126 
Psyche 
[March 
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2im SBupsiujAuJopnssj 
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■ ■ ■ ■ 3BpidS3y\ 
HHm 3BpiU3Uin^ 
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Figure 5. Geological time scale showing the distribution of twenty social insect families found in the fossil record. Dotted lines 
represent age extensions based on specimens of questionable taxonomic assignment. 
