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Apomorphic and synapomorphic characteristics convey much information about evolutionary clades and can be used to define taxa. However, plesiomorphic and symplesiomorphic characteristics cannot. The term symplesiomorphy was introduced in 1950 by German entomologist Willi Hennig.
What counts as a synapomorphy for one clade may well be a primitive character or plesiomorphy at a less inclusive or nested clade. For example, the presence of mammary glands is a synapomorphy for mammals in relation to tetrapods but is a symplesiomorphy for mammals in relation to one another—rodents and primates, for example.
The terms "primitive" and "advanced", etc., are not properly used in referring to a species or an organism as any species or organism is a mosaic of primitive and derived traits. Using "primitive" and "advanced" may lead to "ladder thinking" (compare the Latin term scala naturae 'ladder of nature'), [ 8 ] which is the thought that all species ...
Willi Hennig 1972 Peter Chalmers Mitchell in 1920 Robert John Tillyard. The original methods used in cladistic analysis and the school of taxonomy derived from the work of the German entomologist Willi Hennig, who referred to it as phylogenetic systematics (also the title of his 1966 book); but the terms "cladistics" and "clade" were popularized by other researchers.
A real estate license must be obtained from the DRE in order to engage in the real estate business and to act in the capacity of a real estate broker or salesperson within the State of California. Before applying for a license, all education and experience requirements mandated by the Department must be fulfilled. [ 5 ]
Credit: The Other 98%. In the quote, Trump calls voters the "dumbest group of voters in the country." He continued, saying that they'd believe anything Fox broadcasts.
Andy Cohen is spilling the tea on what it's like working with longtime friend and colleague Anderson Cooper. Before SiriusXM's 10th Annual Radio Andy Holiday Hangout (which he co-hosts with Amy ...
In honor of his late partner, Lynda Cummings, Paul Bibby decorates his house with over 30,000 twinkling lights and 70,000 bulbs. The display includes inflatable festive figures and serves as a ...