ˈoʊnli wˈʌn vˈælɪd spˈiːsiːz ɪz ɹˈɛkəɡnˌaɪzd tədˈeɪ, ðə tˈaɪp spˈiːsiːz ˈɛm. dʒˈɛfɹɔɪˌɪaɪ nˈaʊ kˈɔːld ˈɛm. bɹˈɛvɪɹˌɑːstɹɪs.
Only one valid species is recognized today, the type species M. geoffroyii (now called M. brevirostris).