The evolution of whales
Whale phylogeny from The Tangled Bank, used with permission of the author, Carl Zimmer, and publisher, Roberts & Company, Greenwood Village, Colorado. Hippos are large and aquatic, like whales, but the two groups evolved those features separately from each other. We know this because the ancient relatives of hippos called anthracotheres (not ...
The Evolution of Whales: 5. Cladogram - PopSciColl
Cladogram for whales. To illustrate evolutionary history it is often useful to draw a tree diagram known as a cladogram , which shows the times at which various species diverged from each other. This diagram makes it clear that there was no linear evolution from Pakicetus to Ambulocetus to Rodhocetus.
Whippomorpha - Wikipedia
Cladogram showing Whippomorpha within Artiodactylamorpha: Whippomorpha consists of the clades labeled Hippopotamoidea and Cetaceamorpha. It is unknown whether the last common ancestor of whales and hippos led an aquatic, semiaquatic/amphibious, or terrestrial lifestyle.
Evolution of cetaceans - Wikipedia
Two endemic, distinctive types of short-finned pilot whale, Tappanaga (or Shiogondou) the larger, northern type and Magondou the smaller, southern type, can be found along the Japanese archipelago where distributions of these two types mostly do not overlap by the oceanic front border around the easternmost point of Honshu.
of character transformations that led to modern whale species. We honor Dr. Goodman’s work which included early application of rig-orous cladistic methods to molecular data (e.g., Goodman et al., 1985), his prescient use of a supermatrix approach for reconstruct-ing phylogenetic history (e.g., Miyamoto and Goodman, 1986), and
A phylogenetic blueprint for a modern whale - ScienceDirect
2013年2月1日 · The origin of Cetacea (whales) represents a key macroevolutionary transition within Mammalia. We assess the distribution of support among molecular datasets for Artiodactyla relationships. Three supermatrices of molecular and fossil data yield a composite phylogenetic hypothesis. We infer a phylogenetic blueprint that outlines the stepwi...
A cladogram, then, is a diagram that shows nested clades, representing nested levels of most recent common ancestry. An important point to keep in mind about cladograms is that they are like mobiles.
A cladogram showing the relationships among living baleen …
Whale baleen are long structures with high surface area that must be stiff enough to resist drag forces, yet flexible enough to behave as a dynamic filter by governing intra-oral flow fields [24,...
Cladogram - Definition and Examples | Biology Dictionary
2017年4月27日 · A cladogram is a diagram used to represent a hypothetical relationship between groups of animals, called a phylogeny. A cladogram is used by a scientist studying phylogenetic systematics to visualize the groups of organisms being compared, how they are related, and their most common ancestors.
Molecular evidence from retroposons that whales form a clade …
1997年8月14日 · Our data provide evidence that whales, ruminants and hippopotamuses form a monophyletic group. We attempted to resolve the issue of whether the order Artiodactyla is monophyletic or paraphyletic by...