148,958 research outputs found
Interview with Dung Nguyen, 1989
No full textBorn in South Vietnam, Nguyen explains how his family escaped by boat during the Vietnam War, preserves and shares their culture at the Texas Folklife Festival
Figure 1 from: Nguyen CH, Nguyen LV, Nguyen KS, Egorov AA, Averyanov LV (2021) Hemiboea chanii (Gesneriaceae), a new species from limestone areas of northern Vietnam. PhytoKeys 183: 108-114. https://doi.org/10.3897/phytokeys.183.69180
No full textFigure 1 Hemiboea chanii C.H.Nguyen & Aver., sp. nov. A plants in natural habitat B leaf blade, abaxial surface C flowering branch D flower, frontal view E–G flower, side and half side views H stamens and staminodes I involucre J flower inside and outside views K ripening capsule, cross section L-M pistil and ripening capsule, side view N calyx segments. Photos by Nguyen Van Ly, correction and design by C.H. Nguyen
Metaphire planatoides Nguyen & Nguyen & Lam & Nguyen 2020, new species
No full textMetaphire planatoides, new species (Figs. 1, 4) Material examined. Holotype: 1 mature (CTU-EW.171. h01), natural forests (10°24′21.7″N, 107°16′18.2″E), Long Hai town, Long Dien District, Ba Ria-Vung Tau Province, 33 m asl, 25 October 2016, coll. Nguyen Phuc Hau. Paratypes: 2 matures (CTU-EW.171.p02), same data as holotype. Diagnosis. Small-sized worm, length 64–67 mm, average diameter 2.4–2.8 mm. Body colourless, pale, except light brown clitellum. Prostomium epilobous. First dorsal pore in 11/12. Two pairs of spermathecal pores in ventral intersegments 6/7/8. Male pores located deeply inside copulatory pouches in the setal ring xviii. Genital markings totally absent. Holandric. Intestinal caeca simple. Septa 8/9/10 absent. Description. Body cylindrical, small size, length 64–67 mm, average diameter 2.4–2.8 mm, weight 0.18–0.32 g, segments 89–96. Body colourless, pale except light brown clitellum. Prostomium 1/2 epilobous. First dorsal pore in 11/12. Preclitellar setae stouter and sparser than post-clitellar ones; setal number 39–41 in viii, 51–55 in xxx, 7–9 between two openings of copulatory pouches in xviii; setal distance aa=ab, zz=zy. Clitellum close, xiv–xvi, with only ventral setae, without dorsal pores. Female pore single, in midventral xiv. Two pairs of spermathecal pores in ventral intersegments 6/7/8. No genital markings in spermathecal region. Male pores located deeply inside copulatory pouches in the setal ring xviii. Ventral distance between two openings of copulatory pouches ca. 0.35× body circumference. No genital markings in male region. Septa 5/6/7/8 thick, 8/9/10 absent, 10/11/12/13 thin. Oesophageal gizzard within viii–ix. Intestinal origin at xv; caeca simple, paired in xxvii–xxv. Last hearts in xiii. Pharyngeal micronephridia developed in 5/6/7. Typhlosole simple, lamelliform. Lymph glands absent. Two pairs of spermathecae in vii and viii. Ampulla mangoshaped; duct small, about ⅓ ampulla length. Diverticula long, but waved and folded, directly attached to the base of ampulla duct; seminal chamber tiny, oval-shaped. Spermathecal ducts without nephridia. Accessory glands absent. Holandric. Testis sacs developed in x–xi, connected. Seminal vesicles developed in xi–xii. Ovaries developed in 12/13. Ovisacs invisible. Prostate glands deeply lobuled, paired in xvii–xx; ducts short, C-shaped. No accessory glands. Etymology. The epithet " planatoides " is used to emphasise its similarity to Metaphire planata (Gates, 1926). Remarks. Metaphire planatoides, new species, is assigned to the Metaphire planata group characterised by having two pairs of spermathecal pores in 6/7/8 and simple intestinal caeca (Sims & Easton, 1972). The planata group currently consists of at least six species, M. planata (Gates, 1926), M. decipiens (Beddard, 1912), M. dunckeri (Michaelsen, 1902), M. ferdinandi (Michaelsen, 1891), M. parvula (Ohfuchi, 1956), and M. sintangi (Michaelsen, 1922). The new species differs from these species except M. planata in the absence of genital markings in both spermathecal and male regions. Metaphire planatoides, new species, is somewhat similar to M. planata, in having the first dorsal pore in 11/12, the absence of genital markings in both spermathecal and male regions, and the shape of the openings of copulatory pouches. However, it is distinguished by the absence of accessory glands in the spermathecal