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ANAPSID.ORG, http://www.anapsid.org/cnd/mcs/maskcodes.html (last updated
"With Eorhynchochelys's diapsid skull, we know that turtles are not related to the early anapsid reptiles (those without openings), but are instead related to evolutionarily more advanced diapsid reptiles," Rieppel concluded. Modern-day snakes and lizards also evolved from the diapsid population.
I use VIN, Lafeber.com, Anapsid.org, PubMed, and Web of Science.