Sousa, S.C., Hernández-García, L.M. and Rousseau, G.X. 2020. A new species of Pontoscolex earthworm (Rhinodrilidae, Clitellata) from the Gurupi Biological Reserve, along with records of earthworm species from the Amazon region of Maranhão, Brazil. Zootaxa. 4801, 1 (Jun. 2020), 105–114. DOI:https://doi.org/10.11646/zootaxa.4801.1.4.