Buea mundemba Mvogo Ndongo, von Rintelen, n. sp.
Creators: name: Mvogo Ndongo, Pierre A
name: von Rintelen, Thomas
name: Tomedi-Tabi Eyango, Minette
name: Cumberlidge, Neil
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Potamonautidae
Buea
Buea mundemba

description: Buea mundemba Mvogo Ndongo, von Rintelen &
Cumberlidge n. sp.
(Figs. 2C, D, 3E, F, 4C, 5B, F, J, 6C, D, K, 7D–F, 8B, F)
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, 5F); carapace branchiostegal wall with distinct vertical (pleural) groove (Figs. 2C, 5B). Sternal sulcus S2/S3 completely crossing sternum, slightly arched (Figs. 2D, 5J). 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). Lower margin of cheliped merus lined by blunt small teeth, distal tooth largest (sharp spine) (Figs. 2D, 6C, D). Terminal segment (TS) of mandibular palp bilobed, with small distinct anterior lobe (0.25× TS length) (Fig. 8B). G1 TA extremely long, almost as long as SS (TA/SS 0.98) (Figs.7D, E); G2 TA extremely short (TA/SS 0.20) (Fig. 7F). 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).
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, 5F); postfrontal crest distinct, complete, lateral ends meeting anterolateral margins (Figs. 2C, 5B, F); exorbital angle low, blunt, intermediate, epibranchial teeth each reduced to small granule (Figs. 5B); anterolateral margin behind epibranchial tooth granular (Figs. 2C, 5B). 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, 5B). Sternal sulcus S2/S3 completely crossing sternum, slightly arched; S3/S4 incomplete, reduced to 2 small side notches (Figs. 2D, 5J). Episternal sulci S4/E4, S5/E5, S6/E6 complete, S7/E7 missing (Figs. 2D, 5J).
Mandibular palp 2-segmented, terminal segment (TS) bilobed, with small distinct anterior lobe (0.25× TS length) (Fig. 8B). Third maxillipeds filling entire buccal cavern, except for transversely oval efferent respiratory openings in superior lateral corners (Fig. 8F); exopod lacking flagellum; ischium with distinct vertical sulcus (Fig. 8F).
Chelipeds of adult male greatly unequal (Figs. 2C, D, 3E, F). Fingers slim, elongated; movable finger (dactylus) arched, with large tooth, enclosing oval interspace when closed (Fig. 3E); pollex of fixed finger (propodus) with 3 jagged, large teeth proximally, 2 distinct teeth distally interspersed by row of small teeth (Fig. 3E). Minor cheliped with occluding margins of each finger lined by row of small teeth, enclosing oval interspace when closed (Fig. 3F). Cheliped carpus with 2 large, unequal teeth, distal tooth bigger than proximal tooth (Figs. 2C, 6K). 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, 6C, D). 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).
Male pleon triangular, sides not indented, telson (A7) rounded at distal margin (Figs. 2D, 5J). G1 TA extremely long, almost as long as SS (TA/SS 0.98), tip long (Figs. 7D, E), G1 TA proximal half straight, distal half directed outward ending in long tip with long setae along ventral margin (Figs. 7D, E). G1 SS slightly longer than TA with long marginal setae (Figs. 7D, E). 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).
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).
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).
Nomenclatural statement: A life science identifier (LSID) number was obtained for the new species: urn:lsid:zoobank. org:pub:399269F4-4FA2-4858-ADE0-C281CBF79278.
description: Published as part of Mvogo Ndongo, Pierre A, von Rintelen, Thomas, Tomedi-Tabi Eyango, Minette & Cumberlidge, Neil, 2020, Morphological and molecular analyses reveal three new endemic species of the freshwater crab genus Buea Cumberlidge, Mvogo Ndongo, Clark & amp; Daniels, 2019 (Crustacea: Brachyura: Potamonautidae) from a rainforest biodiversity hotspot in Cameroon, Central Africa, pp. 288-300 in Journal of Crustacean Biology 40 (3) on pages 291-293, DOI: 10.1093/jcbiol/ruaa019, http://zenodo.org/record/15084901