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Edward Hitchcock's fold-out paleontological chart in his 1840 Elementary Geology. Although tree-like diagrams have long been used to organise knowledge, and although branching diagrams known as claves ("keys") were omnipresent in eighteenth-century natural history, it appears that the earliest tree diagram of natural order was the 1801 "Arbre botanique" (Botanical Tree) of the French ...
The idea of a tree of life arose from ancient notions of a ladder-like progression from lower into higher forms of life (such as in the Great Chain of Being).Early representations of "branching" phylogenetic trees include a "paleontological chart" showing the geological relationships among plants and animals in the book Elementary Geology, by Edward Hitchcock (first edition: 1840).
The blue and orange subgroups are clades, each defined by a common ancestor stem at the base of its respective subgroup branch. The green subgroup alone, however, is not a clade; it is a paraphyletic group relative to the blue subgroup because it excludes the blue branch, which shares the same common ancestor. Together, the green and blue ...
A tree structure, tree diagram, or tree model is a way of representing the hierarchical nature of a structure in a graphical form. It is named a "tree structure" because the classic representation resembles a tree , although the chart is generally upside down compared to a biological tree, with the "stem" at the top and the "leaves" at the bottom.
Cass Street Park is a series of large scale painted fiberglass sculptures designed to enhance a small park in the Brady Street neighborhood of Milwaukee. Elements include a cat-shaped gateway arch, a dragon, two light poles and a bird. All of the forms are painted in bright colors, adding to the whimsical feel of the site. [2]
A gray whale surfaces with open eyes in Laguna San Ignacio, Baja California, where the species goes to calve and nurse its young. (Carolyn Cole / Los Angeles Times) The story of the gray whales ...
A San Diego-based ecotour operator has captured stunning aerial footage, perhaps first of its kind, showing Cuvier’s beaked whales swimming along the surface. Rare footage shows elusive ...
Out of nowhere, two giant blue whales rose from under Captain CiCi Sayer and Dale Frink's boat off the coast of San Diego July 2, casting them into the ocean. Thankfully neither was hurt ...