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Amphibian fossils excavated from two Late Pleistocene-Holocene fissures in the southern part of Okinawajima Island in the Ryukyu Archipelago were identified through detailed comparisons with skeletal specimens of extant taxa. The identified species (eight frogs and two newts) were confined to extant elements on the island and were mostly endemic to either the island or the central part of the archipelago including it. Previous Late Pleistocene records of extralimital frogs (two mainland Japanese species [Glandirana rugosa and Rana tagoi] and one Southeast Asian frog currently naturalized in the Ryukyus [Polypedates leucomystax]) from one of the study sites (the Minatogawa Fissure) are therefore considered misidentifications. This may also be the case with Fejervarya kawamurai, a synanthropic frog currently widely distributed in East Asia, including the Central Ryukyus. Of the species obtained from the Late Pleistocene deposits at these sites, five frogs (Limnonectes namiyei, Babina holsti, Odorrana ishikawae, O. narina, and Rana ulma) are forest-dwellers currently confined to the northern forested area of Okinawajima. Additionally, none of these species were detected in the middle Holocene deposits from one of the sites, the Sashiki Fissure. Our findings indicate that the southern limestone area of Okinawajima in the Late Pleistocene harbored a dense and humid forest with diverse lotic habitats, similar to the northern forested area of the island at present, and that these environmental conditions were lost by the midpoint of the Holocene Period.

palaeontologia electronica

Late Pleistocene-Holocene amphibians from Okinawajima Island in the Ryukyu Archipelago, Japan: Reconfirmed faunal endemicity and the Holocene range collapse of forest-dwelling species