During the Paleocene-Eocene Thermal Maximum (PETM),∼ 56 Mya, thousands of
petagrams of carbon were released into the ocean-atmosphere system with attendant …

We assembled a dataset of 192 carefully selected species—51 extinct and 141 extant—and
976 apomorphies distributed among 610 phenotypic characters to investigate the phylogeny …

Abstract The Upper Cretaceous outcrops of Armuña (Segovia Province, Spain) yielded
relatively abundant material of vertebrates during prospection and excavation in the second …

The first clear fossil indications of modern clades of snakes are in the Palaeogene. Many
major groups, including 'scolecophidians'(blindsnakes), probably originated earlier, and …

Phylonyms is an implementation of PhyloCode, which is a set of principles, rules, and
recommendations governing phylogenetic nomenclature. Nearly 300 clades-lineages of …

Many higher level avian clades are restricted to Earth's lower latitudes, leading to historical
biogeographic reconstructions favoring a Gondwanan origin of crown birds and numerous …

If an industrial civilization had existed on Earth many millions of years prior to our own era,
what traces would it have left and would they be detectable today? We summarize the likely …

Amphisbaenians are a poorly understood clade of fossorial lizards. Because of their derived
anatomy and relative scarcity, the systematics of the clade and its placement within …

abstract The historical biogeography of the lizard clade Iguanidae is complicated. In addition
to difficulties within the New World, where most of the more than 900 living species are …

The emergence of new technologies and improved computing power helped to introduce a
renewed vitality in morphological research in recent decades. This is especially apparent in …