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Hypsiglena unaocularis
''Hypsiglena unaocularis'', commonly known as the Clarion nightsnake, is a species of small colubrid snake endemic to Clarion Island, initially described from a single specimen collected by William Beebe in 1936. During the next several decades, scientists were unable to detect any trace of the snake in their field studies. After an intensive search in 2013, a team of scientist identified 11 snakes that matched the original description of the species. They conducted a series of DNA tests to confirm that the Clarion nightsnake, formerly viewed as the subspecies ''Hypsiglena torquata unaocularis'', is genetically distinct from related mainland snakes and should be recognized as a full species.〔(News Releases, Smithsonian Scientist Discovers Lost Species of Nightsnake in Mexico, The Smithsonian, May 19, 2014 )〕 While never formally declared extinct, this species remained absent from scientific literature due to two main factors: its home on Clarion is extremely remote and only accessible by military escort, significantly restricting the number of biologists who can access this area, and the snake’s secretive, nocturnal behavior and dark coloration make it difficult to detect in the field. Because of the lack of follow-up sightings, scientists long presumed that Beebe had provided an incorrect locality for his specimen.〔〔
==Description==
The snakes are brownish black in color and have a characteristic series of darker spots on their head and neck and grows to be approximately 18 inches long.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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