Csuzdi, Csaba, Chang, C-H., Pavlicek, T., Szederjesi, Tímea, Esopi, D. (2017) Molecular Phylogeny and Systematics of Native North American Lumbricid Earthworms (Clitellata: Megadrili) PLOS ONE. e0181504. ISSN 1932-6203