106,744 research outputs found
Découverte de Geranium x oxonianum Yeo près de Lyon (G. endressii x G. versicolor)
No full textDiscovery of Geranium x oxonianum Yeo near Lyon (France).
Geranium x oxonianum Yeo (G. endressii Gay x G. versicolor L.) has been observed, naturalized, in a wooded and moist vale at the north of the conurbation of Lyon. This taxon would be new for the regional flora.Geranium x oxonianum Yeo (G. endressii Gay x G. versicolor L.) a été observé, à l'état subspontané, dans un vallon boisé et humide du nord de l'agglomération lyonnaise. Apparemment bien naturalisé, ce taxon serait nouveau pour notre flore régionale.Denninger Claude, Dutartre Gilles. Découverte de Geranium x oxonianum Yeo près de Lyon (G. endressii x G. versicolor). In: Bulletin mensuel de la Société linnéenne de Lyon, 77ᵉ année, n°1-2, Janvier-février 2008. pp. 3-4
Découverte de Geranium x oxonianum Yeo près de Lyon (G. endressii x G. versicolor)
No full textGeranium x oxonianum Yeo (G. endressii Gay x G. versicolor L.) a été observé, à l'état subspontané, dans un vallon boisé et humide du nord de l'agglomération lyonnaise. Apparemment bien naturalisé, ce taxon serait nouveau pour notre flore régionale.</jats:p
Indochinamon phongnha Naruse, Quynh & Yeo, 2011, n. sp.
No full textIndochinamon phongnha n. sp. (Figs. 6 a, b, 7, 8, 9 a–c) Material examined. Holotype: male (68.6 by 51.9 mm) (ZMHU), Phong Nha National Park, Quang Binh Province, Vietnam, stream near km 49 mark of Ho Chi Minh highway, the branch on the west side, elevation 750m, coll. Vu Ngoc Thanh, 22 Jun. 2006. Paratypes: 1 female (34.9 by 27.5 mm) (ZMHU), same data as holotype; 5 males (25.4 by 20.2 – 44.2 by 33.2 mm), 6 females (17.9 by 14.1 – 43.0 by 32.6 mm), 1 juvenile (15.4 by 12.5 mm) (ZRC 2010.0168), Khe Con Khai stream, Cha Noi, Phong Nha, Quang Binh Prov., Vietnam, 17 ˚ 38.196 'N 106 ˚05.928'E, 263m asl, coll. D. C. J. Yeo & A. D. Tran, 13 Jul. 2004; 2 males (34.3 by 26.6, 31.9 by 24.9 mm), 3 females (38.3 by 29.9 – 54.8 by 41.4 mm), 1 juvenile (17.0 by 13.1 mm) (ZRC 2010.0169), Cha Noi, Phong Nha, Quang Binh Prov., Vietnam, Stream under bridge, 17 ˚ 38.397 'N 106 ˚06.975'E, 261m asl, coll. D. C. J. Yeo & A. D. Tran, 13 Jul. 2004; 3 males (49.0 by 38.3 – 51.3 by 40.1 mm) (ZMHU), 11 males (16.4 by 13.3 – 64.2 by 48.0 mm), 3 females (32.6 by 25.9 – 38.9 by 30.1 mm) (ZRC 2010.0170), Vuc Tro stream, Phong Nha, Quang Binh Prov., 17 ˚ 38.188 'N 106 ˚ 12.810 'E, coll. D. C. J. Yeo & A. D. Tran, 14 Jul. 2004; 3 females (36.1 by 28.1 – 42.8 by 33.0 mm), 2 juveniles (19.6 by 15.3, 17.3 by 13.6 mm) (ZRC 2010.0171), Stream near Forest Ranger station 37, Phong Nha, Quang Binh Prov., Vietnam, 17 ˚ 31.395 'N 106 ˚ 17.716 'E, 86m asl, coll. D. C. J. Yeo & A. D. Tran, 15 Jul. 2004; 5 males (42.0 by 31.5 – 49.1 by 37.2 mm) (ZMHU), 3 males (49.8 by 37.8 – 53.0 by 41.5 mm) (ZRC 2010.0172), Chay stream, Quang Binh Prov., Vietnam, 17 ˚ 33.146 'N 106 ˚ 14.425 'E, 94m asl, coll. D. C. J. Yeo & A. D. Tran, 17 Jul. 2004; 1 male (61.9 by 47.3 mm) (ZRC 2010.0173), Km 23 + 800 HCM Way, near Hang So Dua, Pong Nha National Park, Quang Binh Province, Vietnam, coll. A. D. Tran, 11 Aug. 2001; 1 male (56.9 by 44.0 mm), 1 female (54.2 by 40.8) (ZRC 2010.0174), Thac Xoi waterfall, Phong Nha National Park, Quang Binh Province, Vietnam, coll. Q. K. Hoang & V. K. Dinl, 10 Aug. 2002. Diagnosis. Carapace (Fig. 6 a) oval, CW 1.24–1.34 times (mean 1.30, n = 31) CL, dorsal surface (Fig. 7 a) flat, regions well defined; epigastric crista distinct, oblique, postorbital crista composed of transverse, short cristae, separated from epigastric crista, externally terminated by cervical groove, cervical groove polygonal line-like, anterolateral region scattered with oblique short granules. Frontal to orbital margins cristate, lined with rounded granules, granules of infraorbital margin (Fig. 7 a) larger, infraorbital margin interrupted just below external orbital angle by U-shaped notch; suborbital region scattered with granules; subhepatic region covered with short rows of granules. External orbital angle narrow, directed anteriorly, outer margin length about one