Demography of late Miocene rhinoceroses (Teleoceras proterum and Aphelops malacorhinus) from Florida: linking mortality and sociality in fossil assemblages

  title={Demography of late Miocene rhinoceroses (Teleoceras proterum and Aphelops malacorhinus) from Florida: linking mortality and sociality in fossil assemblages},
  author={Matthew C. Mihlbachler},
Abstract Among polygynous mammals, a heightened risk of mortality is linked to the intensity of intragender competition and life-history stages, such as sexual maturity, where inexperienced individuals are vulnerable to the aggressive behaviors of dominant individuals. In this respect, the age- and sex-specific mortality patterns found in fossil assemblages could be informative of sociality in extinct species. This possibility was explored by comparing the age- and sex-specific demography of… 

Palaeodemographics of small-bodied mammals in Pleistocene environments: a case study of muskrats (Ondatra zibethicus: Rodentia: Muridae) from north Florida

The fossil record shows a potential for investigating links between climate change and the demographics of palaeopopulations, and warmer temperatures, aridity, water table fluctuation, and human presence all comprise potential factors leading to a lower life expectancy during this time interval.

A Paleopopulation of Coryphodon lobatus (Mammalia: Pantodonta) from Deardorff Hill Coryphodon Quarry, Piceance Creek Basin, Colorado

Abstract A unique early middle Wasatchian paucispecific bone bed from Deardorff Hill in the Piceance Creek Basin of Colorado contains a minimum of 12 individuals of Coryphodon lobatus that range in

Evaluating Sexual Dimorphism in Postcranial Elements of Eurasian Extinct Stephanorhinus etruscus (Falconer, 1868) (Mammalia, Rhinocerotidae)

Sexual dimorphism has been poorly evaluated or investigated in Pleistocene Eurasian Stephanorhinus species, leaving a gap in our knowledge about their morphometric variability. Among the

Microwear—mesowear congruence and mortality bias in rhinoceros mass-death assemblages

Abstract. Although we do not know the cause of death of most fossil animals, mortality is often associated with ecological stress due to seasonality and other stochastic events (droughts, storms,

Sexual Dimorphism and Mortality Bias in a Small Miocene North American Rhino, Menoceras arikarense: Insights into the Coevolution of Sexual Dimorphism and Sociality in Rhinos

Demographic patterns in the Menoceras assemblage indicate that males suffered from a localized risk of elevated mortality at an age equivalent to the years of early adulthood, and indicates that young males were susceptible to the aggressive behaviors of dominant individuals in areas conducive to fossilization.

Sexual Dimorphism in Perissodactyl Rhinocerotid Chilotherium wimani from the Late Miocene of the Linxia Basin (Gansu, China)

According to the suite of dimorphic features of the skull of C. wimani, the tentative sex discriminant functions are set up in order to identify the gender of the skulls, and body mass sexual dimorphism is compared.

Species Level Revision of North American Rhinos Rectifies a Century of Poor Taxonomy

Large mammals have exerted a strong influence on our collective vision of the North American Cenozoic ever since early paleontologists, beginning with Joseph Leidy, described an unimaginably diverse



Paleoecology and population dynamics of the early Miocene (Hemingfordian) horse Parahippus leonensis from the Thomas Farm site, Florida

The horse Parahippus leonensis is the most numerous large mammal known from the important early Miocene Thomas Farm fossil locality, and despite having a variable dental morphology, morphometric studies indicate that only one species is represented.

Back–casting sociality in extinct species: new perspectives using mass death assemblages and sex ratios

Comparative data on sex–ratio variation and body–size dimorphism is relied on to shed light not only on the sociality of extinct species but provide a sound, although limited, footing for interpretation of modern death assemblages within the context of the emerging science of taphonomy and palaeobehaviour.

Population Dynamics of the Three-Toed Horse Neohipparion from the Late Miocene of Florida

A late Miocene population of Neohipparion cf. leptode from the Love Bone Bed of Florida was found to have 13 discrete annual age classes based on eruption sequences and tooth wear. The large sample

Taphonomy and population dynamics of an early Pliocene vertebrate fauna, Knox County, Nebraska

The principal purpose of this study is to determine from geological and biological evidence how a concentration of fossil bones originated. The Verdigre quarry of earliest Pli— ocene age in the

Sexual dimorphism and paleoecology in Teleoceras, a North American Miocene rhinoceros

  • A. Mead
  • Environmental Science
  • 2000
Sexual dimorphism is documented in 35 articulated adult skeletons, 24 females, and 11 males, of the Miocene rhinoceros Teleoceras major from Ashfall Fossil Beds, Nebraska, and the apparent herd structure and breeding-age sex ratio for the Ashfall herd suggests a behavioral ecology for T. major different from that of extantrhinoceroses.

Variation, sexual dimorphism, and social structure in the early Eocene horse Hyracotherium (Mammalia, Perissodactyla)

Patterns of dental and cranial variation are analyzed in a unique sample of early Eocene equid Hyracotherium from one fossil quarry of late Wasatchian age in the Huerfano Basin of southern Colorado suggesting, by comparison with modern ungulates, thatEarly Eocene horses were probably polygynous.


  • P. Currie
  • Environmental Science, Geography
  • 1998
In 1910, a collecting party from the American Museum of Natural History led by Barnum Brown floated down the Red Deer Riverof Alberta. In the Horseshoe Canyon Forma­ tion (Edmonton Group,

On the Extinct American Rhinoceroses and Their Allies

  • E. Cope
  • Geography
    The American Naturalist
  • 1879
TWVELVE species of mammals which may be called rhinoceroses, have been defined from materials obtained from the Tertiary formations of North America; and five additional species have been

The social regulation of population density and age-sex distribution in the toque monkey

As a consequence of these behaviorally imposed feeding efficiencies, young animals died at greater rates than adults, and infant and juvenile females died at greatest rates than their male peers; behaviorally mediated access to other resources is likely to influence mortality in a similar manner.