370415
Rhynchorthoceras is a Middle Ordovician genus characterized by a rapidly expanded , weakly annulate orthocone , like the orthoconic section of Ancistroceras , but with only a curved , cyrtoconic apex instead of juvenile whorls .
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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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