and a half times inner margin, outer margin cristate, lined with small granules, epibranchial tooth disconnected from outer margin of external orbital angle by short gap of crista, short, not clearly larger than following granules, directed anteriorly; anterolateral margin strongly convex laterally, cristate, regularly lined with large granules, posterolateral margins strongly convergent posteriorly. Posterior margin of epistome (Fig. 7 a) with one median, long, narrow, sharp lobe, margin besides median lobe composed of elongated granules. Ischium of third maxilliped broadly rectangular, exopod flagellum longer than half width of merus. Male cheliped carpus with rugose outer surface, inner angle with sharp, long tooth, followed vento-proximally by one small tooth; male chela (Fig. 7 b) with swollen palm, scattered with low, rounded granules from outer to lower half of inner surfaces; fingers as long as palm, straight, slightly hook-shaped distally, cutting edge regularly lined with teeth, without gape when closed. Male abdomen (Fig. 6 b) tongue-shaped, first segment with distal margin rimmed; second segment with sublateral notch on distal margin, forming rounded lateral lobes; third segment widest; sixth segment longer than telson, telson longer than width. G 1 (Fig. 8 a, b) with distal third bent outwards; subterminal segment with wide convexity on proximal twofifths of outer margin, distal part of outer margin excavated, connected dorsally to shallow transverse slope; distal segment relatively stout, tip slightly bent proximally in dorsal view, outwards in anterior view, groove for G 2 on lateral surface throughout distal segment, elongated opening on distal ventral surface, dorsal flap (protuberance of ventral outer surface) low, slightly visible medially in dorsal view. G 2 (Fig. 8 c) longer than G 1, flagellum curving outwards, J-shaped. Live colouration. The dorsal carapace and chelipeds, and ambulatory legs, are mostly brownish-grey. The upper half of the third maxillipeds (from the palp to the upper part of the ischium) and the suborbital, pterygostomial, subhepatic, and subbranchial regions are a lighter more orange shade. The anterolateral and external orbital angle margins, orbital and frontal margins, and the posterior margin of the epistome are bright orange in colour. The distal parts of the fingers of the chelae are bright orange with the tips being white, the orange colour spreading to the lower half and cutting edge of the movable finger and to most of the fixed finger (Fig. 6 a, b). Habitat and distribution. The species inhabits slow to fast flowing, forest streams with various combinations of rock, sandy, and mud substrata, and patches of leaf litter, in the Phong Nha-Ke Bang National Park, Quang Binh Province of northern-central Vietnam. Etymology. The new species is named after the type locality, Phong Nha National Park. The name is used as noun in apposition. Remarks. Indochinamon phongnha n. sp. can be distinguished from I. kimboiense by the characters of the carapace and the G 1. In I. phongnha n. sp., the anterolateral margins of the carapace are more produced (Fig. 6 a), the dorsal surface of the carapace is lower (Fig. 7 a), the G 1 is more strongly bent laterally at distal part of the subterminal segment (Fig. 8 a, b), and the dorsal flap of the distal segment of the G 1 is low but proportionately longer (Fig. 8 a, b). In contrast, in I. kimboiense, the anterolateral margins of the carapace are less produced (Fig. 1 a), the dorsal surface of the carapace is slightly convex (Fig. 2 a), the G 1 is less strongly bent laterally at distal part of the subterminal segment (Fig. 3 a, b), and the dorsal flap of the distal segment of the G 1 is slightly higher but shorter than that of I. phongnha n. sp. (Fig. 3 a, b).Published as part of Naruse, Tohru, Quynh, Nguyen Xuan & Yeo, Darren C. J., 2011, Three new species of Indochinamon Yeo & Ng, 2007 (Crustacea: Brachyura: Potamoidea: Potamidae) from Vietnam, with a redescription of Ranguna (Ranguna) kimboiensis Dang, 1975, pp. 33-48 in Zootaxa 2732 on pages 41-44, DOI: 10.5281/zenodo.20092
