In humans and other tailless primates ( e.g . great apes ) since Nakalipithecus ( a Miocene hominoid ) Masato ( 2004 ) , Acquisition of bipedalism , the coccyx is the remnant of a vestigial tail , but still not entirely useless .
In humans and other tailless primates ( e.g . great apes ) since Nakalipithecus ( a Miocene hominoid ) Masato ( 2004 ) , Acquisition of bipedalism , the coccyx is the remnant of a vestigial tail , but still not entirely useless ; Saladin ( 2003 ) , p 268 it
Coccyx