Verhoeff, K. W. (1926). Über einige von Dr. I. Buresch in Bulgarien gesammelte Diplopoden. 2. Aufsatz. Mitteilungen der Bulgarischen Entomologischen Gesellschaft, 3: 193-210, available online athttps://archive.org/details/rcin.org.pl.WA488_190042_19746_s1334_156842/mode/2up, https://www.biodiversitylibrary.org/page/40152035 page(s): 195; note: An entirely black specimen found together with "normal" G. norica was described as a variety by Verhoeff. Important to note that only the one black male, not the other Bulgarian specimens, were viewed...
An entirely black specimen found together with "normal" G. norica was described as a variety by Verhoeff. Important to note that only the one black male, not the other Bulgarian specimens, were viewed as G. norica var. vodnatensis
original descriptionVerhoeff, K. W. (1926). Über einige von Dr. I. Buresch in Bulgarien gesammelte Diplopoden. 2. Aufsatz. Mitteilungen der Bulgarischen Entomologischen Gesellschaft, 3: 193-210, available online athttps://archive.org/details/rcin.org.pl.WA488_190042_19746_s1334_156842/mode/2up, https://www.biodiversitylibrary.org/page/40152035 page(s): 195; note: An entirely black specimen found together with "normal" G. norica was described as a variety by Verhoeff. Important to note that only the one black male, not the other Bulgarian specimens, were viewed...
An entirely black specimen found together with "normal" G. norica was described as a variety by Verhoeff. Important to note that only the one black male, not the other Bulgarian specimens, were viewed as G. norica var. vodnatensis