2016 年 35 巻 2 号 p. 75-82
A fossil identified as Orlitia borneensis was found from the river bottom of the Solo River in Sambungmacan, eastern Central Java, Indonesia. The sandy matrix attached to the specimen strongly suggests that it was eroded out from the Middle Pleistocene fluvial deposit on the river bank, as most of the assorted vertebrate fossils have been found from this area. Because two fragmentary fossils that were previously referred to this species from the Lower Pleistocene of Trinil lack diagnostic morphological characteristics, the specimen reported here is the first certain fossil record of the species from Java. The present findings suggest that O. borneensis had a wider distribution in the past, but the Java population would have become extinct by the end of the Middle Pleistocene.
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