identifier	taxonID	type	CVterm	format	language	title	description	additionalInformationURL	UsageTerms	rights	Owner	contributor	creator	bibliographicCitation
CEE0FB39EBA354B4849CAECB93E3955D.text	CEE0FB39EBA354B4849CAECB93E3955D.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Angiangmon Do & Nguyen & Dang & Bui & Le 2026	<div><p>Angiangmon gen. nov.</p><p>Type species.</p><p>Angiangmon nuicoto gen. et sp. nov., by present designation.</p><p>Diagnosis.</p><p>Adult male carapace medium size (CW 18.3–32.5 mm, n = 9), subquadrate, dorsal surface flat, almost smooth, few short striae on protobranchial, mesobranchial regions; external orbital angle broadly triangular; epigastric, postorbital cristae low, rounded, distinctly separated by short groove; epistome median posterior margin acutely triangular, epistome lateral margins each with two slightly concavities; epibranchial tooth low with shallow notch; concavity between frontal margins broad, very shallow; anterolateral margin serrated; H-shaped grove poorly developed (Fig. 1 A – D). Third maxilliped exopod reaching beyond upper edge of ischium; exopod flagellum very short, sometimes strongly reduced to a vestigial knob (Fig. 1 D). Fingers of adult male major chela with big gap when closed (Fig. 2 A); ambulatory legs slender and elongated, second pair longest, first pair shortest; ratio of length to width of fourth about 4.2 (Fig. 1 A – C). Male sternopleonal cavity reaching to imaginary line connecting anterior edges of cheliped coxae (Figs 1 C, 2 C); thoracic sternum relatively wide; suture between sternites 2 and 3 deep; sternites 3 and 4 fused, separated by deep, oblique grooves; sternite 8 not visible when pleon closed (Figs 1 C, 2 C). Male telson triangular, lateral margins slightly convex (Fig. 2 C, D). G 1 subterminal article relatively broad; G 1 terminal article relatively long, slightly curved inwards (Figs 3 A, 4 A – D). G 2 longer than G 1, distal article relatively long, shorter than basal article (Fig. 4 E). Vulvae round, proximal margin of each just touching suture with sternite 5 (Fig. 3 B).</p><p>Etymology.</p><p>The genus name is derived from two sources: the first is named after the province of An Giang in Vietnam, where it was first discovered, in combination with the traditional freshwater crab genus name Potamon . The gender is neuter.</p><p>Remarks.</p><p>Angiangmon gen. nov. is morphologically closest to Neolarnaudia Türkay &amp; Naiyanetr, 1987, in having relatively long, inwardly curved first gonopod but it can be easily distinguished by the following characters: (1) the carapace size of adult males is smaller, with the largest specimen measuring 32.5 mm in width (Fig. 1 A) (vs. the carapace size is bigger, the holotype of N. botti Türkay &amp; Naiyanetr, 1987 is 49.8 mm wide, see Türkay and Naiyanetr 1987: fig. 6; N. phymatodes (Kemp, 1923) is 72.8 mm wide, see Do et al. 2017: fig: 2 a); (2) the carapace surface is smooth (Fig. 1 A) (vs. a rugose carapace surface; see Türkay and Naiyanetr 1987: fig. 6; Do et al. 2017: fig: 2 a); (3) the external orbital angle is broadly triangular (Fig. 1 A, B) (vs. the external orbital angle is acutely triangular; see Türkay and Naiyanetr 1987: fig. 6; Do et al. 2017: fig: 2 a); (4) the flagellum of third maxilliped exopod is short or strongly reduced (Fig. 1 E, F) (vs. the flagellum of third maxilliped exopod is long; see Türkay and Naiyanetr 1987; Do et al. 2017: fig: 2 f); (5) the large gap present when fingers of adult male’s major chela close (Fig. 2 A) (vs. the small gap present when fingers of major chela close; see Türkay and Naiyanetr 1987; Do et al. 2017: fig: 2 c); (6) the ambulatory legs are relatively slender (Fig. 1 A, C) (vs. the ambulatory legs are stout; see Türkay and Naiyanetr 1987: fig. 6; Do et al. 2017: fig: 2 a); (7) the suture between thoracic sternites 2 and 3 is deep (Figs 1 C, 2 