taxonID	type	description	language	source
E3508794B30DB92BAEC841DCFA84FDD0.taxon	materials_examined	Type species. Leelumnus radium sp. nov., by present designation.	en	Mendoza, Jose Christopher E., Ng, Peter K. L. (2011): Leelumnus radium, a new genus and species of pilumnid crab from marine encrusting communities in Singapore (Crustacea: Decapoda: Brachyura: Pilumnidae). Zootaxa 2809: 58-66, DOI: 10.5281/zenodo.201036
E3508794B30DB92BAEC841DCFA84FDD0.taxon	diagnosis	Diagnosis. Carapace transversely subhexagonal, broader than long; regions poorly defined; dorsal surface convex, smooth, sparsely setose. Front moderately projecting, bilobed; anterior margins gently concave, granulate, mesial angles more advanced than lateral, no lateral lobule visible. Fronto-orbital margin, epistome and buccal field relatively narrow transversely; fronto-orbital width about 0.4 times maximum carapace width. Orbits relatively short, rounded; eyes with short ocular peduncle. Anterolateral margin granulate; divided into 4 teeth; first tooth smallest, connected to exorbital angle by broad, horizontal, granulate crest; subsequent teeth projecting laterally, curving anteriorly, second tooth broadly triangular, third and fourth teeth narrower, acute. Chelipeds distinctly unequal, external surface of male major chela smooth, glabrous. Ambulatory legs smooth, without granules on margins of all articles; densely setose on carpi, propodi and dactyli. Male thoracic sternum and abdomen relatively broad; male telson triangular. G 1 slender, slightly sinuous; distal tip flared / widened, flattened, covered with several simple, stiff, spiniform setae.	en	Mendoza, Jose Christopher E., Ng, Peter K. L. (2011): Leelumnus radium, a new genus and species of pilumnid crab from marine encrusting communities in Singapore (Crustacea: Decapoda: Brachyura: Pilumnidae). Zootaxa 2809: 58-66, DOI: 10.5281/zenodo.201036
E3508794B30DB92BAEC841DCFA84FDD0.taxon	etymology	Etymology. The new genus is named in honor of Dr Lee Seng Tee. Through the Lee Foundation, he has been instrumental in helping the Raffles Museum and the National University of Singapore build a new natural history museum for the country. The genus name is formed by an arbitrary combination of his family name Lee and Pilumnus. Gender masculine.	en	Mendoza, Jose Christopher E., Ng, Peter K. L. (2011): Leelumnus radium, a new genus and species of pilumnid crab from marine encrusting communities in Singapore (Crustacea: Decapoda: Brachyura: Pilumnidae). Zootaxa 2809: 58-66, DOI: 10.5281/zenodo.201036
E3508794B30DB92BAEC841DCFA84FDD0.taxon	discussion	Remarks. Although there is general consensus that the Pilumnoidea is a monophyletic entity (Ng et al. 2008), the classification of the various families is not satisfactory. On the basis of the carapace and general features, Leelumnus gen. nov. is best classified in the Pilumnidae Samouelle, 1819, primarily due to the presence of complete, well-defined longitudinal ridges on the endostome (endostomial crests), a relatively broader male abdomen with a semicircular telson, the G 1 being long and sinuous, and the G 2 is very short and sigmoid in shape (Ng 1998; Davie 2002; Ng et al. 2008). Leelumnus gen. nov. is superficially similar to Latopilumnus Türkay & Schuhmacher, 1985, and Aniptumnus Ng, 2002, in the following features: 1) the general form of the carapace, which is transversely subhexagonal, dorsally convex, relatively smooth and sparsely setose; 2) the absence of a lateral lobe on the frontal margin; 3) the quadridentate carapace anterolateral margin, where the two anterior teeth are relatively low and broad while the posterior two are more developed and acute; 4) the distinctly unequal chelipeds; and 5) the relatively broad male thoracic sternum and abdomen.	en	Mendoza, Jose Christopher E., Ng, Peter K. L. (2011): Leelumnus radium, a new genus and species of pilumnid crab from marine encrusting communities in Singapore (Crustacea: Decapoda: Brachyura: Pilumnidae). Zootaxa 2809: 58-66, DOI: 10.5281/zenodo.201036
