One and the same name applied both to a genus-group name and to an included species-group name e.g. Bison bison
<zoology> One and the same name applied both to a genus and to an included species for example Bison bison. ... (09 Jan 1998) ... 
tautonymy The state of having the species or subspecies name identical to the generic name of the genus in which it is placed. Absolute tautonymy is the identical spelling of a generic or subgeneric name and the specific or subspecific name of one of its originally included nominal species or subspecies. Linnaean tautonymy is the identical spelli...