Terrathelphusa kundong , Grinang, Jongkar & Ng, Peter K. L., 2015

Grinang, Jongkar & Ng, Peter K. L., 2015, The identity of the semiterrestrial crab Terrathelphusa kuchingensis (Nobili, 1901) (Crustacea: Decapoda: Brachyura: Gecarcinucidae), with descriptions of four new species from southwestern Sa, Zootaxa 3946 (3), pp. 331-346: 338-340

publication ID

http://dx.doi.org/10.11646/zootaxa.3946.3.2

publication LSID

lsid:zoobank.org:pub:24E2F41D-89BF-473F-ACE0-ED951BCB2699

persistent identifier

http://treatment.plazi.org/id/03DF87F3-FFCF-6E77-FF4F-FABAD15E2F20

treatment provided by

Plazi

scientific name

Terrathelphusa kundong
status

n. sp.

Terrathelphusa kundong  n. sp.

( Figs. 7View FIGURE 7 A –H, 8 A –E, 11 G, H)

Terrathelphusa  kuchingensis— Ng & Grinang 2004: 314 (part), fig. 7 (not Potamon (Geothelphusa) kuchingensis Nobili, 1901  ).

Material examined. Holotype: male (29.4 × 21.9 mm) ( ZRCAbout ZRC 2015.0004), middle elevation of Gunung Serambu, Bau, Sarawak, 1 O 25 ’ 50.4 ”N 110 O 13 ’04.3”E, 340 m asl, coll. J. Grinang et al., 24 April 2013. Paratype: 2 females (larger 30.8 × 23.0 mm) (SBC.C.00364– 65), data same as holotype; 1 female (34.9 × 25.3 mm) (SBC.C.00366), flat bank of Sungai Bukan Kagap, base of Gunung Serambu at Podam area, Bau, Sarawak, 1 O 25 ’ 38.4 ”N 110 O 12 ’ 29.4 ”E, 34 m asl, coll. J. Grinang et al., 13 March 2013; 3 males (largest 36.2 × 25.3 mm), 2 females (larger 30.0 × 22.0 mm) (SBC.C.00367– 71), foothill of Gunung Sewa, Giam area, Padawan-Penrissen limestone formation, Sarawak, 1 O 19 ’01.2”N 110 O 16 ’ 22.2 ”E, 49 m asl, coll. J. Grinang et al., 21 September 2013; 1 female (36.3 × 24.8 mm) (SBC.C.0072), secondary forest, sandstone, Bung Bratak, Bau, Sarawak, 1 O 28 ’ 17.4 ”N 110 O05’ 13.5 ”E, 100 m asl, coll. S.T. Pang et al., 1 December 2013; 1 female (24.6 × 17.7 mm) (SBC.C.00373), foothill of Gunung Sewa, Giam area, Padawan-Penrissen limestone formation, Sarawak, coll. Anang et al., 22 August 2008; 2 males, 1 female ( ZRCAbout ZRC 2014.0843), forest next to rubber and cocoa plantations, base of Gunung Sewa, Giam area, Padawan-Penrissen limestone formation, Sarawak, coll. J. Grinang et al., 14 September 2013; 1 female (SBC.C.00014), Bau limestone formation, Gunung Tai Ton, Bau, Sarawak, coll. J. Grinang et al., 13 November 2001; 1 female (SBC.C.00015), Bau limestone formation, Gunung Tai Ton, Bau, Sarawak, coll. A. Denis et al., 13 November 2001; 1 female (SBC.C.00049), Bau limestone formation, Gunung Tai Ton, Bau, Sarawak, coll. J.

Grinang et al., 14 April 2002; 1 female (21.6 × 16.2 mm) ( ZRCAbout ZRC), Bau limestone formation, Gunung Aup, Bau, Sarawak, coll. J. Grinang et al., 14 May 2002 (det. as Terrathelphusa kuchingensis  by Ng & Grinang, 2004); 2 females (larger 30.8 × 22.1 mm) (SM Cru. 1986.144 – 145), Bidi, Bau, Sarawak, coll. C. J. Brooke, June 1903 (det. as Terrathelphusa kuchingensis  ).

Diagnosis. Carapace broader than long, conspicuously swollen, surface convex, smooth; cervical grooves broad, deep; epigastric cristae high, separated by deep epigastric groove; H-groove deep, long almost confluent with cervical grooves; epibranchial tooth indistinct but can be separated from external orbital angle by notch, anterolateral, frontal regions appearing compressed, supraorbital margin almost parallel with frontal margin; epistome median lobe blunt to bifurcated ( Fig. 7View FIGURE 7 A –C). Male abdomen with elongated somite 6, lateral margins gently concave ( Fig. 7View FIGURE 7 D). Third maxilliped ischium rectangular, about 1.9 times maximum width ( Fig. 7View FIGURE 7 E). Ambulatory legs smooth, relatively slender, second pair longest; length of fourth merus about 3.8 times width ( Fig. 7View FIGURE 7 F). Cheliped carpus rugose, without granules ( Fig. 7View FIGURE 7 G, H), inner angle with broadly triangular tooth; gap between fingers of major chela wide ( Fig. 7View FIGURE 7 A). G 1 gently curving outwards; terminal segment cone-shaped, tapered, gently curving upwards, about 0.3 times length of subterminal segment ( Fig. 8View FIGURE 8 A, B, D, E). Distal segment of G 2 relatively long, about 0.6 times length of basal segment ( Fig. 8View FIGURE 8 C).

Life colour. Carapace is grape-purple with whitish cream legs and chelipeds ( Fig. 11View FIGURE 11 G –H).

Variation. The paratypes agree well with the holotype male except in some non-sexual characters: the tip of the median lobe of the epistome varies from blunt to bifurcated that was not determined by size or sex. The cervical grooves are proportionately broader and the ambulatory legs relatively longer in larger specimens.

Habitat. Widely distributed in limestone and sandstone outcrops, from lowlands to mid- elevations of mountains. The burrows are shallower in sandstone possibly because of the compact soil, whereas burrows are deeper (approximately more than 1 m) in the loose soil at the base of limestone hills.

Etymology. The name is derived from the Iban word kundong  alluding to the dark crimson carapace that is very similar to the ripe fruit of a plant of the same name ( Garcinia parvifolia  ). The name is used as a noun in apposition.

Remarks. Terrathelphusa kundong  n. sp., can be distinguished from T. kuchingensis  and the other new species being described herein by a combination of characters: inner angle of carpus with broadly triangular tooth ( Fig. 7View FIGURE 7 A) (acutely triangular tooth in other species; Figs. 1View FIGURE 1 A, 3 A, 5 A, 9 A) and the G 1 terminal segment distinctly curving upwards ( Fig. 8View FIGURE 8 A, B, C, D) (gently curving upwards in other species; Figs. 2View FIGURE 2 A, B, D, E; 4 A, B, D, E; 6 A, B, D, E; 8 A, B, D, E; 10 A, B, D, E). Examination of the specimens previously identified as T. kuchingensis  in the Sarawak Museum and Sarawak Biodiversity Centre from areas adjacent to the type locality show that they should be transferred to T. kundong  n. sp., instead.

ZRC

Zoological Reference Collection, National University of Singapore