 The first specimens of the viper dogfish were two immature males caught off southern Japan by the bottom trawler Seiryo @-@ Maru in 1986 . The first , designated as the holotype , measured 22 cm ( 8 @.@ 7 in ) long and was collected off Cape Shiono at a depth of 330 m ( 1 @,@ 080 ft ) . The second measured 37 cm ( 15 in ) long and was collected off Hiwasa , Tokushima at a depth of 360 m ( 1 @,@ 180 ft ) . The shark was described as a new species and genus by University of Tokyo researchers Kenji Mochizuki and Fumio Ohe in a 1990 article for the Japanese Journal of Ichthyology . They gave it the name Trigonognathus kabeyai ; the generic name is derived from the Greek trigonon ( " triangle " ) and gnathus ( " jaw " ) , while the specific name honors Hiromichi Kabeya , the captain of the Seiryo @-@ Maru . 
