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The postorbital bar (or postorbital bone) is a bony arched structure that connects the frontal bone of the skull to the zygomatic arch, which runs laterally around the eye socket. It is a trait that only occurs in mammalian taxa, such as most strepsirrhine primates and the hyrax, while haplorhine primates have evolved fully enclosed sockets. One theory for this evolutionary difference is the relative importance of vision to both orders. As haplorrhines (tarsiers and simians) tend to be diurnal, and rely heavily on visual input, many strepsirrhines are nocturnal and have a decreased reliance on visual input.

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  • Barra postorbital
  • Postorbital bar
  • Barra pós-orbital
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  • A barra pós-orbital é um osso que fica atras das órbitas em Strepsirrhini. Contrasta com Haplorrhini, que possui todo o soquete das órbitas envolvidos por osso. Uma hipótese para tal diferença de estrutural é referente a importância da visão para cada um desses dois grupos de primatas. Strepsirrhini possui hábitos majoritariamente noturnos e a visão é um sentido pouco requisitado.
  • The postorbital bar (or postorbital bone) is a bony arched structure that connects the frontal bone of the skull to the zygomatic arch, which runs laterally around the eye socket. It is a trait that only occurs in mammalian taxa, such as most strepsirrhine primates and the hyrax, while haplorhine primates have evolved fully enclosed sockets. One theory for this evolutionary difference is the relative importance of vision to both orders. As haplorrhines (tarsiers and simians) tend to be diurnal, and rely heavily on visual input, many strepsirrhines are nocturnal and have a decreased reliance on visual input.
  • La barra postorbital es una estructura ósea, formada por la unión del maxilar superior y el proceso cigomático, que rodea la parte posterior de la órbita en algunos grupos de mamíferos. Todos los primates estrepsirrinos poseen esta estructura y los grupos extintos relacionados, los adapiformes y omomíidos, al contrario de los catarrinos, los cuales poseen una estructura llamada septo postorbital que aísla las órbitas de los músculos temporales.​​ En los estrepsirrinos se tiene la teoría que esta estructura tiene la finalidad de impedir que la visión se distorsiones durante la masticación y que a la vez tiene una función protectora del globo ocular.​
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  • La barra postorbital es una estructura ósea, formada por la unión del maxilar superior y el proceso cigomático, que rodea la parte posterior de la órbita en algunos grupos de mamíferos. Todos los primates estrepsirrinos poseen esta estructura y los grupos extintos relacionados, los adapiformes y omomíidos, al contrario de los catarrinos, los cuales poseen una estructura llamada septo postorbital que aísla las órbitas de los músculos temporales.​​ En los estrepsirrinos se tiene la teoría que esta estructura tiene la finalidad de impedir que la visión se distorsiones durante la masticación y que a la vez tiene una función protectora del globo ocular.​ Aparte de los primates estrepsirrinos, otros grupos de mamíferos poseen esta estructura, como los tenrecs, y algunos carnívoros, hiracoideos, artiodáctilos y marsupiales.​
  • The postorbital bar (or postorbital bone) is a bony arched structure that connects the frontal bone of the skull to the zygomatic arch, which runs laterally around the eye socket. It is a trait that only occurs in mammalian taxa, such as most strepsirrhine primates and the hyrax, while haplorhine primates have evolved fully enclosed sockets. One theory for this evolutionary difference is the relative importance of vision to both orders. As haplorrhines (tarsiers and simians) tend to be diurnal, and rely heavily on visual input, many strepsirrhines are nocturnal and have a decreased reliance on visual input. Postorbital bars evolved several times independently during mammalian evolution and the evolutionary histories of several other clades. Some species, such as Tarsiers, have a postorbital septum. This septum can be considered as joined processes with a small articulation between the frontal bone, the zygomatic bone and the and is therefore different from the postorbital bar, while it forms a composite structure together with the postorbital bar. Other species such as dermopterans have postorbital processes, which is a more primitive incomplete stage of the postorbital bar.
  • A barra pós-orbital é um osso que fica atras das órbitas em Strepsirrhini. Contrasta com Haplorrhini, que possui todo o soquete das órbitas envolvidos por osso. Uma hipótese para tal diferença de estrutural é referente a importância da visão para cada um desses dois grupos de primatas. Strepsirrhini possui hábitos majoritariamente noturnos e a visão é um sentido pouco requisitado.
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