enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Primitive (phylogenetics) - Wikipedia

    en.wikipedia.org/wiki/Primitive_(phylogenetics)

    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 ...

  3. Plesiomorphy and symplesiomorphy - Wikipedia

    en.wikipedia.org/wiki/Plesiomorphy_and_symplesio...

    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.

  4. Apomorphy and synapomorphy - Wikipedia

    en.wikipedia.org/wiki/Apomorphy_and_synapomorphy

    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.

  5. Earliest known life forms - Wikipedia

    en.wikipedia.org/wiki/Earliest_known_life_forms

    Evidence of possibly the oldest forms of life on Earth has been found in hydrothermal vent precipitates. [1]The earliest known life forms on Earth may be as old as 4.1 billion years (or Ga) according to biologically fractionated graphite inside a single zircon grain in the Jack Hills range of Australia. [2]

  6. Living fossil - Wikipedia

    en.wikipedia.org/wiki/Living_fossil

    The fact that a living fossil is a surviving representative of an archaic lineage does not imply that it must retain all the "primitive" features (plesiomorphies) of its ancestral lineage. Although it is common to say that living fossils exhibit "morphological stasis", stasis, in the scientific literature, does not mean that any species is ...

  7. Prosimian - Wikipedia

    en.wikipedia.org/wiki/Prosimian

    The prosimians have retained the primitive mammalian condition of a bicornuate uterus, with two separate uterus chambers. In the simians, the uterus chambers have fused, an otherwise rare condition among mammals. Prosimians usually have litters rather than single offspring, which is the norm in higher primates.

  8. Primitivism - Wikipedia

    en.wikipedia.org/wiki/Primitivism

    In a Tropical Forest Combat of a Tiger and a Buffalo (1908–1909), by Henri Rousseau. In the arts of the Western World, Primitivism is a mode of aesthetic idealization that means to recreate the experience of the primitive time, place, and person, either by emulation or by re-creation.

  9. Craniate - Wikipedia

    en.wikipedia.org/wiki/Craniate

    In other words, the cyclostome characteristics (e.g. horny teeth on a "tongue", gill pouches) are either instances of convergent evolution for feeding and gill ventilation in animals with an eel-like body shape, or represent primitive craniate characteristics subsequently lost or modified in gnathostomes.