Hi Frank:
Thanks for another great article
Although, I have never kept the dwarfs, I am very interested in the evolutionary study of the family
Pipidae. The dwarf frogs (genus
Hymenochirus) are more closely related to the South American
Pipa than to the larger African clawed frogs,
Xenopus. So it looks like
Pipa,
Hymenochirus and possibly the poorly known
Pseudhymenochirus belong to the subfamily
Pipinae. Xenopus belongs to the subfamily
Xenopodinae. To make matters more confusing,
Xenopus tropicalis and
X. epitropicalis have been moved to the genus
Silurana (new subfamily
Siluraninae) and they are also more related to
Pipa than to
Xenopus. Fossilized
Xenopus have been found in South America. I cannot think of a better example to show that Africa and South America were once one continent
