identifier	taxonID	type	CVterm	format	language	title	description	additionalInformationURL	UsageTerms	rights	Owner	contributor	creator	bibliographicCitation
C010EF62FFCA683CFAE7FE73FDACFBFA.text	C010EF62FFCA683CFAE7FE73FDACFBFA.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Stelomon Yeo & Naiyanetr 2000	<div><p>Stelomon gen. nov.</p> <p>Potamon: Ng and Naiyanetr, 1993: 6 (part) (not Potamon Savigny, 1816).</p> <p>Type species. Potamon kanchanaburiens e Naiyanetr, 1992, by present designation.</p> <p>Diagnosis</p> <p>Carapace distinctly broader than long, dorsal surface relatively ¯at. Epigastric cristae well-developed, rugose, almost level with postorbital cristae, separated from postorbital cristae by short, narrow groove; postorbital cristae rugose. External orbital angle triangular; epibranchial tooth distinct, triangular; anterolateral margins strongly convex; posterolateral margins strongly convergent posteriorly; branchial region granulose to rugose; metabranchial region with oblique striae. Ischium of third maxilliped rectangular; exopod exceeding distal margin of ischium, with welldeveloped ¯agellum. Ambulatory legs normal, not elongate. Suture between thoracic sternites 3 and 4 not visible. Male abdomen triangular. G1 stout, slightly sinuous; terminal segment long, stout, twisted along longitudinal axis, with groove for G2 clearly visible from ventral view, subdistal part appearing pectinated, surrounded by short, stiOE setae. G2 distal segment greater than half length of basal segment.</p> <p>Remarks</p> <p>Stelomon kanchanaburiens e (Naiyanetr, 1992), belonged to one of the four groups recognized by Ng and Naiyanetr (1993: 6) among the Thai species of Potamon. While retaining it in the genus Potamon, Ng and Naiyanetr (1993: 8) also commented on the unusual nature of its G1, adding that,`... it might perhaps be necessary in the future to erect a new genus for P. kanchanaburiens e ’. Indeed the form of its G1 is so unique among potamids that its exclusion from Potamon and placement into a separate genus, Stelomon, is necessary. This is reinforced by the discovery of two other species, one undescribed, sharing the same genus diagnostic characters as S. kanchanaburiens e (see later).</p> <p>Externally, members of Stelomon gen. nov. resemble a number of Thai Potamon species. They can, however, be immediately separated from Potamon sensu stricto as well as almost all other Thai potamid genera by the very stout and relatively long G1 terminal segment, which constricts distally and is twisted along the longitudinal axis (versus slender and relatively shorter G1 terminal segment, which usually gently tapers distally and is not longitudinally twisted) (cf. Naiyanetr and Ng, 1990; Ng and Naiyanetr, 1993). Tomaculamon Yeo and Ng, 1997 [north-western Thailand] also shows longitudinal torque in the terminal segment of the G1. Stelomon, however, can easily be diOEerentiated from Tomaculamon by the G2 distal segment being slender and tapering, lacking any distal projection (versus G2 distal segment cylindrical and stout in appearance with an acute conical distal projection) (cf. Yeo and Ng, 1997).</p> <p>The G1 form of Stelomon also appears super®cially similar to that of certain Malayopotamon species [Java, Sumatra], e.g. M. brevimarginatum (De Man, 1892), but the two genera can still be diOEerentiated by the position of the groove for the G2 on the terminal segment of the G1 (ventral in Stelomon versus dorsal or marginal in Malayopotamon) (Ng and Naiyanetr, 1993: 8). The G1 of Stelomon species also resembles that of Stoliczia chaseni (Roux, 1934) [Peninsular Malaysia] but the latter species does not have a ¯agellum on the third maxilliped exopod, and their carapace features diOEer considerably (Ng and Naiyanetr, 1993: 8; Ng, 1988b: 64).