An unprecedented level of confidence has recently crystallized around a new hypothesis of
how living placental mammals share a pattern of common descent. The major groups are …

Since their recruitment in the oral cavity, approximately 450 million years ago, teeth have
been subjected to strong selective constraints due to the crucial role that they play in species …

Dating the tree of life is a core endeavor in evolutionary biology. Rates of evolution are
fundamental to nearly every evolutionary model and process. Rates need dates. There is …

Dugongs and manatees, the only fully aquatic herbivorous mammals, live in the coastal
waters, rivers and lakes of more than 80 subtropical and tropical countries. Symbols of fierce …

No large group of recently extinct placental mammals remains as evolutionarily cryptic as
the approximately 280 genera grouped as 'South American native ungulates'. To Charles …

The development of distinct regions in the amniote vertebral column results from somite
formation and Hox gene expression, with the adult morphology displaying remarkable …

Alcidedorbignya inopinata is a basal pantodont (Placentalia, Mammalia) of small body size,
from the early Palaeocene of the Santa Lucia Formation at Tiupampa, Bolivia. Tiupampa is …

Elephants are the only living representatives of the Proboscidea, a formerly diverse
mammalian order whose history began with the 55-million years (mys) old Phosphatherium …

Living mammal groups exhibit rapid juvenile growth with a cessation of growth in adulthood.
Understanding the emergence of this pattern in the earliest mammaliaforms (mammals and …

From two scientists who have been at the forefront of manatee research for over three
decades, The Florida Manatee offers an engaging, accessible introduction to manatee …