C) (vs. the suture between thoracic sternites 2 and 3 is shallow; see Türkay and Naiyanetr 1987: fig. 6); (8) the lateral margins of the telson are slightly convex (vs. the lateral margins of the telson are concave; see Türkay and Naiyanetr 1987: fig. 5 a; Do et al. 2017: fig: 2 d); and (9) the G 1 terminal article is curved inward (Fig. 4 A – D) (vs. the G 1 terminal article is almost straight or slightly upcurved; see Türkay and Naiyanetr 1987, figs 2–4). According to Ng and Yeo (2023), adults of more terrestrial crab species have reduced reliance on the flagellum of the exopod of the third maxilliped. Indeed, Angiangmon gen. nov. is a semiterrestrial species, whereas Neolarnaudia inhabits mountain streams (Do et al. 2017). The specimens were collected on land away from water where they were observed crawling on large rocks (Fig. 6). In addition, the distribution of Angiangmon is geographically distinct from that of the Neolarnaudia genus: the new genus occurs in the southwest of Vietnam, whereas the latter is distributed in South Central Vietnam.</p><p>The shape of the carapace of Angiangmon gen. nov. is similar to that of Dalatomon Dang &amp; Ho, 2007 . However, the new genus can easily be separated from Dalatomon by a suite of characteristics: the flagellum of third maxilliped exopod is short or strongly reduced (Fig. 1 E, F) (vs. the flagellum of third maxilliped exopod is well developed; see Dang and Ho 2005: fig. 5; Yeo and Ng 2007 as Kempamon Yeo &amp; Ng, 2007); the suture between thoracic sternites 3 and 4 is visible (Fig. 2 C) (vs. the suture between thoracic sternites 3 and 4 is not visible; see Dang and Ho 2005, fig. 5; Yeo and Ng 2007: fig. 7 C); G 1 terminal article is relatively long, curved inwards, tip pointed without dorsal flap (Figs 3 A, 4 A – D) (vs. G 1 terminal article is relatively short, curved outwards, tip broadly truncate with dorsal flap; see Dang and Ho 2005, figs 6–7; Yeo and Ng 2007: fig. 7 D).</p></div>	https://treatment.plazi.org/id/CEE0FB39EBA354B4849CAECB93E3955D	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Pensoft via Plazi	Do, Van Tu;Nguyen, Tong Cuong;Dang, Van Dong;Bui, Thuy Linh;Le, Hung Anh	Do, Van Tu, Nguyen, Tong Cuong, Dang, Van Dong, Bui, Thuy Linh, Le, Hung Anh (2026): Two new genera and two new species of freshwater crab (Crustacea, Brachyura, Potamidae, Potamiscinae) from southern Vietnam. Zoosystematics and Evolution 102 (4): 1065-1078, DOI: 10.3897/zse.102.187291
B64BBCB5711A5069968F8A4F7C641E26.text	B64BBCB5711A5069968F8A4F7C641E26.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Angiangmon nuicoto Do & Nguyen & Dang & Bui & Le 2026	<div><p>Angiangmon nuicoto sp. nov.</p><p>Figs 1, 2, 3, 4, 5</p><p>Type material.</p><p>Holotype. adult male, 32.5 × 25.3 mm, IB -FS-Anx 01, Vietnam, An Giang Province, Tri Ton Commune, <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=104.9912&amp;materialsCitation.latitude=10.38031" title="Search Plazi for locations around (long 104.9912/lat 10.38031)">Co To Mountain</a>, 10°22'49.116"N, 104°59'28.34999"E, 24 May 2018, collected by Do Van Tu. Paratypes. 3 males, (31.8 × 24.8 mm, 31.6 × 24.3 mm, 28.8 × 22.4 mm); 5 females, (25.8 × 20.2 mm, 28.8 × 17.2 mm, 19.5 × 15.2 mm, 18.3 × 15.0 mm), IB -FS-Anx 02, same data as holotype .</p><p>Description.</p><p>Carapace subquadrate, about 1.3 times broader than long; female smaller than male; dorsal surface relatively low, not inflated, regions defined (Fig. 1 A, B). Frontal region smooth; lateral parts of protobranchial and mesobranchial regions with a few short striae; orbital, mesogastric, urogastric, cardiac and intestinal regions smooth; suborbital region with a few striae and very small granules; pterygostomial region covered by short striae (Fig. 1 A, B). Epigastric cristae low, not sharp, rugose, separated by narrow, deep Y-shaped furrow, separated from postorbital cristae by