Glyphidrilus gatesi Shen & Yeo 2005
No full textGlyphidrilus gatesi Shen & Yeo, 2005 (Fig. 6) Glyphidrilus gatesi Shen & Yeo, 2005: 16, Fig. 1. Type locality: Sungei Kayu, swamp forest near River Sedili, Johor, Malaysia. Material examined. — Holotype in the ZRC of RMBR (ZRC 1974.12.2.51). Remarks. — Glyphidrilus gatesi differs from G. mekongensis, new species in having shorter wings in 19–½24 and a shorter clitellum in 17–26, genital markings near line b in 15 on the right side only, and in 16–18 and 24–25 on both sides, and median unpaired in 13–19 and 24–27, intestinal origin in 18, three pairs of heart in 9–11, and spermathecae in 15–17.Published as part of Chanabun, Ratmanee, Bantaowong, Ueangfa, Sutcharit, Chirasak, Tongkerd, Piyoros, James, Samuel W. & Panha, Somsak, 2012, A New Species Of Semi-Aquatic Freshwater Earthworm Of The Genus Glyphidrilus Horst, 1889 From The Mekong River (Oligochaeta: Almidae), pp. 265-277 in Raffles Bulletin of Zoology 60 (2) on pages 270-274, DOI: 10.5281/zenodo.450849
Laevimon Yeo & Ng, 2005, new genus
No full textLaevimon, new genus Type species. Laevimon kottelati, new species, by present designation. Diagnosis. Carapace distinctly transverse, high; dorsal surface strongly convex longitudinally and transversely; smooth; grooves weak to indistinct; regions poorly defined; epigastric cristae very weak, indistinct, confluent with postorbital cristae; postorbital cristae indistinct, rounded; antennular fossae slitlike; external orbital angle acutely triangular, separated from epibranchial tooth by distinct, rounded cleft; epibranchial tooth distinct, very low, rounded; anterolateral margin distinctly convex, entire, very weakly cristate; median tooth of posterior margin of epistome low, lateral and outer parts forming continuous sinuous margin, with lateral part convex and outer part gently concave. Ischium of third maxilliped broadly rectangular; exopod reaching beyond upper edge of ischium, with well developed flagellum subequal to or exceeding width of merus. Chelipeds distinctly unequal. Ambulatory legs moderately long, with long, slender dactyli. Suture between thoracic sternites 3 and 4 demarcated by strong ridge; abdominal cavity reaching imaginary line joining median points of coxae of chelipeds. Male abdomen narrowly triangular. G 1 terminal segment about 0.3 times length of subterminal segment, subcylindrical, straight, tip truncate with inner distal angle produced as sharp, narrow projection, proximal part with narrow, humplike, dorsal flap; subterminal segment relatively slender. G 2 with distal segment longer than half of basal segment. Etymology. The genus name is derived from laevis, Latin for smooth or polished, in arbitrary combination with the genus name, Potamon, in allusion to the carapace form of the genus. The gender is neuter. Remarks. Laevimon, new genus, is morphologically closest to Hainanpotamon Dai, 1995, owing to its high, swollen and smooth carapace; long exopod flagellum of third maxilliped; long, slender ambulatory dactyli; and slender G 1 with a short, straight terminal segment and narrow, proximal dorsal flap. Laevimon, however, can be immediately distinguished from Hainanpotamon by the following characters: i) carapace proportionately more strongly convex and raised laterally (versus carapace relatively less strongly convex); ii) postorbital cristae indistinct (versus postorbital cristae distinct); iii) epibranchial tooth very low, rounded (versus epibranchial tooth relatively more developed, triangular); iv) anterolateral margin entire, very weakly cristate (versus anterolateral margin weakly serrated, relatively more distinctly cristate); v) posterior margin of epistome with the lateral and outer parts forming a continuous sinuous margin, with the convex lateral part confluent with the gently concave outer part (versus posterior margin of the epistome with the lateral parts straight and distinct from gently concave outer parts); vi) suture between thoracic sternites 3 and 4 demarcated by distinct, strong ridge (versus suture between thoracic sternites 3 and 4 not discernible); and vii) G 1 terminal segment