</p> <p>Stelomon currently consists of three species, namely, S. kanchanaburiens e (Naiyanetr, 1992), S. pruinosum (Alcock, 1909), and S. tharnlod sp. nov. Potamon (Potamon) turgidulimana Alcock, 1910, reported by Bott (1970: pl. 39 ®gure 38, pl. 48 ®gure 38) [as a species of Ranguna] is probably a fourth species of Stelomon. The G1 ®gured by Bott (1970: pl. 39 ®gure 38) appears to be of the Stelomon type; however, we cannot be sure as the photograph is not very clear. Bott (1970) stated that the specimen (collected from`Upper Tenasserim’) was deposited in the Natural History Museum, London, but we have not been able to ®nd it there and therefore cannot con®rm its generic placement as yet.</p> <p>Etymology</p> <p>The genus name is derived from the Latin word, stela, meaning pillar or column, in arbitrary combination with the genus name Potamon, alluding to the proportionatel y long and stocky G1 terminal segment characteristic of this genus. Gender neuter.</p> <p>Distribution</p> <p>Stelomon gen. nov. is so far known only from Tavoy, Myanmar (5 Burma) and`hills between Burma and Siam’ (Alcock, 1909, 1910); Kanchanaburi and Phetchaburi provinces in western Thailand.</p> </div>	https://treatment.plazi.org/id/C010EF62FFCA683CFAE7FE73FDACFBFA	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.		Plazi	Yeo, D. C. J.;Naiyanetr, P.	Yeo, D. C. J., Naiyanetr, P. (2000): A new genus of freshwater crab (Crustacea: Decapoda: Brachyura: Potamidae) from Thailand, with a description of a new species. Journal of Natural History 34 (8): 1625-1637, DOI: 10.1080/00222930050117521, URL: http://www.tandfonline.com/doi/abs/10.1080/00222930050117521
C010EF62FFCD683FFA1FFBBBFC95FE61.text	C010EF62FFCD683FFA1FFBBBFC95FE61.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Stelomon kanchanaburiens	<div><p>Stelomon kanchanaburiens e (Naiyanetr, 1992)</p> <p>(®gures 1, 2)</p> <p>Ranguna kanchanaburiensi s: Naiyanetr, 1978a: 84 (nomen nudum); Naiyanetr, 1978b: 7 (nomen nudum); Naiyanetr, 1978c: 32, ®gure 3 (nomen nudum); Naiyanetr, 1980: 51 (nomen nudum); Ng, 1988a: 25 (nomen nudum).</p> <p>Potamon kanchanaburiensi s: Naiyanetr, 1985: 260 (nomen nudum); Naiyanetr, 1988: 9, pl. 6 ®gure 5 (nomen nudum); Naiyanetr, 1992a: 2, ®gures 1A, B; Naiyanetr, 1992b: 49; Naiyanetr, 1998: 111; Ng and Naiyanetr, 1993: 7, ®gures 1, 34.</p> <p>Material examined</p> <p>HOLOTYPE: male (62.4 Ö 47.7 mm) (RMNH D 42352), Sai Yok Noi waterfall, Sai Yok District, Kanchanaburi Province, Thailand, coll. P. Naiyanetr, 7 March 1976.</p> <p>PARATYPES: one female (44.2 Ö 34.0 mm) (ZRC 1991.1835), same data as holotype. one male, one female (male 55.1 Ö 41.8 mm) (RMNH D 41616), same locality and collector as holotype, 19 July 1981.</p> <p>Others. Eight males, four females (largest male 59.5 Ö 44.3 mm) (ZRC 1998.114 2), one male, one female (male 52.7 Ö 37.9 mm) (ZRC 1995.43 7), 25 males, 35 females (largest male 61.7 Ö 44.2 mm) (CUMZ), Thong Pha Phum District, Kanchanabur i Province, Thailand, coll. S. Panha and C. Ekavibhathai, 17 November 1991. Two males (larger 42.8 Ö 33.0 mm) (ZRC 1998.1143), two males (larger 51.9 Ö 39.3 mm) (CUMZ), Ban Huay Ka Yeng, Thong Pha Phum District, Kanchanaburi Province, Thailand, coll. S. Phitsaksindhorn, October 1997. Four males (largest 45.9 Ö 35.0 mm) (ZRC 1998.114 4), Nam Chon waterfall, Si Sawat District, Kanchanaburi Province, Thailand, coll. P. Naiyanetr, 24 November 1990.</p> <p>Remarks</p> <p>Stelomon kanchanaburiens e has been diagnosed and illustrated by Ng and Naiyanetr (1993: 7, ®gures 1, 34). We have only to add that in males, thoracic sternites 5 and 6 are medially interrupted, while sternites 7 and 8 are separated by distinct longitudinal median suture (®gure 2I). Part of the thoracic sternum of a female paratype (RMNH D 41616) (44.7 Ö 33.1 mm) is illustrated in ®gure 2J. The nomenclature of this species was clari®ed by Naiyanetr (1992a).