Description: English: Calamaria bitorques (KU 327409) from Barangay Dibuluan, San Mariano. Photo: ACD. Date: 7 February 2013, 22:30:13. Source: Brown R, Siler C, Oliveros C, Welton L, Rock A, Swab J, Van Weerd M, van Beijnen J, Rodriguez D, Jose E, Diesmos A (2013). "The amphibians and reptiles of Luzon Island, Philippines, VIII: The herpetofauna of Cagayan and Isabela Provinces, northern Sierra Madre Mountain Range". ZooKeys 266: 1.
DOI:
10.3897/zookeys.266.3982. Author: Brown R, Siler C, Oliveros C, Welton L, Rock A, Swab J, Van Weerd M, van Beijnen J, Rodriguez D, Jose E, Diesmos A.