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Penghu 1 is a fossil jaw (mandible) belonging to an extinct hominin species of the genus Homo from Taiwan that is late Pleistocene in age.

The fossil consists of a nearly complete right lower jaw with four teeth, including molars and premolars.

The specimen was assigned to the genus Homo based on jaw and tooth proportions, described as most similar to Hexian fossils of Homo erectus, but the species identity or taxonomic relationships lack consensus due to limited material. Co-author Yousuke Kaifu cautioned that additional skeletal parts are needed before species evaluation, but paleontologist Mark McMenamin argued that unique dental characteristics of the jaw were sufficient to establish a separate species, which he dubbed Homo tsaichangensis

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