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Chang, C.-H., Snyder, B.A. and Szlavecz, K. 2016.

Asian pheretimoid earthworms in North America north of Mexico: An illustrated key to the genera Amynthas, Metaphire, Pithemera, and Polypheretima (Clitellata: Megascolecidae)

. Zootaxa. 4179, 3 (Oct. 2016), 495–529. DOI:https://doi.org/10.11646/zootaxa.4179.3.7.