Primate family (The corect name)

[Ronaldo Alperin]

     To ALL,


        I would like to know an explanation concerning the formation of
the family name of the genus Callithrix (a platyrrhine monkey).
Callithrix seems to me the correct name Callithricidae, but most authors
use Callithrichidae. I see no reason to add the suffix "chidae" once
"thrix" is derived from greek "trichos". The word is "thrix" and the
termination is "tricidae" is not it?
        Please send me you opinion.

                                Regards,
                                        Ronaldo Alperin