subcylindrical, with tip truncate (versus G 1 terminal segment conical, with tip tapered) (Figs. 2–6; Dang 1967: fig. 6, 1980: fig. 242; Dang & Tran 1992: figs. 1, 2; see also Table 1; Dai 1995). Other Indochinese potamiscine genera that have swollen, smooth, eggshaped carapaces similar to Laevimon are Thaipotamon Ng & Naiyanetr, 1993 [Thailand], Thaiphusa Ng & Naiyanetr, 1993 [Thailand], and Pudaengon Ng & Naiyanetr, 1995 [Thailand, Laos]. Laevimon is immediately differentiated from these by its unique suite of characters of the third maxilliped, thoracic sternum and G 1 (see Table 1). Crabs of the genus Tiwaripotamon Bott, 1970 [central Vietnam to southern China] also have a relatively smooth carapace (Bott 1970, Ng & Yeo 2001). However, the genus can immediately be distinguished by their distinctly lower and flatter carapace; slender, elongated legs; and third maxilliped with a squarish ischium having a shallow or no sulcus, and a short exopod with a short flagellum. This contrasts with Laevimon species, all of which have a high, swollen carapace; ambulatory legs that are not unusually elongated; and a third maxilliped with a rectangular ischium possessing a distinct sulcus, and a long exopod with a long flagellum (Figs. 2 A, B, 3 A, 4 A, B; cf. Bott 1970, Dai 1999, Ng & Yeo 2001). Distribution. Hai Phong, Thanh Hoa Province, northern Vietnam; Nghe Tinh Province, central Vietnam (Dang & Tran 1992). Laevimon Hainanpotamon Thaipotamon Thaiphusa Pudaengon G 1 terminal Subcylindrical; Conical, with tip Conical, with Conical, with Conical, with segment tip broad and comparatively tip compara tip compara tip comparashape truncate, with slenderer and tively slen tively slen tively slen inner distal tapered, lacking derer and derer and derer and angle produced projection on tapered, lack tapered, lack tapered, lackas sharp, narrow inner distal angle ing projection ing projection ing projection projection on inner distal on inner distal on inner distal angle angle angle G 1 terminal Narrow, hump Narrow, hump Broad, large, Broad, low, Broad, large, segment dor like, in proximal like, in proximal semicircular, distinctly semicircular, sal flap part, distinctly part, distinctly distinctly longer than distinctly shorter than half shorter than half longer than half length of longer than length of termi length of termi half length of terminal seg half length of nal segment nal segment terminal seg ment terminal segment ment Laevimon kottelati, new species (Figs. 1–3) Material examined. Holotype: male (45.1 by 33.4 mm) (ZRC 2004.695), unnamed stream on road from National Park HQ to Gia Luan (Ra Luan), about 1 km, Cat Ba Island, Hai Phong, northern Vietnam, coll. M. Kottelat et al., 25 Sep. 1998. Paratypes: 1 female (44.9 by 33.5 mm) (ZRC 2004.696), unnamed stream on road from National Park HQ to Gia Luan, about 2–3 km, northern Vietnam, coll. M. Kottelat et al., 26 Sep. 1998; 3 males (largest 27.6 by 20.9 mm) (ZRC 2004.697), Cat Ba Island, 20 º 4757 ” N 107 º00’05” E, northern Vietnam, coll. T. Whitten, 1998. Description. Carapace (Fig. 2 A, B) distinctly transverse, 1.32–1.35 times broader than long, high; dorsal surface strongly convex longitudinally and transversely, glabrous; regions indistinct; cervical grooves faint; Hshaped groove also indistinct. Epigastric cristae poorly developed, rounded, smooth, very weakly separated by faint groove, slightly anterior to postorbital cristae, confluent with postorbital cristae; postorbital cristae indistinct, straight, rounded, smooth, confluent with epibranchial teeth; regions behind epigastric and postorbital cristae smooth. Frontal margin very gently sinuous, cristate; frontal region strongly deflexed downwards, smooth; antennular fossae slitlike when viewed from front; supraorbital margin very gently sinuous, cristate; infraorbital margin straight, cristate; orbital region relatively narrow; eyes normally developed; subhepatic and subbranchial regions rugose. External orbital angle well developed, acutely triangular, outer margin subequal to inner margin, margins cristate, with shallow, narrow, rounded cleft separating it from epibranchial