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^Lydeard, Charles; Cowie, Robert H.; Ponder, Winston F.; Bogan, Arthur E.; Bouchet, Philippe; Clark, Stephanie A.; Cummings, Kevin S.; Frest, Terrence J.; Gargominy, Olivier; Herbert, DAI G.; Hershler, Robert; Perez, Kathryn E.; Roth, Barry; Seddon, Mary; Strong, Ellen E.; Thompson, Fred G. (April 2004). "The global decline of nonmarine mollusks"(PDF). BioScience. 54 (4): 321–330. doi:10.1641/0006-3568(2004)054[0321:TGDONM]2.0.CO;2. Retrieved 20 Oct 2009.{{cite journal}}: CS1 maint: date and year (link)
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^Lin, J. P.; Gon, S. M.; Gehling, J. G.; Babcock, L. E.; Zhao, Y. L.; Zhang, X. L.; Hu, S. X.; Yuan, J. L.; Yu, M. Y.; Peng, J. (2006). "A Parvancorina-like arthropod from the Cambrian of South China". Historical Biology. 18 (1): 33–45. doi:10.1080/08912960500508689.
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