DNA-sequence data from the mitochondrial genome are being used with increasing
frequency to estimate phylogenetic relationships among animal taxa. The advantage to …

This paper presents the first complete estimate of the phylogenetic relationships among all
197 species of extant and recently extinct ruminants combining morphological, ethological …

The evidentiary basis of the currently accepted classification of living amphibians is
discussed and shown not to warrant the degree of authority conferred on it by use and …

Biologists often compare average phenotypes of groups of species defined cladistically or
on behavioral, ecological, or physiological criteria (eg, carnivores vs. herbivores, social vs …

Although they are relative latecomers on the evolutionary scene, having emerged only 135?
170 million years ago, angiosperms—or flowering plants—are the most diverse and species …

Observations that rates of molecular evolution vary widely within and among lineages have
cast doubts on the existence of a single “molecular clock.” Differences in the timing of …

All animals, including humans, are adapted to life in a microbial world. Anaerobic habitats
have existed continuously throughout the history of the earth, the gastrointestinal tract being …

INTRODUCTION This compilation is part of an on-going effort to maintain a comprehensive
and continually updated collection of large subunit (LSU; 23S and 23S-like) rRNA …

Despite numerous systematic studies, the relationships among many species within the dog
family, Canidae, remain unresolved. Two problems of broad evolutionary significance are …

The ruminants constitute the largest group of ungulates, with> 190 species, and its
distribution is widespread throughout all continents except Australia and Antarctica. Six …