challenge: What was the result of the 2006 taxonomic revision of poison dart frogs on the genus Colostethus?
  
  A. It was found to be polyphyletic and its species count was increased to 200
  B. It was found to be paraphyletic and its species count was reduced from 138 to 18
  C. It was found to be monophyletic and its species count remained unchanged
  D. It was found to be holophyletic and its species count was reduced to 50
  Answer: 