Key to the species of the genus Phallangothelphusa 1. Third maxilliped with ratio of the endopodal ischium and exopod lengths between 0.8 and 0.9........................ 2 - Third maxilliped with exopod as long as outer margin of endopodal ischium (Fig. 1E)................ P. zenuorum n. sp. 2. First gonopod with proximal projection of mesial process rectangular or square.................................... 3 - First gonopod with proximal projection of mesial process reduced and finger–like (Campos 2014: figs. 220A, E)................................................................................................ P. magdalenensis 3. First gonopod with end portion of distal projection of mesial process strongly recurved upwards (Campos 2014: figs. 218B–D).......................................................................................... P. juansei - First gonopod with end portion of distal projection of mesial process not recurved upwards........................... 4 4. First gonopod with lateral process of irregular form (Campos et al. 2019: figs. 2B–E....................... P. tangerina - First gonopod with lateral process near semicircular.......................................................... 5 5. First gonopod with angle of curvature between distal and proximal projections of mesial process near 60 o (Campos 2014: figs. 216B, E)...................................................................................... P. dispar - First gonopod with angle of curvature between distal and proximal projections of mesial process greater than 90 o (Campos 2014: figs. 222B, E).......................................................................... P. martensis

Published as part of Campos, Martha R. & Alexander, Moises, 2020, A new species of freshwater crab of the genus Phallangothelphusa Pretzmann 1965, from Colombia (Crustacea: Decapoda: Pseudothelphusidae), with a key to the species of the genus, pp. 364-370 in Zootaxa 4851 (2) on page 369, DOI: 10.11646/zootaxa.4851.2.9, http://zenodo.org/record/4407789