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The P. hopkinsi holotype is described from a single forewing that is long preserved in a section of siltstone concretion also containing Blattodea , Hemiptera , Mecoptera , and Diptera specimens .
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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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