</p> <p>In the present study, we re-examined part of the type series, including the holotype, as well as a large series of specimens from other parts of Kanchanaburi Province, to document infra-speci®c variation. Externally, all the specimens are very similar except for noticeable variation in the third maxilliped exopod ¯agellum length. Ng and Naiyanetr (1993: 7, ®gure 34A) noted that the left third maxilliped ¯agellum was distinctly shorter than the merus width. The holotype appears to be unusual in this respect, as other specimens examined had ¯agella ranging from slightly shorter than to subequal to the width of the merus (e.g. ®gure 2A). Unfortunately, the ¯agellum on the right third maxilliped of the holotype is also broken.</p> <p>The present specimens also show variation in the narrowed distal part of the G1 terminal segment. The left G1 of the holotype has a distinctly outwardly hooked distal part with a relatively sharp tip although its right G1 ®gured by Ng and Naiyanetr (1993: ®gures 34B±E) is not hooked but slightly bent distally with a rounded tip. This diOEerence is probably due to the distal part of the right G1 being worn down by abrasion possibly during mating. All the other specimens examined, including paratypes, have G1s with the distal parts hooked outwards to varying degrees and tips being sharp or rounded (®gures 2B±H). The degree of twist of the terminal segment also varies slightly among individuals but the distal opening remains more or less lateral-facing in position (®gures 2E±H). The distinctive hooked structure is present even in the smallest adult male specimen (35.2 Ö 26.4 mm) (ZRC 1998.114 2) and is, therefore, very diagnostic for S. kanchanaburiens e.</p> </div>	https://treatment.plazi.org/id/C010EF62FFCD683FFA1FFBBBFC95FE61	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.		Plazi	Yeo, D. C. J.;Naiyanetr, P.	Yeo, D. C. J., Naiyanetr, P. (2000): A new genus of freshwater crab (Crustacea: Decapoda: Brachyura: Potamidae) from Thailand, with a description of a new species. Journal of Natural History 34 (8): 1625-1637, DOI: 10.1080/00222930050117521, URL: http://www.tandfonline.com/doi/abs/10.1080/00222930050117521
C010EF62FFCE6833FA46FE44FDD9FD2E.text	C010EF62FFCE6833FA46FE44FDD9FD2E.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Stelomon pruinosum (Alcock 1909)	<div><p>Stelomon pruinosum (Alcock, 1909)</p> <p>(®gures 3±5)</p> <p>Potamon pruinosum Alcock, 1909: 246; Alcock, 1910: 50, ®gure 8.</p> <p>Ranguna (Ranguna) rangoonensis: Bott, 1970: 163 (part) (not Potamon (Potamon) rangoonensis Rathbun, 1904).</p> <p>Material examined</p> <p>LECTOTYPE: male (27.4 Ö 21.2 mm) (ZSI 5531/10), Hills between Burma and Siam, coll. and date unknown.</p> <p>PARALECTOTYPE: female (31.2 Ö 23.4 mm) (ZSI 5531/10), same data as lectotype.</p> <p>Other. Male (40.5 Ö 30.4 mm) (ZRC 1998.1145), Ban Krang, Huai Mae Phraeng, Kaeng Krachan National Park, Phetchaburi Province, Thailand, coll. T. Bundhitwongrut, 28 September 1998.</p> <p>Diagnosis</p> <p>Third maxilliped exopod with well-developed ¯agellum, slightly longer than merus width. Male abdomen triangular; telson triangular, with distinctively concave lateral margins, tip rounded. G1 terminal segment relatively long, c. 0.6 times length of subterminal segment, stout, c. 3.9 times longer than broad, twisted along longitudinal axis, with groove for G2 clearly visible from ventral view, with distinct swelling on median part of inner margin, narrowed distal part straight, gently tapered, tip rounded with more or less ventral distal opening. G2 distal segment c. 0.6 times length of basal segment.