short, shallow groove; postorbital cristae low, not sharp, confluent with epibranchial tooth (Fig. 1 A, B). Cervical grooves discernible; H-shaped median gastric groove developed (Fig. 1 A, B). Frontal margin divided into 2 broad, medium lobes, separated by broad shallow concavity; margin of each lobe gently convex, confluent with supraorbital margin (Fig. 1 A, B, D). External orbital angle broadly triangular, with outer margin longer than inner margin, slightly convex, demarcated from rest of anterolateral margin by small, shallow notch, lined with distinct granules; epibranchial tooth distinct, low, broadly triangular (Fig. 1 A, B, D). Anterolateral margins convex, serrated, lined with distinct, widely spaced granules (Fig. 1 A, B). Posterolateral margin almost straight (Fig. 1 A, B). Orbits subovate; eyes normal, filling most of orbital space; ocular peduncle long; cornea normal (Fig. 1 A, D). Supra- and infraorbital margins sinuous, lined with small but distinct granules (Fig. 1 D). Suborbital margin concave, complete, lined with small granules (Fig. 1 D). Posterior margin of epistome broadly triangular at median, each lateral margin, slightly sinuous, with only concavity (Fig. 1 D).</p><p>Third maxilliped sparsely covered in long setae, ischium subtrapezoidal, about 1.4 times longer than wide, with distinct median oblique groove, distomesial margin slightly rounded; merus short, subrectangular, about 0.6 times as long as wide, outer surface concave, anteroexternal angle nearly right-angled; exopod slender, with prominent anterointernal margin tooth, short, reaching just upper edge of ischium, flagellum very short, sometimes strongly reduced to a vestigial knob (Fig. 1 E, F).</p><p>Chelipeds asymmetrical, stout with significant difference between males and females; chelipeds more symmetrical in females (Figs 1 A, 1 C, 2 A, 2 B). Anterior margin of basis-ischium almost smooth; inner margins of merus granulated (Fig. 1 A, B). Outer surface of carpus smooth, inner distal angle with distinct sharp tooth (Fig. 1 A, C). Outer surfaces of chelae slightly rugose; chela palm in large males approximately 2.3 times as long as broad; major chela stouter, longer than minor chela (Fig. 2 A). Major chela with fingers stout, curved, slightly longer than palm, outer surface smooth; cutting edges of both fingers with differently sized teeth and denticles, big gap when fingers closed, tips crossing (Fig. 2 A). Minor chela with fingers slender, shorter than major chela, fingers tips curved, almost no gap when closed (Fig. 2 A).</p><p>Ambulatory legs slender, elongated; second pair longest, first pair shortest (Fig. 1 A, C). Outer surface of merus slightly rugose, outer dorsal and ventral margins slightly crenulated, inner margin lined with large granules, length to width ratio of fourth merus 4.2; carpus slightly rugose, outer surface with submedian crista on first to third legs, absent on the fourth leg; propodus subrectangular, length to width ratio of fourth propodus 3.3; dactylus gently curved, margins with short, sharp corneous spines on inner and outer margins (Fig. 1 A, C).</p><p>Thoracic sternum relatively wide, surface smooth with lateral margins slightly setose (Fig. 1 C, 2 C). Sternites 1 and 2 completely fused to form broad triangular plate, lateral margin distinctly convex, separated from sternite 3 by deep, complete suture, suture convex in middle; sternites 3 and 4 fused, with demarcated by oblique concavity and deep, oblique grooves; sternite 8 not visible when pleon closed. Sternopleonal cavity reaching to imaginary line connecting anterior edges of cheliped coxae (Fig. 2 C). Male pleon narrowly triangular; telson triangular, lateral margins slightly convex, width to length ratio 1.2; proximal margin of telson slightly narrower than distal margin of somite 6; somite 6 subrectangular, width to length ratio 2.0 (Fig. 2 C, D). Male pleonal locking tubercle just above median part of sternite 5 (Fig. 3 A). Female pleon ovate, covering most of thoracic sternum. Vulvae round; low vulvar occupied mostly in sternite 6 with the proximal margin appressed against the suture with sternite 5 (Figs 2 E, 3 B).