"Litman et al. (2021)" . "2021"^^ . "Litman J. R., Fateryga A. W., Griswold T. L., Aubert M., Proshchalykin M. Y., Le Divelec R., Burrows S., Praz C.J., 2021. Paraphyly and low levels of genetic divergence in morphologically distinct taxa: revision of the Pseudoanthidium scapulare complex of carder bees (Apoidea: Megachilidae: Anthidiini). Zoological Journal of the Linnean Society, XX : 1-51." . . "Litman et al. (2021)" . . . "2021"^^ .