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T. Okamoto and T. Hikida, “A new cryptic species allied to Plestiodon japonicus (Peters, 1864) (Squamata: Scincidae) from eastern Japan, and diagnoses of the new species and two parapatric congeners based on morphology and DNA barcode”, Zootaxa, vol. 3436, no. 1, pp. 1–23, Aug. 2012.