</p><p>G 1 slender, slightly sinuous, reaching to median part of sternite 5, with terminal and subterminal articles clearly demarcated; subterminal article relatively broad, 3.6 times longer than broad, neck-like at distal part, 1.7 times as long as the terminal article; terminal article relatively long, bent at about 10 ° along longitudinal axis, without fold, distal part curved inwards, tip pointed, about 0.5 times length of subterminal article (Figs 3 A, 4 A – D). G 2 longer than G 1, distal article relatively long, about 0.8 times length of basal article (Figs 3 A, 4 E).</p><p>Coloration.</p><p>The dorsal surface is reddish-purple. The ambulatory legs P 2-5 are purple (Fig. 5 A, B).</p><p>Etymology.</p><p>The new species is named after the type locality, “ Núi Cô Tô ”. The name is used as a noun in apposition.</p><p>Habitat.</p><p>Specimens of this species were collected near the summit of Co To mountain, where no streams are present. The vegetation in this area is dominated by medium- to small-sized trees interspersed with shrubs. Numerous large boulders form crevices and cavities that provide shelters for this crab species (Fig. 6).</p><p>Distribution.</p><p>Our unpublished survey data from across Vietnam indicates that this species is restricted to Co To Mountain in Tay Ninh Province, with an estimated area of occupancy of less than 50 km 2.</p><p>Remarks.</p><p>Based on field surveys conducted in May 2018, the new genus and species appear to be restricted to a single locality on Co To Mountain, which is subject to ongoing habitat degradation. This forested mountain may represent the only remaining habitat for the species. However, several anthropogenic and environmental factors, including mining, rapid expansion of tourism infrastructure on the summit, intensive agriculture in the surrounding foothills, as well as climate change – related impacts such as droughts and the forest fire in April 2024, pose significant threats to its long-term survival.</p></div>	https://treatment.plazi.org/id/B64BBCB5711A5069968F8A4F7C641E26	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Pensoft via Plazi	Do, Van Tu;Nguyen, Tong Cuong;Dang, Van Dong;Bui, Thuy Linh;Le, Hung Anh	Do, Van Tu, Nguyen, Tong Cuong, Dang, Van Dong, Bui, Thuy Linh, Le, Hung Anh (2026): Two new genera and two new species of freshwater crab (Crustacea, Brachyura, Potamidae, Potamiscinae) from southern Vietnam. Zoosystematics and Evolution 102 (4): 1065-1078, DOI: 10.3897/zse.102.187291
C4BA1AE0A028512A8D32CD9669987514.text	C4BA1AE0A028512A8D32CD9669987514.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Lamdongmon Do & Nguyen & Dang & Bui & Le 2026	<div><p>Lamdongmon gen. nov.</p><p>Type species.</p><p>Lamdongmon tanhlinhensis gen. et sp. nov., by present designation.</p><p>Diagnosis.</p><p>Carapace medium in size (CW 9.2–26 mm, n = 9), subquadrate, dorsal surface gently convex, branchial and metabranchial regions weakly granulose; metagastric, urogastric, cardiac, intestinal regions smooth; orbital regions almost smooth; suborbital, subhepatic regions, pterygostomial regions almost smooth; epigastric cristae low, indistinctly separated from postorbital cristae; postorbital cristae round, low, discontinuous; external orbital angle triangular, external orbital tooth indiscernible, not clearly demarcated from rest of anterolateral margin; epibranchial tooth very low, not visible; concavity between frontal margins broad, very shallow; anterolateral margin convex, not serrated; H-shaped groove well developed (Fig. 7 A, B). Epistome with posterior margin acutely triangular at median, each