Wilhem de Haan described the new genus Brachynotus in 1833 , and B. sexdentatus was eventually designated its type species .
Brachynotus sexdentatus was first described by Antoine Risso in 1827 , as a species in the genus Goneplax .
Wilhem de Haan described the new genus Brachynotus in 1833 , and Brachynotus sexdentatus   was eventually designated its type species .
Brachynotus sexdentatus was first described by Antoine Risso in 1827 , as a species in the genus Goneplax .