region, spermathecae with thin ducts, strongly waved diverticula, connected seminal vesicles, and its smaller size (length = 67 mm, diameter = 2.4–2.8 mm). On the contrary, M. planata has several accessory glands with long ducts, spermathecae with stout ducts, diverticulum straightly cylindrical, somewhat slightly expanded distally, separated seminal vesicles, and a larger size (length = 125 mm, diameter = 4.8 mm).Published as part of Nguyen, Tung T., Nguyen, Nam Q., Lam, Dang H. & Nguyen, Anh D., 2020, Six new species of the genus Metaphire Sims & Easton, 1972 (Annelida: Oligochaeta: Megascolecidae) from southeastern Vietnam, pp. 220-236 in Raffles Bulletin of Zoology 68 on page 228, DOI: 10.26107/RBZ-2020-0019, http://zenodo.org/record/457721
Antheromorpha pumatensis Nguyen & Nguyen & Le 2018, new species
No full textAntheromorpha pumatensis, new species (Figs. 6−9, 10) Material examined. Holotype: 1 male (IEBR-461H) Nghe An Provinve, Pu Mat National Park, Khe Thoi (19°04′47.7″N; 104°38′13.7″E); forest, 4−10 April 2011, coll. Anh. D. Nguyen. Paratypes: 2 males, 4 females (IEBR-461P) same data as sample IEBR-461H; 1 male, 2 females (IEBR-462), same locality, but Thac Chem (18°58′17.4″N; 104°48′02.9″E); forest, 4−10 April 2011, coll. Anh. D. Nguyen. Diagnosis. This species differs from its congeners by having: metaterga with a median yellowish brown stripe, paraterga pink, tip of gonopod strongly divided into two processes: one being spiniform, the other being a serrated lobe. Etymology. Named after the locality where the type specimens were collected. Description. Body length about 28.1−37.4 mm (male); 28−36.5 mm (female); width of midbody pro- and metazona 2.3−2.9 mm (male); 2.9−3.4 mm (female) and 3.5−4.1 mm (male); 3.7−4.5 mm (female); respectively. Holotype length ca. 28.1 mm, width of midbody pro- and metazona 2.3 mm and 3.5 mm, respectively. Prozona and metaterga with a median broad pink stripe and two paramedian castaneous/blackish brown regions (Figs. 6, 7). Paraterga pink or red (both dorsal and ventral sides). Pleura, head, distal part of antennomere 6 and whole antennomere 7 blackish brown. Antennae, sterna, and legs light brown. Head (Fig. 7A− C) slightly broader than collum; clypeolabral region sparsely setose. Frons weakly convex, divided into 2 parts by a distinct epicranial suture. Antennae (Fig. 7B, C) claviform, reaching metatergum 3 if stretched dorsally. Most antennomeres subequal in length except for the shortest antennomeres 1 & 7. Collum (Fig. 7A) slightly narrower than body ring 2. Surface smooth and shining. Paratergum modestly developed, earshaped or subtriangular with broadly rounded anterior corner. Lateral side without setiferous incision. Body ring (Fig. 7A− F) 3<4<2= 5−16 in width, thereafter gradually tapering towards telson. Prozona shining and smooth. Metaterga shining, almost smooth except lateroposterior area faintly rugose. Transverse sulcus incompletely present on metatergum 4; well present, thin, distinct on metaterga 5−19, but not reaching base of paraterga. Metaterga with traces of rows of 2+2 and 5+5 setae in front of and behind transverse sulcus, respectively. The second row located near posterior margin. Axial line thin, brown, present on all prozona and metaterga. Pleura considerably rugose, with dense microgranules. Pleurosternal carinae present as a full crest with a small caudal tooth on body rings 2−4; reduced to a small caudal denticle on body rings 5−14 (male); on body rings 5−11 (female); and absent on subsequent body rings. Paraterga (Fig. 7A, B, D−G) well developed, sub-horizontal, set lower than metatergal surface; thin, like blunt blades, but thicker on pore−bearing body rings from lateral view. Paratergum 2 subsector-shaped, with anterior and posterior corners rounded. Paraterga 3−4 shorter than others; caudal corners weakly acute, but not pointed. Caudal corners of paraterga 5−15 strongly acute, pointed, but more protruding on paraterga 15−19. Paraterga 16−19 with a small hook at caudal corners. Calluses small, narrow in both poreless and pore-bearing paraterga, with two setiferous incisions at 1/3 and ½ length of paraterga laterally. Paraterga exceeding posterior contour on body rings 16−19 (female) and on body rings 13−19 (male). Ozopores located on a small depression at 2/3 of paratergal length laterally. Legs (Fig. 7E, G) long and slender, about 