tooth; epibranchial tooth weak, low, rounded; anterolateral margin strongly convex, indistinctly cristate, almost smooth, entire, not confluent with posterolateral margin, running inwards posteriorly; posterolateral margin strongly converging posteriorly, entire, gently convex; branchial region smooth, inflated; metabranchial region smooth, lacking oblique striae. Epistome with median triangle on anterior margin; median tooth on posterior margin very low, broadly triangular, lateral and outer parts forming continuous sinuous margin, with gently concave outer parts and convex lateral parts; median endostomial ridge hardly visible (Fig. 2 B). Third maxilliped glabrous; ischium broadly rectangular, with distinct longitudinal median sulcus; merus squarish, subequal to half of ischium length, with concave outer surface, with smooth margins; palp threesegmented, with tip exceeding proximal margin of merus, lacking any distinctive feature; exopod long, exceeding distal margin of ischium, straight, distally tapered, inner margin of distal part produced as a tooth, flagellum well developed, longer than or subequal to width of merus (Figs. 2 B, 3 A). Chelipeds unequal, outer surface of merus, carpus and palm weakly rugose; fingers strongly gaping, longer than palm, tips hooked and overlapping, carpus armed with robust, obliquely directed subdistal spine on inner margin; merus without subterminal spine (Fig. 2 A). Chelipeds similar in males and females. Ambulatory legs glabrous, relatively short and stout; dactyli elongated, slender; merus unarmed, with upper margin weakly serrated; dactylus of fourth ambulatory leg about 1.3 times as long as propodus, about 6.2 times longer than proximal width; propodus, carpus and merus rugose (Fig. 2 A). Suture between thoracic sternites 2 and 3 distinct, complete, straight; groove or suture between thoracic sternites 3 and 4 demarcated by distinct, strong, complete ridge, fused with tip of margin of abdominal cavity; thoracic sternites 5 and 6 medially interrupted; thoracic sternite 7 completely separated by longitudinal median line; thoracic sternite 8 completely separated by longitudinal median line, lacking transverse ridge; abdominal cavity reaching imaginary line joining median part of coxae of chelipeds (Figs. 1, 2 C). Male abdomen narrowly triangular; telson narrowly triangular, longer than or subequal to proximal width, slightly longer than sixth segment, lateral margins gently concave, tip rounded, proximal margin almost straight; segment 6 elongate rectangular or trapezoidal, median length about half of proximal width, proximal margin almost straight, lateral margins convex; lateral margins of segments 3 to 5 convex (Fig. 2 C). G 1 gently sinuous, slender; terminal segment clearly separated from subterminal segment, relatively short and stout, about 0.3 times length of subterminal segment, subcylindrical, straight, without longitudinal torsion, without swelling on inner margin, dorsal flap present in proximal part, relatively high, narrow, humplike, tip truncate with inner distal angle produced as sharp, narrow projection; groove for accommodation of G 2 marginal; subterminal segment slender, not distinctly constricted or necklike distally, without shelf on upper part of outer margin (Fig. 3 B–E). G 2 with distal segment distinctly longer than half of basal segment, slender, tapering distally, without distal projection; outer margin of basal segment gently convex (Fig. 3 F). Etymology. The species is named after its collector, Dr. Maurice Kottelat. Remarks. Laevimon kottelati, new species, is very similar to L. tankiense (Dang & Tran, 1992). Laevimon kottelati can, however, still be easily separated from L. tankiense by the differences of the carapace and G 1: i) carapace relatively less broad, 1.32–1.35 times broader than long (versus carapace broader, 1.43–1.52 times broader than long); ii) anterolateral and posterolateral margins relatively less strongly convex and less strongly converging, respectively (versus anterolateral and posterolateral margins relatively more strongly convex and more strongly converging, respectively); iii) cleft