Cipola, Nikolas G., and Aron D. Katz. 2021. “Morphological and Molecular Analysis of Willowsia Nigromaculata (Collembola, Entomobryidae, Entomobryinae) Reveals a New Cryptic Species from the United States”. European Journal of Taxonomy 739 (1):92-116. https://doi.org/10.5852/ejt.2021.739.1269.