Buea mundemba Mvogo Ndongo, von Rintelen

Buea mundemba Mvogo Ndongo, von Rintelen View in CoL & Cumberlidge n. sp.

( Figs. 2C, D View Figure 2 , 3E, F View Figure 3 , 4C View Figure 4 , 5B, F, J View Figure 5 , 6C, D, K View Figure 6 , 7D–F View Figure 7 , 8B, F View Figure 8 )

Type material: Holotype, adult male (CW 26.15 mm, CL 17.60 mm, CH 10.26 mm, FW 7.04 mm), Cameroon, Southwest region, Korup National Park (05°0136.2”N, 08°52 ′ 18.5 ′′ E), 300 m asl, 12 April 2017, coll. P. A. Mvogo Ndongo (ZMB Crust. 30321).

Paratypes: 6 adult males (CW 30 mm, CL 20.16 mm, CH 11.42 mm, FW 8.31 mm; CW 25 mm, CL 17.52 mm, CH 9.83 mm, FW 6.72 mm; CW 23.41 mm, CL 16.54 mm, CH 9.00 mm, FW 6.62 mm; CW 23.52 mm, CL 16.68 mm, CH 8.04 mm, FW 6.66 mm; CW 23.53 mm, CL 16.65 mm, CH 9.10 mm, FW 6.73 mm; CW 23.91 mm, CL 16.86 mm, CH 9.20 mm, FW 6.57 mm; CW 24.39 mm, CL 16.95 mm, CH 9.68 mm, FW 7.35 mm), same data as holotype (ZMB Crust. 30322); 3 subadult males (CW 20.77, CL 14.72, CH 8.47, FW 5.70 mm; CW 21.04 mm, CL 14.77 mm, CH 8.80 mm, FW 6.41 mm; CW 18.26 mm, CL 13.23 mm, CH 6.91 mm, FW 5.60 mm), Southwest region, Korup National Park (05°01 ′ 36.2 ′′ N, 08°52 ′ 18.5 ′′ E; 05°02 ′ 17.6 ′′ N, 08°52 ′ 36.3 ′′ E), 300 m asl, 12 April 2017, coll. P. A. Mvogo Ndongo (IFAS-007); 2 juvenile males (CW 13.31 mm, CL 9.44 mm, CH 5.10 mm, FW 4.51 mm; CW 10.90 mm, CL 11.11 mm, CH 5.91 mm, FW 3.80 mm); 3 adult females (CW 28.24 mm, CL 19.34 mm, CH 10.34 mm, FW 8.07 mm; CW 24.03 mm, CL 16.38 mm, CH 9.59 mm, FW 7.77 mm; CW 23.49 mm, CL 16.71 mm, CH 9.28 mm, FW 6.95 mm) Southwest region, Korup National Park (05°01 ′ 36.2 ′′ N, 08°52 ′ 18.5 ′′ E; 05°02 ′ 17.6 ′′ N, 08°52 ′ 36.3 ′′ E), 300 m asl, 12 April. 2017, coll. P. A. Mvogo Ndongo (IFAS-008); 4 subadult females (CW 17.03 mm, CL 12.24 mm, CH 6.56 mm, FW 5.57 mm; CW 15.81 mm, CL 11.67 mm, CH 5.96 mm, FW 4.86 mm; CW 15.58 mm, CL 11.59 mm, CH 5.95 mm, FW 4.86 mm; CW 18.38 mm, CL 12.70 mm, CH 7.06 mm, FW 5.50 mm), Southwest region, Korup National Park (05°01 ′ 36.2 ′′ N, 08°52 ′ 18.5 ′′ E; 05°02 ′ 17.6 ′′ N, 08°52 ′ 36.3 ′′ E), 300 m asl, 12 April 2017, coll. P. A. Mvogo Ndongo (IFAS-009).

Diagnosis: Carapace highly arched (CH/FW 1.45, N = 20), anterior carapace surface with fields of granules and carinae; cervical, urogastric, cardiac, branchial grooves all distinct, but shallow ( Figs. 2C View Figure 2 , 5F View Figure 5 ); carapace branchiostegal wall with distinct vertical (pleural) groove ( Figs. 2C View Figure 2 , 5B View Figure 5 ). Sternal sulcus S2/S3 completely crossing sternum, slightly arched ( Figs. 2D View Figure 2 , 5J View Figure 5 ). Major cheliped dactylus stout, arched, lined by small teeth, largest pointed tooth in middle, propodus with large (molar) tricuspid tooth proximally, followed by smaller teeth interspersed by 4 larger teeth ( Fig. 3E View Figure 3 ). Lower margin of cheliped merus lined by blunt small teeth, distal tooth largest (sharp spine) ( Figs. 2D View Figure 2 , 6C, D View Figure 6 ). Terminal segment (TS) of mandibular palp bilobed, with small distinct anterior lobe (0.25× TS length) ( Fig. 8B View Figure 8 ). G1 TA extremely long, almost as long as SS (TA/SS 0.98) ( Figs.7D, E View Figure 7 ); G2 TA extremely short (TA/SS 0.20) ( Fig. 7F View Figure 7 ). Major cheliped propodus inferior margin straight or only slightly indented; pollex with large molar proximally, followed by 4 distinct teeth interspersed by smaller teeth ( Fig. 3E View Figure 3 ).

