After Laurin & Reisz, 1997 and Vallin & Laurin, 2004

<==o †Lysorophia
   |?- †Brachydectes elongatus
   `--o †Lysorophidae
      |?- †Megamolgophis
      |-- †Cocytinus gyrinoides Cope, 1871b
      |-- †Lysorophus tricarinatus
      `--o †Molgophis
         |-- †M. brevicostatus
         |-- †M. macrurus Cope, 1868
         `-- †M. wheatleyi

Reference(s):

 

Special thanks to:

Dols, J. H. M., for gathering additional information and species.