It was defined by Michel Laurin (2001) and Vallin and Laurin (2004) as the largest clade that includes Homo sapiens, but not Ascaphus truei (tailed frog).
Ovu grupu su definisali Mišel Laurin (2001), i Valin i Laurin (2004) kao najveći kladus koji obuhvata Homo sapiens, ali ne Ascaphus truei.