Molecular studies disagree with Simpson's classification of the Homino
idea, giving to each taxon of the former superfamily lower and lower r
anks. Goodman et al.'s latest proposal gives to the human clade the ra
nk of just a subgenus of the genus Homo. The designation of rank is ar
rived at (i) as a result of an arbitrary choice; (ii) as an ontologica
l condition. In the second case, adaptive ability may be a criterion t
o identify real higher taxa and give us a tool to keep the rank of fam
ily to classify the human clade (as well as the orang-utan, gorilla an
d chimpanzee clades).