Majungasaurus an rarraba shi a matsayin memba na theropod clade Abelisauridae, wanda aka dauke shi dangi a cikin Linnaean haraji. Tare da dangin Noasauridae, an haɗa abelisaurids a cikin superfamily Abelisauroidea, wanda a biyun ya zama wani yanki na infraorder Ceratosauria. Abelisaurids sanannu ne saboda manyan kawunansu tare da tsayayyun hanci, zane-zane mai zurfi a saman ƙasusuwan fuska (daidaitawa da carcharodontosaurids), raguwa sosai (atrophied) forelimbs (daidaitawa da tyrannosaurids), da kuma tsayayyen bayan gida, a tsakanin sauran fasali. Kamar yadda yake tare da dangin dinosaur da yawa, tsarin (evolutionary) a cikin dangin Abelisauridae an cire shi.
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