The P ermian and T riassic were key time intervals in the history of life on E arth. Both
periods are marked by a series of biotic crises including the most catastrophic of such …

Ray‐finned fishes (A ctinopterygii) constitute approximately half of all living vertebrate
species. A stable hypothesis of relationships among major modern lineages has emerged …

Vertebrate vision is accomplished through light-sensitive photopigments consisting of an
opsin protein bound to a chromophore. In dim light, vertebrates generally rely on a single …

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 …

A vertebral column consisting of a persistent notochord and ossified arcocentra is the
primitive condition for Gnathostomata; it still persists in primitive actinopterygians and …

This study presents the first comprehensive revision of 'pholidophoriform'fishes, which are a
key taxon for understanding the early diversification of teleost fish. Systematic revisions of …

A new species (Marcopoloichthys mirigioliensis) of the stem teleosteomorph genus
Marcopoloichthys is described from the lower Besano Formation (late Anisian at Monte San …

The subclass Teleostei Müller was erected in 1845 to contain all fishes possessing
intermuscular bones (eg, epineurals and epipleurals) and two arterial valves (in the conus …

Insects are a highly diverse group of organisms and constitute more than half of all known
animal species. They have evolved an extraordinary range of traits, from flight and complete …

One of the properties of fossils is to provide unique ontogenies that have the potential to
inform us of developmental patterns and processes in the past. Although fossilized …