taxonID	type	description	language	source
F7A19E547650576E997FBB44B56700A0.taxon	materials_examined	Material examined. 6 adult ♂ (CW 29.05 mm, CL 21.17 mm, CH 12.10 mm, FW 8.85 mm; CW 29.56 mm, CL 21.35 mm, CH 12.34 mm, FW 9.12 mm; CW 29.16 mm, CL 20.70 mm, CH 12.00 mm, FW 9.12 mm; CW 28.93 mm, CL 20.69 mm, CH 11.85 mm, FW 9.94 mm; CW 26.74 mm, CL 19.62 mm, CH 11.32 mm, FW 9.63 mm; CW 26.74 mm, CL 19.62 mm, CH 11.32 mm, FW 9.63 mm). 2 adult ♀ (CW 27.06 mm, CL 19.76 mm, CH 12.45 mm, FW 8.34 mm; CW 26.68 mm, CL 19.06 mm, CH 11.03 mm, FW 7.72 mm); Cameroon, Littoral region, Mount Nlonako Ecological Reserve (4.891820, 9.984830), 900 m a. s. l., 26 May 2018, coll. P. A. Mvogo Ndongo (ZMB Crust. 32428). 1 adult ♂ (CW 28.00 mm, CL 19.10 mm, CH 11.37 mm, FW 8.56 mm); 1 adult ♀ (CW 28.36 mm, CL 20.00 mm, CH 10.27 mm, FW 7.79 mm; Southwest Region, Mount Manengouba Ecological Reserve, small stream around the mountain (ZMB Crust. 30326) (5.034920, 9.836150), 1,958 m asl, 14 March 2017, coll. P. A. Mvogo Ndongo.	en	Ndongo, Pierre A. Mvogo, Rintelen, Thomas von, Cumberlidge, Neil (2021): A new species of the freshwater crab genus Potamonemus Cumberlidge & Clark, 1992 (Crustacea, Potamonautidae) endemic to the forested highlands of southwestern Cameroon, Central Africa. ZooKeys 1017: 127-141, DOI: http://dx.doi.org/10.3897/zookeys.1017.60990, URL: http://dx.doi.org/10.3897/zookeys.1017.60990
DD1BB93D70B75758AA2BFF9FE096C762.taxon	materials_examined	Other material. Bakossi National Park (Figs 1 c, 2 c, 3 c, 4 c, 5 e, f, j, 6 g-i, 7 c, g). 1 adult ♂ (CW 30.41 mm, CL 20.57 mm, CH 12.50 mm, FW 9.32 mm), 1 adult ♀ (CW 27.48 mm, CL 20.06 mm, CH 11.31 mm, FW 8.19 mm), Cameroon, Southwest Region, Bakossi National Park (5.031083, 9.687528), 1,253 m a. s. l., 15 March 2017, coll. P. A. Mvogo Ndongo (ZMB Crust. 30328). 5 adult ♂ (CW 27.61 mm, CL 19.37 mm, CH 11.39 mm, FW 8.65 mm; CW 26.54 mm, CL 19.09 mm, CH 10.80 mm, FW 9.13 mm; CW 25.55 mm, CL 18.68 mm, CH 10.58 mm, FW 8.41 mm; CW 25.3 mm, CL 18.05 mm, CH 10.70, FW 8.41 mm) (IFAS- 014); 2 subadult ♂ (CW 22.17 mm, CL 15.76 mm, CH 9.04 mm, FW 7.35 mm; CW 22.02 mm, CL 15.67 mm, CH 9.06 mm, FW 7.49 mm; CW 22.04 mm, CL 16.00 mm, CH 9.22 mm, FW 7.65 mm; CW 21.35 mm, CL 15.19 mm, CH 8.76 mm, FW 6.81 mm), Cameroon, Southwest Region, Bakossi National Park (5.031083, 9.687528), 1,248 m a. s. l., 15 March 2017, coll. P. A. Mvogo Ndongo (IFAS- 015). 2 subadult ♀ (CW 23.76 mm, CL 17.57 mm, CH 9.88 mm, FW 7.68 mm; CW 23.31 mm, CL 16.63 mm, CH 9.08 mm, FW 7.59 mm), Cameroon, Southwest Region, Bakossi National Park (05.031083, 9.687528), 1,248 m a. s. l., 15 March 2017, coll. P. A. Mvogo Ndongo (IFAS- 016).	en	Ndongo, Pierre A. Mvogo, Rintelen, Thomas von, Cumberlidge, Neil (2021): A new species of the freshwater crab genus Potamonemus Cumberlidge & Clark, 1992 (Crustacea, Potamonautidae) endemic to the forested highlands of southwestern Cameroon, Central Africa. ZooKeys 1017: 127-141, DOI: http://dx.doi.org/10.3897/zookeys.1017.60990, URL: http://dx.doi.org/10.3897/zookeys.1017.60990