E3508794B30DB92BAEC841DCFA84FDD0.taxon	materials_examined	Comparative material. Aniptumnus quadridentatus (De Man, 1895): 6 males (6.7 × 4.4 mm – 14.6 × 10.0 mm), 6 females (7.9 × 5.3 mm – 11.0 × 7.1 mm) (ZRC 1989.3649 – 3660), from barnacle clumps on kelong pole, with mussels, Lim Chu Kang mangroves, Singapore. Aniptumnus vietnamicus Ng & Clark, 2008: Holotype male (7.9 × 5.7 mm) (ZRC 1970.1.10.1), paratype female (8.8 × 6.5 mm) (ZRC 1970.1.10.2), Nhatrang Bay, Vietnam, coll. R. Serène, 10 Apr. 1966. Latopilumnus conicus Ng & Clark, 2008: 2 male paratypes (3.3 × 2.3 mm, 3.9 × 2.8 mm), 2 females (4.8 × 3.3 mm, 5.0 × 3.4 mm) (ZRC 2003.0343), Conic Island Cave, 22 º 21´54 ˝ N, 114 º 23´22 ˝ E, Hong Kong, coll. 25 Oct. 2002. Latopilumnus malardi (De Man, 1914): paralectotype female (7.4 × 5.2 mm) (RMNH-D 2187), in clumps of Balanus tintinnabulum (Cirripedia), Madagascar, coll. L. M. Malard, no date.	en	Mendoza, Jose Christopher E., Ng, Peter K. L. (2011): Leelumnus radium, a new genus and species of pilumnid crab from marine encrusting communities in Singapore (Crustacea: Decapoda: Brachyura: Pilumnidae). Zootaxa 2809: 58-66, DOI: 10.5281/zenodo.201036
E3508794B30EB92EAEC843E2FE9CFB65.taxon	materials_examined	Material examined. Holotype male (18.1 × 11.6 mm) (ZRC 2011.0036), Paku Buoy, 01 º 23.539´N, 104 º 00.142´E, off Changi Point, coll. S. L. M. Teo et al., 15 Apr. 2010. Paratypes: 1 male (9.6 × 6.5 mm), 1 female (12.7 × 8.0 mm), 1 ovigerous female, (11.5 × 7.5 mm) (ZRC 2011.0037), Lek’s oyster farm, off northeastern Tekong Island, coll. S. L. M. Teo et al., 26 Aug. 2010; 1 male (12.6 × 8.5 mm), 1 female (10.0 × 6.9 mm) (ZRC 2011.0038), buoy, 01 º 14.679´N, 103 º 52.180´E, off eastern Sentosa Island, coll. S. L. M. Teo et al., 7 Jan. 2011; 7 males (7.1 X 6.0 mm - 16.3 X 10.5 mm), 8 females (7 ovigerous, 6.8 X 5.4 mm - 12.7 X 8.75 mm) (ZRC 2011.0039), 1 male, (9.8 X 6.7 mm) 1 ovigerous female (10.1 X 6.7 mm) (NHM), 1 male, (8.5 X 5.7 mm), 1 ovigerous female, (8.8 X 5.9 mm) (RMNH), Lek’s oyster farm, off northeastern Tekong Island, amongst encrusting community on submerged nets and ropes, coll. J. C. Mendoza & S. K. Tan, 28 Feb. 2011. All localities in Singapore.	en	Mendoza, Jose Christopher E., Ng, Peter K. L. (2011): Leelumnus radium, a new genus and species of pilumnid crab from marine encrusting communities in Singapore (Crustacea: Decapoda: Brachyura: Pilumnidae). Zootaxa 2809: 58-66, DOI: 10.5281/zenodo.201036
E3508794B30EB92EAEC843E2FE9CFB65.taxon	description	Description of holotype. Carapace transversely subhexagonal, width 1.5 – 1.6 times length; regions poorly defined; dorsal surface convex, mostly smooth except for patches of minute granules on protogastric and mesobranchial regions, sparsely covered with long and short, plumose setae. Front moderately produced beyond orbits, divided into 2 lobes by V-shaped notch continuing posteriorly as narrow fissure reaching tip of proepistome ventrally; anterior margin of lobes gently concave, granulate, mesial angle more produced than lateral, lateral angle low, not distinctly separated from supraorbital margin; fronto-orbital region relatively narrow transversely, ca. 0.4 times maximum carapace width. Supraorbital margin entire but lined with small granules. Anterolateral margin granulate; exorbital angle low, not prominently projecting; rest of anterolateral margin with 4 distinct teeth; first tooth smallest, connected to exorbital angle by distinct, horizontal, granulate crest; subsequent teeth projecting laterally, curving anteriorly, second broadly triangular, third and fourth relatively more acute. Posterolateral margin almost straight to slightly sinuous, converging towards gently convex posterior carapace margin. Basal antennal article subrectangular, filling orbital hiatus; flagellum long. Antennules folding transversely; proepistome (interantennular septum) narrow. Orbits transverse, relatively short, rounded; eyes filling entire orbital space; distal part of short ocular peduncle covered with minute granules; cornea prominent, rounded. Infraorbital margin distinctly granulate, internal infra-orbital tooth projecting, triangular, visible from dorsal view. Suborbital, subhepatic, pterygostomial regions finely granulate. Epistome well-produced; posterior border with acute median projection, with prominent notches laterally. Endostome with well-defined ridges forming channel for efferent water current with endopod of first maxillipeds. Third maxillipeds short, stout; merus quadrate, anterolateral angle rounded, not prominently produced, surface finely granular, especially along margins; palps long; ischium subrectangular, with shallow submedian sulcus; exopod