ユーリプテルス
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↑ Selden, Paul A.; Jeram, Andrew J. (1989). “Palaeophysiology of terrestrialisation in the Chelicerata” (英語). Earth and Environmental Science Transactions of the Royal Society of Edinburgh 80 (3-4): 303–310. doi:10.1017/S0263593300028741. ISSN 1755-6910. https://web.archive.org/web/20110803072642/http://homepage.mac.com/paulselden/Sites/Website/Palaeophysiology.pdf.