DD1BB93D70B75758AA2BFF9FE096C762.taxon	diagnosis	Diagnosis. Carapace anterior surface smooth except for faint urogastric groove (Fig. 1 d). Broad epimeral (longitudinal) suture on carapace sidewall (branchiostegite) dividing carapace sidewall into 2 regions, vertical (pleural) groove lacking (Fig. 1 d). Outer lower margin of cheliped merus lined by small, blunt teeth, inner lower margin smooth, distal meral tooth distinct, pointed (Fig. 3 d). Major chela dactylus straight (not arched) (Fig. 5 g). Sternal sulcus S 2 / S 3 completely traversing sternum; S 3 / S 4 incomplete, reduced to 2 short, distinct notches on each side of sternum (Fig. 3 d). G 1 with long TA (TA / SS 0.66), slim, curving outward, lacking marginal setae, tapering to pointed tip; G 2 TA remarkably short (TA / SS 0.13) (Fig. 6 j, l). A small species, mature between CWs 20 - 25 mm.	en	Ndongo, Pierre A. Mvogo, Rintelen, Thomas von, Cumberlidge, Neil (2021): A new species of the freshwater crab genus Potamonemus Cumberlidge & Clark, 1992 (Crustacea, Potamonautidae) endemic to the forested highlands of southwestern Cameroon, Central Africa. ZooKeys 1017: 127-141, DOI: http://dx.doi.org/10.3897/zookeys.1017.60990, URL: http://dx.doi.org/10.3897/zookeys.1017.60990
DD1BB93D70B75758AA2BFF9FE096C762.taxon	description	Description. Carapace ovoid, medium height (CH / FW 1.17), wide (CW / FW 3.19); carapace surface smooth; postfrontal crest distinct, completely traversing carapace, lateral ends meeting anterolateral margins (Fig. 1 d); exorbital tooth low, distinct; intermediate, epibranchial teeth each reduced to small granule (Fig. 4 d); anterolateral margin behind epibranchial tooth smooth (Fig. 4 d). Carapace branchiostegite with prominent epimeral suture dividing wall into subhepatic / suborbital, pterygostomial regions; vertical (pleural) suture faint (Fig. 3 d). Sternal sulcus S 2 / S 3 deep, completely traversing sternum; S 3 / S 4 incomplete, reduced to 2 short, distinct notches on each side of sternum (Fig. 3 d); margins of S 3, S 4 raised, broad (Fig. 3 d); episternal sulci S 4 / E 4, S 5 / E 5, S 6 / E 6 faint or missing, S 7 / E 7 complete (Fig. 3 d). Mandibular palp 2 - segmented; medium-sized anterior lobe at junction between segment (0.25 x TS length; Fig. 7 h). Third maxillipeds filling entire buccal cavern, except for transversely oval, efferent respiratory openings in superior lateral corners; ischium smooth, lacking vertical groove; exopod lacking flagellum (Fig. 7 d). Male chelipeds greatly unequal, right cheliped larger than left (Figs 1 d, 5 g, h). Movable finger (dactylus), fixed finger (pollex of propodus) of right (major) chela both slim, elongated; fixed finger with 3 large pointed teeth (2 proximal, 1 distal); movable finger relatively stout, straight (not highly arched), with 4 small but distinct teeth (2 proximal, 2 distal; Fig. 5 g). Left (minor) chela dactylus, propodus smaller than right chela, with small teeth on occluding margins (Fig. 5 h). Inner inferior margin of cheliped merus lined by small teeth, outer inferior margin smooth; distal meral tooth large, pointed (Fig. 5 d). Cheliped carpus inner margin with large pointed distal tooth; proximal tooth much smaller, followed by granule (Fig. 5 l). Ambulatory legs (P 2 - 5) slender, P 4 longest, P 5 shortest; dactyli P 2 - 5 tapering to point, each bearing rows of downward-pointing sharp bristles, P 5 dactylus shortest (Fig. 1 d). Male pleon triangular, margins not indented and lacking setae (Fig. 3 d). G 1 with long TA (TA / SS 0.66), slim, curving outward, lacking marginal setae, tapering to pointed tip; G 2 TA remarkably short (TA / SS 0.13) (Fig. 6 j, l); G 1 SS, broad in basal, midsection, distal quarter tapering sharply, narrow at junction with G 1 TA (Fig. 6 j, l). G 2 TA extremely short (G 2 TA / SS 0.3; Fig. 6 k). Adult female. Right and left chelipeds subequal. Fixed, movable fingers of chela interspersed with series of smaller acute teeth along their