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Monognathus
''Monognathus'', or onejaw, is the only genus of the family Monognathidae of deep-sea, eel-like fishes. The name comes from the Greek ''monos'' meaning one and ''gnathos'' meaning jaw, a reference to the large mouth in comparison with the rest of the fish, and also the absence of an upper jaw (maxilla and premaxilla bones are absent). The dorsal and anal fins lack bony supports, the pectoral fins are missing. The snout has a fang which is connected to glands.
Typical lengths are from 4 to 10 cm (1.5–4 in), the maximum length recorded is 15.9 cm (6.3 in).
They are generally black in color, and are found at depths of over 2,000 m (6,600 ft).
== Species ==
The fifteen known species are:〔
* ''Monognathus ahlstromi'' Raju, 1974 (Paddletail onejaw)
* ''Monognathus berteli'' J. G. Nielsen & Hartel, 1996.
* ''Monognathus bertini'' Bertelsen & J. G. Nielsen, 1987.
* ''Monognathus boehlkei'' Bertelsen & J. G. Nielsen, 1987.
* ''Monognathus bruuni'' Bertin, 1936.
* ''Monognathus herringi'' Bertelsen & J. G. Nielsen, 1987.
* ''Monognathus isaacsi'' Raju, 1974.
* ''Monognathus jesperseni'' Bertin, 1936.
* ''Monognathus jesse'' Raju, 1974.
* ''Monognathus nigeli'' Bertelsen & J. G. Nielsen, 1987.
* ''Monognathus ozawai'' Bertelsen & J. G. Nielsen, 1987.
* ''Monognathus rajui'' Bertelsen & J. G. Nielsen, 1987.
* ''Monognathus rosenblatti'' Bertelsen & J. G. Nielsen, 1987.
* ''Monognathus smithi'' Bertelsen & J. G. Nielsen, 1987.
* ''Monognathus taningi'' Bertin, 1936.
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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