The relict family Myerslopiidae is restricted to New Zealand and South America while the Melizoderidae consist of two genera restricted to South America. The great diversity of Neotropical taxa suggests that the group originated in that region.
The Myerslopiidae family is limited to New Zealand and South America, while the Melizoderidae consist of only two genera found in South America. This suggests that the group's diversity likely arose in the Neotropics.