The fossil record demonstrates that mammals re‐entered the marine realm on at least seven
separate occasions. Five of these clades are still extant, whereas two are extinct. This review …

▪ Abstract The origin and early evolution of Cetacea (whales, dolphins, and porpoises) is
one of the best examples of macroevolution as documented by fossils. Early whales are …

In the tradition of GG Simpson's classic work, Kenneth D. Rose's The Beginning of the Age of
Mammals analyzes the events that occurred directly before and after the mysterious KT …

The emergence of Cetacea in the Paleogene represents one of the most profound
macroevolutionary transitions within Mammalia. The move from a terrestrial habitat to a …

Recent members of the order Cetacea (whales, dolphins, and porpoises) move in the water
by vertical tail beats and cannot locomote on land. Their hindlimbs are not visible externally …

Morphological and stratigraphic evidence indicates that land-living mesonychian ungulates
are broadly ancestral to early amphibious and later aquatic cetaceans. The transition from …

The whale ear, initially designed for hearing in air, became adapted for hearing underwater
in less than ten million years of evolution. This study describes the evolution of underwater …

Cynthiacetus peruvianus is a Dorudon-like basilosaurid (Cetacea, Basilosauridae), being
one of the largest members of the family. The holotype of this species is a sub-complete …

FIGURE 1. A comparison of the strict consensus tree of Thewissen et al.(2001b)(A) and the
strict consensus tree for the present study (B). Note that in the consensus of Thewissen et …

Abstract Knowledge of the phylogenetic position of the order Cetacea (whales, dolphins,
and porpoises) within Mammalia is of central importance to evolutionary biologists studying …