lateral margin with 2 concavities (Fig. 7 C). Exopod of third maxillipeds reaching beyond upper edge of ischium with well-developed flagellum (Fig. 7 D). Fingers of adult male major chela with wide gap when closed (Fig. 8 A); ambulatory legs normal, not elongated, covered with dense setae, third pair longest, first pair shortest; ratio of length to width of fourth merus 3.3 (Fig. 7 A, B). Sternopleonal cavity reaching to imaginary line connecting anterior edges of cheliped coxae (Figs 7 B, 8 C). Thoracic sternum relatively wide; sternites 3 and 4 completely fused, separated by oblique grooves; sternite 8 not visible when pleon closed (Figs 7 B, 8 C). Telson widely triangular, lateral margins concave (Fig. 8 C, D). G 1 subterminal article relatively narrow; G 1 terminal article strongly sinuous, slender, curved outwards along basal two-thirds, distal part abruptly directed upwards (Figs 9 A, 10 A – D). G 2 slightly longer than G 1, distal article shorter than basal article (Fig. 10 E). Vulvae rounded, proximal margin appressed against the suture with sternite 5 (Fig. 9 B).</p><p>Etymology.</p><p>The genus is named after the location, the province of Lam Dong, in combination with the genus name Potamon . The gender is neuter.</p><p>Remarks.</p><p>Lamdongmon gen. nov. is easy to separate from other genera in its unique G 1 characters. The new genus is most similar to Dalatomon Dang &amp; Ho, 2007 in the general appearance of the carapace. However, Lamdongmon gen. nov. can be distinguished by the following characteristics: the epibranchial tooth is indistinct (Fig. 7 A) (vs. the epibranchial tooth is distinct; Yeo and Ng 2007: fig. 7 A); the suture between sternites 3 and 4 is discernible (Fig. 8 C) (vs. the suture between sternites 3 and 4 is indiscernible; Yeo and Ng 2007: fig. 7 C); and the G 1 terminal article is relatively long, slender, curved outwards along basal two-thirds, distal part abruptly directed upwards, tip pointed in appearance without a dorsal flap (Figs 9 A, 10 A – D) (vs. G 1 terminal article is relatively short, stout, gently curved outwards, tip broadly truncate or flared in appearance, with a dorsal flap; Yeo and Ng 2007: fig. 7 D).</p><p>Lamdongmon gen. nov. resembles Dacuomon Ng &amp; Ngo, 2023 somewhat in the shape of the carapace, but the new genus can be distinguished by the following characters: the postorbital crista is round (Fig. 7 A) (vs. the postorbital crista is sharp; Ng and Ngo 2023: fig. 2 A); the external orbital and branchial teeth are indistinct (Fig. 7 A) (vs. the external orbital teeth are distinct; Ng and Ngo 2023: fig. 2 A); the median part of the posterior margin of the epistome has an acutely triangular lobe (Fig. 7 C) (vs. the median part of the posterior margin of the epistome has a low, broadly triangular lobe; Ng and Ngo 2023: fig. 2 E); the third maxilliped is covered with a few short setae, exopod with flagellum shorter than width of merus (Fig. 7 D) (vs. the third maxilliped is covered with numerous long simple setae, exopod with flagellum longer than width of merus; Ng and Ngo 2023: fig. 3 A); the outer surface of the chela is almost smooth (Fig. 8 A) (vs. the outer surface of the chela is covered with prominent granules; Ng and Ngo 2023: fig. 2 F); there is a distinct groove between the sternites 3 and 4 (Fig. 8 C) (vs. there is no groove between the sternites 3 and 4; Ng and Ngo 2023: fig. 3 C); and the terminal article of G 1 relatively long, strongly curved along basal two-thirds, distal part abruptly directed upwards, without a dorsal flap (Figs 9 A, 10 A – D) (vs. the terminal article relatively short, gradually curved outwards, distal part not directed upwards with a dorsal; Ng and Ngo 2023: fig. 3 C).</p></div>	https://treatment.plazi.org/id/C4BA1AE0A028512A8D32CD9669987514	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Pensoft via Plazi	Do, Van Tu;Nguyen, Tong Cuong;Dang, Van Dong;Bui, Thuy Linh;Le, Hung Anh	Do, Van Tu, Nguyen, Tong Cuong, Dang, Van Dong, Bui, Thuy Linh, Le, Hung Anh (2026): Two new genera and two new species of freshwater crab (Crustacea, Brachyura, Potamidae, Potamiscinae) from southern Vietnam. Zoosystematics and Evolution 102 (4): 1065-1078, DOI: 10.3897/zse.102.187291
