16507
It can be distinguished from all its congeners , with the exception of the newly split " Kryptopterus geminus " , by the almost flat dorsal profile with no concavity behind the head .
 Kryptopterus
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Kryptopterus