</p> <p>Remarks</p> <p>In the original description of this species, Alcock (1909) did not provide any other information about the material examined, except for the locality, which was stated only as`Hills between Burma and Siam’(Alcock, 1909: 246). Alcock (1910) subsequently listed three lots of specimens in the Indian Museum under this species including one from the above-mentione d location consisting of an immature male and female specimen (ZSI 5531/10). These two specimens, which were examined, are the de facto syntypes of the species. The male specimen (27.4 Ö 21.2 mm) (ZSI 5531/10) is hereby designated as the lectotype of Stelomon pruinosum (Alcock, 1909). The remaining two lots of specimens mentioned by Alcock (1910), which were collected from`Tavoy’, are not types as they were not mentioned in the original publication and could not be located for examination in the ZSI. Another specimen from Tavoy, a juvenile male (NHM 1909.9.2.1), presented to the Natural History Museum, London, by the ZSI, was previously examined by the second author but this proved inconclusive as the G1 was not fully developed (TuÈrkay and Naiyanetr, 1987: 391).</p> <p>It is a policy of the ZSI not to allow G1s of crab specimens to be detached for examination, therefore, we can only provide a photograph of the lectotype’s G1s in situ (®gures 3C, D), while the present drawings and diagnosis of the G1 of S. pruinosum are based on a non-type adult male specimen instead (®gures 5B±E). This specimen (40.5 Ö 30.4 mm) (ZRC 1998.1145) was recently collected from Kaeng Krachan National Park in Phetchaburi Province, Thailand, and matches the lectotype very well in external morphology and most aspects of the G1 structure. The only diOEerence between the smaller lectotype and the non-type specimen is the G1 being slightly more slender in the former (®gures 3C, D, 5B±E). This is likely to be due to size-related variation and does not have any interspeci®c signi®cance.</p> <p>Bott (1970) synonymized Potamon pruinosum under Potamon (Potamon) rangoonensis Rathbun, 1904 (as a Ranguna), without explanation and without indicating whether he examined the types of either species. However, the specimen collected from Assam and deposited in the Forschungsinstitut Senckenberg (SMF 2807), which was ®gured by Bott (1970: pl. 38 ®gure 35, pl. 47 ®gure 31), is clearly not P. (P.) rangoonensi s sensu stricto. Bott’s specimen is not even congeneric with P. (P.) rangoonensis as its carapace is distinctly less rugose; the external orbital angle is broadly triangular (versus acutely triangular); and the G1 is very diOEerent in form (cf. Rathbun, 1904: pl. 11 ®gure 2; TuÈrkay and Naiyanetr, 1987: 391, ®gures 1, 2). In any case, Bott’s (1970) synonymy was not valid, as Stelomon pruinosum can be immediately separated from both Bott’ s specimen as well as P. (P.) rangoonensis, by its more broadly triangular male abdomen (®gures 3B, 5H; cf. Bott, 1970: 1970: pl. 47 ®gure 31; Rathbun, 1904: ®gure 18) and very diOEerent G1 structure (®gures 3C, D, 5B±E; cf. Bott, 1970: pl. 38 ®gure 35; TuÈrkay and Naiyanetr, 1987: 391, ®gure 2).</p> <p>Externally, Stelomon pruinosum can be separated from S. kanchanaburiens e and S. tharnlod sp. nov. by its relatively broader triangular male abdomen (®gures 3B, 5H, 7H; cf. Ng and Naiyanetr, 1993: ®gure 1C). It is also easily separated from S. kanchanaburiens e by the distal part of its G1 terminal segment being upright (versus distally hooked terminal segment) and the ventral facing G1 distal opening (versus lateral facing distal opening) (®gures 2B±H, 5B±E). A less obvious diOEerence is seen in the ¯agellum of the third maxilliped exopod of S. pruinosum, which is slightly longer than the merus width, while that of S. kanchanaburiens e never exceeds the merus width (®gures 2A, 5A). DiOEerences in the G1 form between S. pruinosum and S. tharnlod are discussed under the Remarks for the latter species (see later). The G1 terminal segment (especially the gently tapered distal part) of S. pruinosum resembles that ®gured by Bott (1970: pl. 39 ®gure 38) for Potamon (Potamon) turgidulimana Alcock, 1910, which may prove to be a fourth Stelomon species (see Remarks under genus). However, there are two other notable diOEerences in the G1 subterminal segment of S. pruinosum (when viewed from all possible orientations) and the species ®gured by Bott (1970), namely: (i) the inner margin lacking a distal hump (versus the inner margin with a distinct distal hump present); and (ii) the outer margin distinctly sloping outwards and being gently convex (versus the outer margin not sloping outwards and being gently concave) (®gure 5B; cf. Bott 1970: pl. 39 ®gure 38).