tópico(s): Bat Biology and Ecology Studies
2004 - Wiley | Palaeontology
Brianna K. McHorse, Andrew A. Biewener, Stephanie E. Pierce,
... spectrum of digit reduction and body sizes, from Hyracotherium to Equus . To account for the load-bearing ...
Tópico(s): Veterinary Equine Medical Research
2017 - Royal Society | Proceedings of the Royal Society B Biological Sciences
... 25 years. If two-hands tall Eohippus or Hyracotherium, the browsing forest-dweller with which equine evolution ...
Tópico(s): Reproductive Physiology in Livestock
2018 - Wiley | Equine Veterinary Journal
Nikos Solounias, Melinda Danowitz, Elizabeth Stachtiaris, Abhilasha Khurana, Marwan Araim, Marc Sayegh, Jessica Natale,
... tridactyl Mesohippus, but are absent in the tetradactyl Hyracotherium. The carpal articulations of the five metacarpals match ...
Tópico(s): Evolution and Paleontology Studies
2018 - Royal Society | Royal Society Open Science
Owen,
... of size they differ from those teeth in Hyracotherium leporinum in about the same degree as do those of Hyracotherium cuniculus , but exhibit a modification of generic value.
Tópico(s): Comparative Animal Anatomy Studies
1865 - Cambridge University Press | Geological Magazine
... molar series of teeth on which the genus Hyracotherium was founded. But the subject of the present ...
Tópico(s): Pleistocene-Era Hominins and Archaeology
1858 - Geological Society of London | Quarterly Journal of the Geological Society
Spencer G. Lucas, Steven M. Cather, John C. Abbott, Thomas E. Williamson,
... strata of the Galisteo Formation. The index fossil Hyracotherium sp. establishes the Wasatchian (late Paleocene-early Eocene) ...
Tópico(s): Archaeology and Natural History
1997 - | New Mexico Geology
... Tapirus, Fells, Hycena , and Sus ; and 3rd, the Hyracotherium and Coryphodon, which forms are elsewhere eminently characteristic ...
Tópico(s): Morphological variations and asymmetry
1865 - Geological Society of London | Quarterly Journal of the Geological Society