0BB62C367AA256F9809FF68864A11946.text	0BB62C367AA256F9809FF68864A11946.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Lamdongmon tanhlinhensis Do & Nguyen & Dang & Bui & Le 2026	<div><p>Lamdongmon tanhlinhensis sp. nov.</p><p>Figs 7, 8, 9, 10, 11</p><p>Type material.</p><p>Holotype. adult male (26.0 × 21.0 mm), IB -FS-Ltx 01, Vietnam, Lam Dong Province, Tanh Linh Commune, <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=107.76&amp;materialsCitation.latitude=11.003384" title="Search Plazi for locations around (long 107.76/lat 11.003384)">Ong Mountain Nature Reserve</a>, 11°0'12.18"N, 107°45'36.01"E, 21 September 2019, collected by Phan Quang Tien. Paratypes. 6 males (25.0 × 20.0 mm, 24.4 × 20.0 mm, 23.0 × 19.0 mm, 22.0 × 19.0 mm, 21.0 × 17.9 mm, 19.1 × 16.1 mm), 3 females, (25.0 × 20.0 mm, 23.6 × 20.4 mm, 9.2 × 7.0 mm), IB -FS-Ltx 02, same data as holotype .</p><p>Description.</p><p>Carapace subquadrate, broader than long (CW / CL = 1.2); adult female slightly smaller than adult male; dorsal surface not inflated, regions well defined (Fig. 7 A). Frontal region almost slightly rugose; lateral parts of anterolateral and branchial regions weakly granulose; mesogastric region weakly rugose; urogastric, cardiac and intestinal regions smooth; orbital regions almost smooth; suborbital and pterygostomial regions uneven, almost smooth (Fig. 7 A, B). Epigastric cristae low, round, separated by narrow, shallow Y-shaped furrow, indistinctly separated from postorbital cristae; postorbital cristae low, discontinuous, confluent with epibranchial tooth (Fig. 7 A). Cervical grooves distinct; H-shaped median gastric groove developed (Fig. 7 A). Frontal margin slightly divided into 2 lobes, concavity between 2 lobes very shallow; margin of each lobe gently convex, confluent with supraorbital margin (Fig. 7 A, C). External orbital angle triangular, with outer margin longer than inner margin, demarcated from rest of anterolateral margin by very shallow notch; epibranchial tooth indistinct, very low (Fig. 7 A). Anterolateral margins convex (Fig. 7 A). Posterolateral margin concave in middle, convergent posteriorly (Fig. 7 A). Orbits subovate; eye filling most of orbital space; ocular peduncle long; cornea normal (Fig. 7 A, C). Supraorbital margins gently sinuous (Fig. 7 C). Suborbital margin concave, complete (Fig. 7 C). Posterior margin of epistome acutely triangular at median, each lateral margin with 2 concavities (Fig. 7 C).</p><p>Third maxilliped ischium subtrapezoidal, about 1.3 times longer than wide, with distinct median oblique groove, distomesial margin rounded; merus subquadrate, about 0.7 times as long as wide, outer surface concave, anteroexternal angle nearly round, not expanded; exopod slender, with prominent anterointernal margin tooth, reaching beyond upper edge of ischium, to approximately a tenth of length of merus, flagellum well-developed, shorter than width of merus (Fig. 7 D).</p><p>Chelipeds asymmetrical, stout; showing marked sexual dimorphism, more symmetrical in females (Figs 7 A, 7 B, 8 A). Anterior margin of basis-ischium almost smooth outer dorsal and ventral margins slightly crenulated, upper part of inner margin lined with a few large granules (Figs 7 A, 7 B, 8 A, 8 B). Outer surface of carpus rugose, inner distal angle with distinct sharp tooth (Fig. 7 A). Outer surfaces of chelae rugose; chela palm in large males approximately 2.1 times as long as broad; major chela stouter, longer than minor chela (Figs 7 A, 8 A). Major chela with fingers stout, gently curved, longer than palm, outer surface smooth; cutting edges of both fingers with different sized teeth and denticles, forming wide gap when fingers closed, tips crossing (Figs 7 A, 8 A). Minor chela with fingers slender, shorter than major chela, fingers tips relatively straight, almost no gap when closed (Figs 7 A, 8 A).