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Cranial evolutionary allometry (CREA) is a scientific theory regarding trends in the shape of mammalian skulls during the course of evolution in accordance with body size (i.e., allometry). Specifically, the theory posits that there is a propensity among closely related mammalian groups for the skulls of the smaller species to be short and those of the larger species to be long. This propensity appears to hold true for placental as well as non-placental mammals, and is highly robust. Examples of groups which exhibit this characteristic include antelopes, fruit bats, mongooses, squirrels and kangaroos as well as felids.

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  • Cranial evolutionary allometry (en)
  • Alometria evolutiva craniana (pt)
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  • Cranial evolutionary allometry (CREA) is a scientific theory regarding trends in the shape of mammalian skulls during the course of evolution in accordance with body size (i.e., allometry). Specifically, the theory posits that there is a propensity among closely related mammalian groups for the skulls of the smaller species to be short and those of the larger species to be long. This propensity appears to hold true for placental as well as non-placental mammals, and is highly robust. Examples of groups which exhibit this characteristic include antelopes, fruit bats, mongooses, squirrels and kangaroos as well as felids. (en)
  • Alometria evolutiva craniana (CREA) é uma teoria científica sobre as tendências na forma de crânios mamíferos durante o curso da evolução, de acordo com o tamanho do corpo (por exemplo, allometry). Especificamente, a teoria postula que há uma propensão entre intimamente relacionados mamíferos grupos para os crânios das espécies menores para serem curtos e os de espécies maiores, para serem longos. Esta tendência parece manter-se verdadeira para a placenta, assim como os mamíferos não-placentários, e é muito robusta. Exemplos de grupos que apresentam esta característica incluem antílopes, os morcegos frugívoros, mongooses, esquilos e cangurus bem como felinos. (pt)
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  • Cranial evolutionary allometry (CREA) is a scientific theory regarding trends in the shape of mammalian skulls during the course of evolution in accordance with body size (i.e., allometry). Specifically, the theory posits that there is a propensity among closely related mammalian groups for the skulls of the smaller species to be short and those of the larger species to be long. This propensity appears to hold true for placental as well as non-placental mammals, and is highly robust. Examples of groups which exhibit this characteristic include antelopes, fruit bats, mongooses, squirrels and kangaroos as well as felids. It is believed that the reason for this trend has to do with size-related constraints on the formation and development of the mammalian skull. Facial length is one of the best known examples of heterochrony. (en)
  • Alometria evolutiva craniana (CREA) é uma teoria científica sobre as tendências na forma de crânios mamíferos durante o curso da evolução, de acordo com o tamanho do corpo (por exemplo, allometry). Especificamente, a teoria postula que há uma propensão entre intimamente relacionados mamíferos grupos para os crânios das espécies menores para serem curtos e os de espécies maiores, para serem longos. Esta tendência parece manter-se verdadeira para a placenta, assim como os mamíferos não-placentários, e é muito robusta. Exemplos de grupos que apresentam esta característica incluem antílopes, os morcegos frugívoros, mongooses, esquilos e cangurus bem como felinos. Acredita-se que a razão para esta tendência tem a ver com tamanho de constrangimentos relacionados com a formação e o desenvolvimento do crânio dos mamíferos. O comprimento facial é um dos exemplos mais conhecidos de heterocronia. (pt)
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