Iwama, R. E., Oceguera-Figueroa, A., de Carle, D., Manglicmot, C., Erséus, C., Miles, N. M.-S., Siddall, M. E., & Kvist, S. (2019).

Broad geographic sampling and DNA barcoding do not support the presence of Helobdella stagnalis (Linnaeus, 1758) (Clitellata: Glossiphoniidae) in North America

. Zootaxa, 4671(1), 1–25. https://doi.org/10.11646/zootaxa.4671.1.1