</p><p>Ambulatory legs normal, not elongated, covered with dense setae; second pair longest, first pair shortest (Fig. 7 A, B). Outer surface of merus slightly rugose, dorsal margin weakly serrated, length to width ratio of fourth merus 3.3; carpus slightly rugose, outer surface with submedian crista on first to third legs, absent on the fourth leg; propodus subrectangular, length to width ratio of fourth propodus 2.8; dactylus short, gently curved; upper margins of carpus, upper and lower margins of propodus, and dactylus with long, sharp corneous spines (Fig. 7 A, B).</p><p>Thoracic sternum relatively wide, surface smooth, lateral margins slightly setose (Figs 7 B, 8 C). Sternites 1 and 2 completely fused to form broad triangular plate, lateral margin distinctly convex, separated from sternite 3 by deep, complete suture; sternites 3 and 4 completely fused, with separation demarcated by oblique concavity and wide oblique groove; sternite 8 not visible when pleon closed. Sternopleonal cavity reaching to imaginary line connecting anterior edges of cheliped coxae (Figs 7 B, 8 C, 8 D). Male pleon widely triangular; telson triangular, wide, lateral margins concave, width to length ratio 1.6; proximal margin of telson wider than the distal margin of somite 6; somite 6 subrectangular, width to length ratio 2.5 (Figs 7 B, 8 C, 8 D). Male pleonal locking tubercle just below median part of sternite 5 (Fig. 9 A). Female pleon ovate, covering most of thoracic sternum (Fig. 8 E). Vulvae rounded; occupied mostly in sternite 6 with proximal margin appressed against suture with sternite 5 (Fig. 9 B).</p><p>G 1 slender, strongly sinuous, reaching to suture between sternites 4 and 5, with terminal and subterminal articles clearly demarcated; subterminal article relatively narrow, 3.3 times as long as broad, neck-like at distal part, 2.0 times as long as the terminal article; terminal article long, curved outward along basal two-thirds, distal part abruptly directed upwards, about 0.5 times length of subterminal article (Figs 9 A, 10 A – D). G 2 slightly longer than G 1, distal article short, about 0.5 times length of basal article (Fig. 10 E).</p><p>Live colouration.</p><p>The dorsal surface of carapace is dark yellow. Chelipeds and ambulatory legs are bright yellow (Fig. 11).</p><p>Etymology.</p><p>The new species is named after the type locality, “ Tánh Linh ”. The name is used as a noun in apposition.</p><p>Habitat.</p><p>This species was collected from a terrestrial habitat near streams, with sites located relatively close (from a few meters to several hundred meters) to a stream (Fig. 12). The species is presumed to lack burrowing behavior, as no crab burrows attributable to it were observed in the area. Instead, the individuals may utilize pre-existing crevices or cavities as refuges.</p><p>Distribution.</p><p>Our unpublished survey data from across Vietnam indicates that this species is restricted to Ong Mountain Nature Reserve in Tanh Linh Commune, Lam Dong Province, with an estimated area of occupancy of less than 250 km 2.</p></div>	https://treatment.plazi.org/id/0BB62C367AA256F9809FF68864A11946	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Pensoft via Plazi	Do, Van Tu;Nguyen, Tong Cuong;Dang, Van Dong;Bui, Thuy Linh;Le, Hung Anh	Do, Van Tu, Nguyen, Tong Cuong, Dang, Van Dong, Bui, Thuy Linh, Le, Hung Anh (2026): Two new genera and two new species of freshwater crab (Crustacea, Brachyura, Potamidae, Potamiscinae) from southern Vietnam. Zoosystematics and Evolution 102 (4): 1065-1078, DOI: 10.3897/zse.102.187291
