14845
Pappocetus differs from all other known protocetid genera by the step-like notch on the ventral margin of the mandible below M2 and M3 ; from Indocetus and Rodhocetus by the deciduous double-rooted P1 ; from Protocetus and Babiacetus by the presence of accessory cuspules ; and from Babiacetus by the unfused symphysis terminating just before P3 .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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