Phallangothelphusa, Pretzmann, 1965

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, Zootaxa 4851 (2), pp. 364-370 : 369

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

Figures

FIGURE 1. Phallangothelphusa zenuorum n. sp., male holotype (cl 16.3 mm, cb 28.0 mm),ICN-MHN-CR 3478. A,habitus, dorsal view; B, frontal view of carapace; C, chela of large cheliped, external view; D, opening of left efferent branchial channel, external view; E, left third maxilliped, external view.