stout, distal edge almost reaching anterior edge of merus, inner subdistal tooth prominent, with well-developed flagellum. Thoracic sternum narrow, surface smooth to finely granulate, sparsely setose. Sternites 1, 2 fused; sternites 2, 3 completely separated by suture; sternites 3 / 4 partially fused, suture demarcated as deep lateral notches; sutures 4 / 5, 5 / 6 interrupted medially, 6 / 7, 7 / 8 complete; small median, triangular gap between sternites 6, 7. Median line on sternites 4, 6, 7, 8. Sternal press-button on sternite 5, near suture 4 / 5. Chelipeds distinctly unequal. Inner margins of fused basis-ischium and merus granulate. External surface of carpus rugose, with rounded granules; inner distal angle produced as distinct tooth. Major chela robust; palm inflated, external surface smooth, glabrous; fingers distinctly shorter than palm; fixed finger deflexed, with larger teeth on cutting margin than those of dactylus; dactylus with shallow longitudinal groove on external surface. External surface of minor chela with 2 or 3 longitudinal rows of round granules, setose; fingers shorter than palm; fixed finger deflexed, with 2 longitudinal grooves on external surface, cutting edges with several low teeth. Ambulatory legs moderately long, P 3 longest, coxa-to-dactylus length subequal to maximum carapace width; setose, especially on carpus, propodus and dactylus. Articles relatively smooth, devoid of granules. Length of merus about 3.1 times width; distal end with distinct submedian, longitudinal notch, joining up with deep, transverse, subdistal groove. Dactylo-propodal locking mechanism present; distal propodal condyle large, rounded; corresponding tubercle on proximal end of dactylus small, truncatiform. Dactylus nearly straight, ending in a curved, chitinous claw. Abdomen with all somites freely articulating, surfaces generally smooth, sparsely setose. Somite 6 subquadrate, lateral margins subparallel. Telson subtriangular, median length subequal to basal width; lateral margins almost straight, tip rounded, reaching level of coxo-sternal condyles of cheliped. G 1 sinuous, lateral edge lined with stiff, plumose setae; distal part distinctly flared, flattened, with numerous stiff, spiniform, simple setae. G 2 short, sigmoid, about one-fifth length of G 1. Penis short, papilliform, emerging from tip of swollen sternal condyle of P 5 coxa. Female morphology. Similar to that of the male in all non-sexual characters. The vulvae are relatively small and have a small sternal cover originating from the posterior margin. The anterior edge of the vulva does not reach sternal suture 5 / 6 (Fig. 4 A). Colour. The background colour is dirty white with numerous patches of purple on the carapace and pereopods; fngers of chelipeds pink with purple base (Fig. 1).	en	Mendoza, Jose Christopher E., Ng, Peter K. L. (2011): Leelumnus radium, a new genus and species of pilumnid crab from marine encrusting communities in Singapore (Crustacea: Decapoda: Brachyura: Pilumnidae). Zootaxa 2809: 58-66, DOI: 10.5281/zenodo.201036
E3508794B30EB92EAEC843E2FE9CFB65.taxon	etymology	Etymology. The specific epithet is derived from Radium, the 88 th element on the periodic table of elements, to commemorate the occasion of Dr Lee Seng Tee’s 88 th birthday in April 2011. The name is used as a noun in apposition.	en	Mendoza, Jose Christopher E., Ng, Peter K. L. (2011): Leelumnus radium, a new genus and species of pilumnid crab from marine encrusting communities in Singapore (Crustacea: Decapoda: Brachyura: Pilumnidae). Zootaxa 2809: 58-66, DOI: 10.5281/zenodo.201036
E3508794B30EB92EAEC843E2FE9CFB65.taxon	discussion	Remarks. Leelumnus radium gen. et sp. nov., was collected from encrusting communities on floating and semi-submerged structures around Singapore. It has not been found in any other benthic habitats in Singapore as yet. Due to the volume of shipping that goes through Singapore, it is possible that this may even be an exotic species that has been transported via fouling communities on the hulls of ships or as larvae in ballast water (see Yeo et al. 2009, 2011).	en	Mendoza, Jose Christopher E., Ng, Peter K. L. (2011): Leelumnus radium, a new genus and species of pilumnid crab from marine encrusting communities in Singapore (Crustacea: Decapoda: Brachyura: Pilumnidae). Zootaxa 2809: 58-66, DOI: 10.5281/zenodo.201036