separating external orbital angle and epibranchial tooth relatively narrower, less distinct (versus cleft relatively broader, more distinct); iv) epibranchial tooth relatively lower and weaker (versus epibranchial tooth relatively higher and more strongly developed); v) ridge demarcating suture between thoracic sternites 3 and 4 complete, fused with tip of margin of abdominal cavity (versus ridge demarcating suture between thoracic sternites 3 and 4 incomplete, broken medially, not fused with tip of margin of abdominal cavity); vi) male abdominal segment 6 lateral margins distinctly convex (versus male abdominal segment 6 lateral margins very gently convex to almost straight); vii) G 1 terminal segment relatively more slen der, with a relatively higher and narrower dorsal flap (versus G 1 terminal segment relatively stouter, with a relatively lower and broader dorsal flap); and viii) G 1 subterminal segment is relatively more slender (versus subterminal segment relatively broader) (Figs. 2–6). Ecological note. The specimens of Laevimon kottelati were collected from along the stream banks as well as a short distance from the streams (M. Kottelat, pers. comm.). This semiterrestrial habit is unusual for freshwater crabs with such carapace physiognomy (high, swollen carapace), instead normally being associated with more terrestrial forest habitats (e.g., Terrapotamon abbbotti, Thaiphusa sirikit, Thaipotamon chulabhorn, Pudaengon spp.) or poorlyoxygenated aquatic habitats (e.g., Somanniathelphusa spp.) (Naiyanetr 1992, 1993; Ng 1993; Ng & Naiyanetr 1993, 1995, 1998; Ng & Kosuge 1997; pers. observ.). Distribution. Hai Phong, northern Vietnam. Laevimon tankiense (Dang & Tran, 1992) (Figs. 4–6) Orientalia tankiensis Dang & Tran, 1992: 19, Fig. 2; Dang & Ho, 2001: 74, Fig. 9. Hainanpotamon tankiensis.— Yeo & Ng, 1999: 641. Material examined. Holotype: male (40.0 by 26.4 mm) (VNCNST), Tan Ky District, Nghe Tinh Province, northern Vietnam, coll. Jul. 1987. Paratype: 1 female (33.5 by 23.4 mm) (VNCNST), same data as holotype. Diagnosis. Carapace distinctly transverse, 1.43–1.52 times broader than long, high; dorsal surface strongly convex longitudinally and transversely, smooth; epigastric cristae very weak, indistinct; postorbital cristae indistinct, rounded; external orbital angle acutely triangular, separated from epibranchial tooth by distinct, broad rounded cleft; epibranchial tooth low but distinct, rounded; anterolateral and posterolateral margins very strongly convex and strongly converging, respectively. Third maxilliped exopod reaching beyond distal margin of ischium, flagellum well developed, subequal to or exceeding width of merus. Ambulatory dactyli long, slender. Suture between thoracic sternites 3 and 4 demarcated by strong incomplete ridge, not fused with tip of margin of abdominal cavity. Male abdomen narrowly triangular; segment 6 with lateral margins very gently convex. G 1 terminal segment about 0.3 times length of subterminal segment; subcylindrical, straight, tip truncate with inner distal angle produced as sharp, narrow projection, with narrow, humplike, dorsal flap in proximal part; subterminal segment relatively slender. G 2 with distal segment longer than halflength of basal segment. Remarks. Laevimon tankiense (Dang & Tran, 1992) differs from its only congener, L. kottelati, new species, by several characters of the carapace, thoracic sternum and G 1 (see Remarks for Laevimon kottelati). The first author examined the types of this species while visiting the VNCNST but, unfortunately, was unable to illustrate specimens. Dang & Tran’s (1992) figure 2 and Dang & Ho’s (2001) figure 9 are therefore reproduced here in Figs. 5 and 6 for comparison. Although the drawings by Dang & Tran (1992) and Dang & Ho (2001) are rather diagrammatic, they nevertheless agree relatively well with the types reexamined. Dang & Tran’s (1992: fig. 2) drawing of the G 1 was made with the structure tilted on its side and hence their figure may be somewhat misleading. In any case, the G 1 of L. kottelati, when viewed and compared from all possible orientations, neither