28200
More than 100 genera have been described , and well known forms include " Arkarua " , " Charnia " , " Dickinsonia " , " Ediacaria " , " Marywadea " , " Cephalonega " , " Pteridinium " , and " Yorgia " .
 Arkarua
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Arkarua