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A ratite is any of a diverse group of large, flightless birds of the infraclass Palaeognathae. The systematics involved have been in flux. Some sources state that ratites include all the flightless birds of the Palaeognathae; previously, all these birds had been assigned to the order Struthioniformes, which is more recently regarded as containing only the ostrich. The modern bird superorder Palaeognathae consists of ratites and flighted Neotropic tinamous (compare to Neognathae). Unlike other flightless birds, the ratites have no keel on their sternum – hence the name from the Latin ratis (for raft). Without this to anchor their wing muscles, they could not fly even if they were to develop suitable wings. Recent research has indicated that ratites are a paraphyletic group; tinamous fall wi

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rdf:type
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  • Ratite
  • Ratitae
  • 平胸類
  • Loopvogels
  • Bezgrzebieniowce
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  • 平胸類(へいきょうるい、学名 Ratitae)は、現生鳥類の中で原始的なグループである古顎類の中で、完全な地上棲に進化したグループである。走鳥類(そうちょうるい)、走禽類(そうきんるい)とも。また、ダチョウ目を平胸類と同じに定義する説もある。 古顎類には平胸類のほかに、不完全な地上棲のシギダチョウ科が含まれる。希に平胸類や走鳥類にシギダチョウ科を含めることもあるが、ここではシギダチョウ科を含めないグループについて述べる。
  • A ratite is any of a diverse group of large, flightless birds of the infraclass Palaeognathae. The systematics involved have been in flux. Some sources state that ratites include all the flightless birds of the Palaeognathae; previously, all these birds had been assigned to the order Struthioniformes, which is more recently regarded as containing only the ostrich. The modern bird superorder Palaeognathae consists of ratites and flighted Neotropic tinamous (compare to Neognathae). Unlike other flightless birds, the ratites have no keel on their sternum – hence the name from the Latin ratis (for raft). Without this to anchor their wing muscles, they could not fly even if they were to develop suitable wings. Recent research has indicated that ratites are a paraphyletic group; tinamous fall wi
  • De loopvogels (Ratites) vormen een groep niet-vliegende vogels, die verwant is aan de tinamoes. De groep bevat de volgende ordes: * Struthioniformes (Struisvogels) * Rheiformes (Nandoes) * Casuariiformes (Kasuarissen en emoes) * Apterygiformes (Kiwi's) De DNA-resultaten van Hackett et al. van 2008 bevestigen de eenheid van de groep en plaatsen zelfs de tinamoes midden in deze orde. Hoe dat precies te rijmen valt met het vliegvermogen van de tinamoes en het -onvermogen van de andere groepen is niet helemaal duidelijk.
  • Bezgrzebieniowce (Ratitae) – termin odnoszący się do grupy ptaków cechujących się brakiem grzebienia na mostku, obejmujących przedstawicieli nadrzędu paleognatyczne poza kusaczami. Zaprzestano używania terminu bezgrzebieniowce w systematyce z uwagi na to, że wiele innych ptaków wtórnie niezdolnych do lotu, a będących bliskimi krewnymi ptaków latających, również nie posiada grzebienia. Do bezgrzebieniowych zalicza się: * kazuarowe (Casuariformes) * kiwi (Apterygiformes) * nandu (Rheiformes) * strusie (Struthioniformes) * mamutaki (Aepyornithiformes) † * Dinornithiformes †
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