Description: Carapace ovoid, high (CH/FW 1.45, N = 20), very wide (CW/FW 3.72, N = 20), surface slightly granular, anterior corners of carapace each with field of carinae; cervical, urogastric, cardiac, branchial grooves all distinct, shallow, intestinal groove faint ( Figs. 2C View Figure 2 , 5F View Figure 5 ); postfrontal crest distinct, complete, lateral ends meeting anterolateral margins ( Figs. 2C View Figure 2 , 5B, F View Figure 5 ); exorbital angle low, blunt, intermediate, epibranchial teeth each reduced to small granule ( Figs. 5B View Figure 5 ); anterolateral margin behind epibranchial tooth granular ( Figs. 2C View Figure 2 , 5B View Figure 5 ). Carapace branchiostegite with distinct vertical (pleural) groove with longitudinal, vertical suture dividing wall into suborbital, subhepatic, pterygostomial regions,

vertical suture beginning on posterior margin of epibranchial tooth ( Figs. 2D View Figure 2 , 5B View Figure 5 ). Sternal sulcus S2/S3 completely crossing sternum, slightly arched; S3/S4 incomplete, reduced to 2 small side notches ( Figs. 2D View Figure 2 , 5J View Figure 5 ). Episternal sulci S4/E4, S5/E5, S6/E6 complete, S7/E7 missing ( Figs. 2D View Figure 2 , 5J View Figure 5 ).

Mandibular palp 2-segmented, terminal segment (TS) bilobed, with small distinct anterior lobe (0.25× TS length) ( Fig. 8B View Figure 8 ). Third maxillipeds filling entire buccal cavern, except for transversely oval efferent respiratory openings in superior lateral corners ( Fig. 8F View Figure 8 ); exopod lacking flagellum; ischium with distinct vertical sulcus ( Fig. 8F View Figure 8 ).

Chelipeds of adult male greatly unequal ( Figs. 2C, D View Figure 2 , 3E, F View Figure 3 ). Fingers slim, elongated; movable finger (dactylus) arched, with large tooth, enclosing oval interspace when closed ( Fig. 3E View Figure 3 ); pollex of fixed finger (propodus) with 3 jagged, large teeth proximally, 2 distinct teeth distally interspersed by row of small teeth ( Fig. 3E View Figure 3 ). Minor cheliped with occluding margins of each finger lined by row of small teeth, enclosing oval interspace when closed ( Fig. 3F View Figure 3 ). Cheliped carpus with 2 large, unequal teeth, distal tooth bigger than proximal tooth ( Figs. 2C View Figure 2 , 6K View Figure 6 ). Medial inferior margin of merus of right, left chelipeds identical, both with large tooth onethird from distal margin followed by row of small teeth ( Figs. 2D View Figure 2 , 6C, D View Figure 6 ). Walking legs (pereiopods P2–P5) moderately slender, posterior margins of propodi serrated with small, blunt teeth, dactyli tapering, each bearing rows of downward-pointing large sharp spines ( Figs. 2C, D View Figure 2 ).

Male pleon triangular, sides not indented, telson (A7) rounded at distal margin ( Figs. 2D View Figure 2 , 5J View Figure 5 ). G1 TA extremely long, almost as long as SS (TA/SS 0.98), tip long ( Figs. 7D, E View Figure 7 ), G1 TA proximal half straight, distal half directed outward ending in long tip with long setae along ventral margin ( Figs. 7D, E View Figure 7 ). G1 SS slightly longer than TA with long marginal setae ( Figs. 7D, E View Figure 7 ). G2 SS robust at base, longer than G1 SS, reaching middle of G1 TA; G2 TA extremely short (TA/SS 0.20), broadened, tip short ( Fig. 7F View Figure 7 ).

Size: A small-size species, adult size range CW 23.4–30 mm.

Color in life: Dorsal carapace and pereiopods P1–P5 all dark purple/brown ( Fig. 4C View Figure 4 ).

Etymology: The species is named for Mundemba, the closest town to the type locality in Korup National Park, Cameroon. The species epithet is a noun in apposition.

Habitat: Buea mundemba n. sp. is found in rivers and streams in Korup National Park in Southwest Cameroon (8°42 ′ N to 9°16 ′ E) that comprises more than 1,260 km 2 of closed canopy lowland primary forest ( Fig. 4D View Figure 4 ).

Nomenclatural statement: A life science identifier (LSID) number was obtained for the new species: urn:lsid:zoobank. org:pub:399269F4-4FA2-4858-ADE0-C281CBF79278.