matches the G 1 of the holotype examined by the first author nor the published illustrations of L. tankiense (Dang & Tran 1992, Dang & Ho 2001). Therefore, we are certain that we are dealing with interspecific differences between L. kottelati and L. tankiense. Ecological note. The species occurs in streams in hilly or mountainous areas (Dang & Ho 2001). Distribution. Thanh Hoa Province, northern Vietnam; Nghe Tinh Province, central Vietnam (Dang & Tran 1992).Published as part of Yeo, Darren C. J. & Ng, Peter K. L., 2005, On a new genus and species of freshwater crab from Vietnam, with comments on the nomenclatural status of Orientalia Dang, 1975 (Crustacea: Brachyura: Potamidae: Potamiscinae), pp. 1-15 in Zootaxa 917 on pages 2-11, DOI: 10.5281/zenodo.17106
A new upper bound on the total domination number in graphs with minimum degree six
No full textA total dominating set in a graph G is a set of vertices of G such that every vertex is adjacent to a vertex of the set. The total domination number γt(G) is the minimum cardinality of a dominating set in G. Thomassé and Yeo (2007) conjectured that if G is a graph on n vertices with minimum degree at least 5, then [Formula presented]. In this paper, it is shown that the Thomassé–Yeo conjecture holds with strict inequality if the minimum degree at least 6. More precisely, it is proven that if G is a graph of order n with δ(G)≥6, then [Formula presented]. This improves the best known upper bounds to date on the total domination number of a graph with minimum degree at least 6.</p
Footprinting SHAPE-eCLIP reveals transcriptome-wide hydrogen bonds at RNA-protein interfaces. Corley et al.
No full textEMSAs testing binding of candidate iron response elements by iron response proteins, and RT-qPCR measuring transcript level response of these candidates to various cellular iron conditions
Perfect Forests in Graphs and Their Extensions
No full textLet G be a graph on n vertices. For i ∈ {0,1} and a connected graph G, a spanning forest F of G is called an i-perfect forest if every tree in F is an induced subgraph of G and exactly i vertices of F have even degree (including zero). An i-perfect forest of G is proper if it has no vertices of degree zero. Scott (2001) showed that every connected graph with even number of vertices contains a (proper) 0-perfect forest. We prove that one can find a 0-perfect forest with minimum number of edges in polynomial time, but it is NP-hard to obtain a 0-perfect forest with maximum number of edges. We also prove that for a prescribed edge e of G, it is NP-hard to obtain a 0-perfect forest containing e, but we can find a 0-perfect forest not containing e in polynomial time. It is easy to see that every graph with odd number of vertices has a 1-perfect forest. It is not the case for proper 1-perfect forests. We give a characterization of when a connected graph has a proper 1-perfect forest
Sinopotamon mayangense Naruse, Yeo & Zhou, 2008, spec. nov.
No full textSinopotamon mayangense spec. nov. (Figs. 10–12) Material examined. Holotype: male, 26.5 × 33.4 mm, NCU MCP 2008.0006, Jinjiang River, Xueli Village (ca. 27 ° 49 ’ 0 1 ’’N 109 ° 48 ’ 0 3 ’’E), Gaocun Rural, Mayang Miao autonomous county, Hu’nan Province, China, coll. Huilin Duan & Xianmin Zhou, 26 Jul. 2005. Paratypes: 1 male, 21.7 × 26.7 mm, 7 females, 21.9 × 27.4 – 24.9 × 31.5 mm, NCU MCP 2008.0007, data same as holotype; 2 males, 26.9 × 34.6, 26.9 × 33.2 mm, 4 females, 23.8 × 29.4 – 28.6 × 36.6 mm, ZRC 2008.0015, data same as holotype; 3 males, 22.9 ×28.0– 24.5 × 30.2 mm, 2 females, 21.6 × 28.1, 24.6 × 31.4 mm, NMNS- 5752 -001, data same as holotype. Description. Carapace (Fig. 10 a) broader than long, widest across middle of anterolateral margins, CW 1.22–1.30 times (mean 1.26, n = 12) CL; dorsal surface flat, smooth; epigastric, postorbital cristae oblique; cervical, H-shaped gastric grooves shallow, indistinct; anterolateral region with elongated granules. Front gently directed downwards, anterior margin straight, frontal region granulated. Supra-, infraorbital margins (Fig. 10 b) cristate, lined with small granules, only inner part of