Buea bangem Mvogo Ndongo, von Rintelen, Tomedi-Tabi & Cumberlidge 2020, 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 bangem

description: Buea bangem Mvogo Ndongo, von Rintelen, Tomedi-Tabi & Cumberlidge n. sp.
(Figs. 2A, B, 3C, D, 4A, 5A, E, I, 6G–I, 7A–C, 8A, E)
Type material: Holotype adult male (CW 26.54 mm, CL 18.07 mm, CH 10.16 mm, FW 7.12 mm), Cameroon, Southwest region, Bangem, Bakossi National Park (05°01 ′ 25.5 ′′ N, 09°42 ′ 17.6 ′′ E), 1,253 m asl, 16 March 2017, coll. P. A. Mvogo Ndongo (ZMB Crust. 30325).
Paratypes: 5 adult males (CW 24.56 mm, CL 16.73 mm, CH 8.92 mm, FW 6.81 mm; CW 24.46 mm, CL 16.24 mm, CH 8.87 mm, FW 7.51 mm; CW 21.20 mm, CL 14.34 mm, CH 8.65 mm, FW 7.17 mm; CW 20.72 mm, CL 14.55 mm, CH 7.99, FW 6.14 mm; CW 20.05 mm, CL 13.82 mm, CH 7.78 mm, FW 6.00 mm) (IFAS-010); 2 subadult males (CW 18.60 mm, CL 13.27 mm, CH 7.23 mm, FW 5.42 mm; CW 16.74 mm, CL 12.43 mm, CH 6.51 mm, FW 5.09 mm), Cameroon, Southwest region, Bangem, Bakossi National Park (05°02 ′ 05.5 ′′ N, 09°41 ′ 57.9 ′′ E), 1,248 m asl, 15 March 2017, coll. P. A. Mvogo Ndongo (IFAS-011).
Diagnosis: Carapace height greatly exceeding FW (CH/FW 1.43, N = 8), anterior carapace surface with fields of granules, carinae; cervical, urogastric, cardiac, branchial grooves all distinct, shallow (Figs. 2A, 5E); carapace branchiostegal wall with distinct vertical (pleural) groove (Figs. 2B, 5A). Thoracic sternal sulcus S2/ S3 slightly arched (2B, 5I). Major cheliped dactylus stout, slightly arched, lined by small teeth, with large tooth in middle; major cheliped propodus inferior margin distinctly concave; pollex with 3 evenly-spaced large teeth (Fig. 3C). Lower margin of cheliped merus lined by pointed teeth, distal tooth jagged, largest (Figs. 2B, 6G, H). Terminal segment (TS) of mandibular palp bilobed, with large distinct anterior lobe (0.4× TS length) (Fig. 8A). G1 TA very long, equal to SS length (TA/SS 1.00) (Figs. 7A, B); G2 TA extremely short (TA/SS 0.12) (Fig. 7C).
Description: Carapace ovoid, height greatly exceeding FW (CH/ FW 1.43, N = 8), medium width (CW/FW 3.73, N = 8), surface texture granular; anterior corners of carapace each with field of carinae; cervical, urogastric, cardiac, branchial grooves all distinct, shallow (Figs. 2A, 5E). Postfrontal crest clearly defined, lateral ends meeting anterolateral margins at epibranchial teeth (Figs. 2A, 5A, E). Exorbital tooth small, low; intermediate, epibranchial teeth small, reduced to granule (Figs. 2A, 5A). Anterolateral margin behind epibranchial tooth granular (Figs. 2A, 5A). Carapace branchiostegite with longitudinal, vertical sutures dividing wall into suborbital, subhepatic, pterygostomial regions; vertical suture distinct, beginning behind epibranchial tooth (Figs. 2A, 5A). Mandibular palp 2-segmented; terminal segment (TS) bilobed, with large, distinct a`nterior lobe (0.4× TS length) (Fig. 8A). Third maxillipeds filling entire buccal cavern, except for transversely oval efferent respiratory openings in superior lateral corners, exopod lacking flagellum, ischium with distinct vertical sulcus (Fig. 8E). Sternal sulcus S2/S3, slightly arched, completely crossing sternum; S3/S4 incomplete, reduced to 2 small side notches (Figs. 2B, 5I); episternal sulci S4/E4, S5/E5, S6/E6 complete, S7/E7 missing (Figs. 2B, 5I).
Chelipeds of adult male greatly unequal (Figs. 2A, B, 3C, D). Fingers slim, elongated, major cheliped dactylus, stout, straight, with large pointed tooth in middle, propodus with large rectangular tooth on proximal part, large tooth distally, fingers enclosing oval interspace when closed (Fig. 3C). Minor cheliped with occluding margins of fingers lined by row of small teeth enclosing narrow oval interspace when closed (Fig. 3D). Cheliped carpus with 2 large pointed, unequal teeth, distal tooth broad, proximal tooth smaller (Fig. 6I). Lower margin of merus of major, minor chelipeds with large jagged blunt rectangular tooth followed by row of small stout teeth (Figs. 2B, 6G, H). Walking legs (pereiopods P2–P5) slender, posterior margins of propodi serrated with small pointed teeth, dactyli tapering, each bearing rows of downward-pointing large sharp spines
(Figs. 2A, B). Male pleon large, triangular, sides not indented, bordered by row of setae; telson (A7) large, with rounded distal margin (Figs. 2B, 5I). G1 TA very long, equal to SS length (TA/SS 1.0), proximal half straight, distal half directed outward ending in short tip, with long setae along ventral margins (Figs. 7A, B); G1 SS with long setae along proximal margins (Fig. 7A, B). G2 SS base broadened tapering to long thin process that supports G2; G2 TA extremely short (TA/SS 0.12), broadened, tip small (Fig. 7C).
Size: A small-size species, adult size range CW 20.1–26.5 mm.
Color in life: Dorsal carapace and appendages P2–P5 all dark brown; chelipeds (P1) red except for white tips (Fig. 4A).
Etymology: The species is named for Bangem, the closest town to the type locality in Bakossi National Park. The species epithet is a noun in apposition.
Habitat: Buea bangem n. sp. is found in rivers and streams in the Bakossi National Park (NP), Southwest Cameroon (Fig. 4B). This area covers a surface area of approximately 29,320 ha (293 km 2) that includes submontane and montane zones (between 900 m and 1,800 m asl).
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 290-291, DOI: 10.1093/jcbiol/ruaa019, http://zenodo.org/record/15084901