length. Pleon wide, covering entire sternum, reaching bases of coxae of P 2 - 5; pleon with 6 free pleomeres (A 1 - 6) becoming gradually wider proximally, telson wide, forming near semicircle. Size. Small species, CW in mature individuals ranging from 20.0 - 30.4 mm. Colour in life. Dorsal carapace and all ambulatory legs dark brown, chelipeds red.	en	Ndongo, Pierre A. Mvogo, Rintelen, Thomas von, Cumberlidge, Neil (2021): A new species of the freshwater crab genus Potamonemus Cumberlidge & Clark, 1992 (Crustacea, Potamonautidae) endemic to the forested highlands of southwestern Cameroon, Central Africa. ZooKeys 1017: 127-141, DOI: http://dx.doi.org/10.3897/zookeys.1017.60990, URL: http://dx.doi.org/10.3897/zookeys.1017.60990
DD1BB93D70B75758AA2BFF9FE096C762.taxon	etymology	Etymology. The species is named for Man Lake, one of a pair of small lakes in the caldera at the summit of Mount Manengouba (the other lake being Woman Lake). The species epithet is used as a noun in apposition.	en	Ndongo, Pierre A. Mvogo, Rintelen, Thomas von, Cumberlidge, Neil (2021): A new species of the freshwater crab genus Potamonemus Cumberlidge & Clark, 1992 (Crustacea, Potamonautidae) endemic to the forested highlands of southwestern Cameroon, Central Africa. ZooKeys 1017: 127-141, DOI: http://dx.doi.org/10.3897/zookeys.1017.60990, URL: http://dx.doi.org/10.3897/zookeys.1017.60990
DD1BB93D70B75758AA2BFF9FE096C762.taxon	conservation	Conservation. Potamonemus man sp. nov. is found in an area of great conservation interest. The aquatic habitats of this species in the Mount Manengouba Ecological Reserve and in the Bakossi National Park are both in montane tropical rainforest in the Cameroon highlands, an area with a high biodiversity and a high rate of endemism, including freshwater crabs (Cumberlidge et al. 2019; Mvogo Ndongo et al. 2017 a, d, c, 2018, 2019, 2020). In Mount Manengouba Ecological Reserve the small, forested stream near Man Lake where P. man sp. nov. lives also supports a sympatric population of the endangered freshwater crab Louisea balssi (Bott, 1959). Significantly, there are no reports of any species of invertebrates (molluscs, insects, crustaceans) or vertebrates (fish, amphibians, snakes, and birds) from Man Lake itself. This inhospitality to life may be related to the unusual green colour of its waters which may be due to the accumulation of lethal compounds, which may also be a potential danger to humans (see Mvogo Ndongo et al. 2018). Both the Mount Manengouba Ecological Reserve and the Bakossi National Park are under increasing pressure from growing nearby human populations and from the associated clearance of land for agriculture. As a result, despite being found in protected areas, the habitat of P. man sp. nov. is increasingly threatened by nearby intensive agricultural practices and forest destruction for firewood collection. In addition, the farmers encroaching on these habitats use agrochemicals and pesticides on their crops, and these pollutants eventually drain into the aquatic systems, potentially poisoning the freshwater communities (Mvogo Ndongo et al. 2018).	en	Ndongo, Pierre A. Mvogo, Rintelen, Thomas von, Cumberlidge, Neil (2021): A new species of the freshwater crab genus Potamonemus Cumberlidge & Clark, 1992 (Crustacea, Potamonautidae) endemic to the forested highlands of southwestern Cameroon, Central Africa. ZooKeys 1017: 127-141, DOI: http://dx.doi.org/10.3897/zookeys.1017.60990, URL: http://dx.doi.org/10.3897/zookeys.1017.60990