suborbital region, anterior part of pterygostomial region with granules. External orbital angle directed anterior-inward, outer margin about 3 times longer than inner margin; epibranchital tooth distinct, anterolateral margin convex laterally, granules distinct. Antennular fossa rectangular; epistome with posterior margin cristate, lined with granules, with sharp triangular median tooth. Palp of mandible three-segmented, with terminal segment simple. Third maxilliped (Figs. 10 b, 11) rectangular, midlength of ischium about 2 times that of merus, exopod reaching proximal two-fifths of outer margin of merus, flagellum long, slightly shorter than width of merus. Thoracic sternites 2, 3 demarcated by unevenness, suture between sternites 3, 4 indiscernible. Abdominal cavity reaching imaginary line joining posterior quarter of cheliped coxae, cavity relatively wide, distance between inner ends of sutures between thoracic sternites 4, 5 longer than third length of distance between sternal condyles; sternal condyle on slightly below middle of thoracic sternite 5; thoracic sternite 8 demarcated medially by uninterrupted longitudinal median line, without transverse ridge at inner ends of sutures between thoracic sternites 7, 8. Cheliped (Fig. 10 a) slightly asymmetrical, major cheliped stouter, longer than minor; merus granulated on dorsal, ventral margins; carpus with strong, sharp inner angle, small tooth below angle; palm smooth, height shorter than length; fingers as long as palm, gape narrow when closed, cutting edge lined with low teeth. Ambulatory legs (Fig. 10 a) moderately long, surfaces rough, anterior margin of meri lined with obtuse low teeth, moderately long, second, third longest when stretched laterally; dactyli as long as respective propodi in P 2 –P 4, slightly shorter in P 5. Abdomen (Fig. 11) with regularly divergent lateral margins, first abdominal segment with transverse ridge; third segment widest; telson with lateral margins concave proximally, width 1.26 times length (n = 1), 1.29 times (n = 1) longer than sixth segment, sixth segment width 2.21 times length (n = 1). G 1 (Figs. 12 a, b) stout; proximal outer part of subterminal segment concave; outer ventral layer of subterminal segment with suture along inner margin, distal part of subterminal segment raised ventrally, distodorsal part concave medially, boundary between subterminal, terminal segments membrane-like; distal segment length quarter of total G 1 length, strongly bent inwards, opening on subdistal part of anterior surface. G 2 (Fig. 12 c) as long as G 1, flagellum ribbon-like, about three-fifths length of narrowed part of basal segment. Distribution and habitat. Sinopotamon mayangense spec. nov. is found from the type locality (Gaocun Rural, Mayang Miao autonomous county, Hu’nan Province, China;> 200m asl. ) Hu’nan (mayang) The species was found from under screes in a rivulet. Remarks. Sinopotamon mayangense spec. nov. is similar to S. bilobatum Dai & Jiang, 1991, and S. nanlingense Dai & Jiang, 1991, in the short, stout and bent distal segment of the G 1 of the three species. Sinopotamon mayangense, however, can be distinguished from S. bilobatum by the strong bent (ca. 60 °) of the terminal segment of the G 1 [vs. blunt and less bent (ca. 45 °)], a tapering tip of the terminal segment (vs. bilobate distal tips), and the subdistal opening of the terminal segment (vs. opening distal) [Figs. 12 a, b; Dai & Jiang 1991: Fig. 2 (3, 4); Dai 1999: Fig. 123 (4, 5)]. Sinopotamon mayangense can be differentiated from S. nanlingense by the strongly bent (ca. 60 °) terminal segment of the G 1 [vs. less bent (ca. 45 °)] and rounded outer margin of the terminal segment of the G 1 (vs. distal third narrowed, so that the lateral margin is angular) [Figs. 12 a, b; Dai & Jiang 1991: Fig. 3 (3, 4); Dai 1999: Fig. 173 (4, 5)].Published as part of Naruse, Tohru, Yeo, Darren C. J. & Zhou, Xianmin, 2008, Five new species of freshwater crabs (Crustacea: Decapoda: Brachyura: Potamidae) from China, pp. 49-68 in Zootaxa 1812 on pages 60-62, DOI: 10.5281/zenodo.18278
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