</p> <p>In the live specimen, the dorsal carapace was very dark purple with whitish margins (frontal and anterolateral), cristae (epibranchial and postorbital) and rugae. The chelipeds were light purple with yellowish ®nger tips, and were covered with whitish granules and rugae. The ambulatory legs were light purple with slightly yellowish joints and bright yellow dactyli.</p></div> 	https://treatment.plazi.org/id/C010EF62FFCE6833FA46FE44FDD9FD2E	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.		Plazi	Yeo, D. C. J.;Naiyanetr, P.	Yeo, D. C. J., Naiyanetr, P. (2000): A new genus of freshwater crab (Crustacea: Decapoda: Brachyura: Potamidae) from Thailand, with a description of a new species. Journal of Natural History 34 (8): 1625-1637, DOI: 10.1080/00222930050117521, URL: http://www.tandfonline.com/doi/abs/10.1080/00222930050117521
C010EF62FFC26835FA8AFD16FD44FC3E.text	C010EF62FFC26835FA8AFD16FD44FC3E.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Stelomon tharnlod Yeo & Naiyanetr 2000	<div><p>Stelomon tharnlod sp. nov.</p> <p>(®gures 6, 7)</p> <p>Material examined</p> <p>HOLOTYPE: male (38.5 Ö 29.1 mm) (ZRC 1998.1146), Tritrung waterfall, Tharn Lod, Si Sawat District, Kanchanaburi Province, Thailand, coll. P. Naiyanetr, 8 September 1996.</p> <p>PARATYPE: male (c. 39.5 Ö 29.9 mmÐ broken carapace) (ZRC 1998.114 7), same data as holotype.</p> <p>Diagnosis</p> <p>Third maxilliped exopod with well-developed ¯agellum, slightly longer than merus width. Male abdomen narrowly triangular; telson triangular, with distinctively concave lateral margins, tip rounded. G1 terminal segment relatively long, c. 0.6 times length of subterminal segment, stout, c. 3.4 times longer than broad, twisted along longitudinal axis, with groove for G2 clearly visible from ventral view, with distinct swelling on median part of inner margin, narrowed distal part straight, with distinct subdistal notch on outer margin, tip rounded, with more or less dorsal distal opening. G2 distal segment c. 0.7 times length of basal segment.</p> <p>Remarks</p> <p>Stelomon tharnlod sp. nov. is distinguished from S. kanchanaburiens e by the distal part of its G1 terminal segment being upright (versus distally hooked) (®gures 2B±H, 7B±E). As in S. pruinosum (Alcock, 1909), the ¯agellum of the third maxilliped exopod of S. tharnlod also diOEers slightly from that of S. kanchanaburiens e in being slightly longer than the merus (versus ¯agellum not exceeding merus width) (®gures 2A, 7A). Stelomon tharnlod is similar to S. pruinosum in having a straight and upright G1 terminal segment but, as mentioned earlier, can be separated from it by the narrower shape of its male abdomen (see earlier). In addition, S. tharnlod can be further diOEerentiated from S. pruinosum by the presence of a distinct subdistal notch on its G1 terminal segment outer margin (versus lacking a distinct subdistal notch on the outer margin) as well as its G1 distal opening being dorsal in position (versus ventrally positioned distal opening) (®gures 5B±E, 7B±E).</p> <p>Etymology</p> <p>The species is named after its type locality, Tharn Lod in Kanchanabur i Province, Thailand. The name is used as noun in apposition.</p> </div>	https://treatment.plazi.org/id/C010EF62FFC26835FA8AFD16FD44FC3E	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.		Plazi	Yeo, D. C. J.;Naiyanetr, P.	Yeo, D. C. J., Naiyanetr, P. (2000): A new genus of freshwater crab (Crustacea: Decapoda: Brachyura: Potamidae) from Thailand, with a description of a new species. Journal of Natural History 34 (8): 1625-1637, DOI: 10.1080/00222930050117521, URL: http://www.tandfonline.com/doi/abs/10.1080/00222930050117521
