57072
It is endemic to the Magdalena River Valley in Colombia , and has been considered possibly extinct , as there are no confirmed records since the type specimen was collected in 1943 .
 Magdalena River Valley, Colombia
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Magdalena River Valley, Colombia