21. No mines were present in supplemental, qualitative Castle Rock collections selected for preservation and floral diversity (table S4), a procedure that in our experience increases mine recovery. 22. K. A. Spencer, Host Specialization in the World Agromyzidae (Diptera) (Kluwer, Dordrecht, Netherlands, 1990). 23. The increase in feeding diversity from latest Paleocene to early Eocene is significant when comparing total damage morphotypes per species (5), whereas bulk feeding diversity and mining diversity are not significantly different between these samples (Fig. 2). 24. One recent molecular and paleobiological study indicated the diversification of a clade of gracillariid moths that colonized the Betulaceae beginning È62.3 million years ago (25)
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