1.1−1.3 (females) 1.3−1.6 (males) times as long as midbody height. Tarsal brushes present on legs 1−11, thinner on legs 12−15 (male); thereafter missing on subsequent legs. Prefemora not swollen. Femora without modifications. Sterna sparsely setose, without modifications except for the fifth sternum with a median pair of separately, but contiguously elevated setiferous conical processes between coxae 4 (Fig. 7L). Epiproct (Fig. 7K) long, broadly truncated, dorsoventrally flattened, with two small lateroapical tubercles. Tip with four spinnerets. Hypoproct (Fig. 7J) subtriangular with two distolateral, well separated, setiferous knobs. Gonopod (Figs. 8, 9) simple. Coxite cylindrical, shorter than femorite; distoventral part modestly setose. Prefemorite densely setose, about ½ times as long as femorite, set off from femorite by a transverse sulcus laterally. Femorite long, slender, not expanded distally, suberect, demarcated from postfemoral region by an oblique sulcus laterally, with evidence of weak torsion basally. Flagelliform solenomere almost sheathed by solenophore. Tip of gonopod strongly divided into two processes, one being lanceolate process (D); the other with serrated lobe (m) and a distal minute process (v). Remarks. Like Anthromorpha paviei, the new species is not typical for the genus Antheromorpha. It seems to be an intermediate species between Orthomorpha and Antheromorpha. In comparison to other Antheromorpha species, A. pumatensis, new species is differentiated by the colour pattern (red or brownish red); large size, and more importantly by gonopod conformation. The gonopod of the new species is long, slender and erect; tip deeply bifid, but the process (d) shorter than in other species, and process (m) serrated apically with short tubercle (v). The species is only known from its type locality in central Vietnam.Published as part of Nguyen, Anh D., Nguyen, Son G. & Le, Son X., 2018, On the millipede genus Antheromorpha Jeekel, 1968 (Diplopoda: Polydesmida: Paradoxosomatidae) from Vietnam, with a description of a new species, pp. 96-109 in Raffles Bulletin of Zoology 66 on pages 100-104, DOI: 10.5281/zenodo.450327
Rhopalomeris nagao Nguyen & Nguyen & Eguchi 2021, sp. nov.
No full textRhopalomeris nagao sp. nov. (Figs 2–5) Material examined. Holotype. 1 male (IEBR-Myr 854H) Vietnam, Cao Bang Province, Pia Oac – Pia den National Park, on the trail to the peak, near Lung Pham mining site, N22.6082 – E105.8693, elev. 1,600m, natural forest, 7 June 2020, leg. Anh D. Nguyen. Paratypes. 3 males (IEBR-Myr 854P) same data as for the holotype; 1 male (IEBR-Myr 852) same locality as the holotype, but on the trail to Hang Ong, N22.5540 – E105.8622, elev. 850m, 8 June 2020, leg. Anh D. Nguyen. Diagnosis. The new species can be recognized by the following combination of characters: antennal tip with numerous sensory cones; telopods with short prefemoral and femoral trichosteles, with long, straight and acute tuberculiform distomesal femoral process, and shorter lobuliform distolateral tibial process; syncoxial lobe being slightly concave medially; syncoxial horns being longer than lobe. The new species differs from R. variegata Golovatch & Semenyuk, 2016 (from Highlands of Vietnam) and R. sauda Nguyen, Sierwald & Marek, 2019 (from northern Vietnam) in colouration (black colour plus several yellow spots (R. nagao sp. nov.) vs. variegated colour (R. variegata) vs. yellow colour plus black spots (R. sauda)). The new species also differs from R. sauda in length of trichosteles (short in R. nagao sp. nov. vs. long in R. sauda), shape of syncoxial lobe (slightly concave medially (R. nagao sp. nov.) vs. slightly convex medially (R. sauda)) and shape of femoral and tibial processes (long, straight and acute tuberculiform femoral process (R. nagao sp. nov.) vs. large tuberculiform process with bowed distal part (R. sauda); shorter lobuliform tibial process (R. nagao sp. nov.) vs. a long, sigmoid mesad, acute tuberculiform process (R. sauda)). Moreover, femoral process of telopods lacks a membranous apical sac which is clearly observed as in R. carnifex and R. variagata. Another species, R. tonkinensis Silvestri, 1917, was described from female specimens, the male remains unknown. However, the new species is clearly distinguishable from R. tonkinensis by the colour pattern (black plus yellow spots vs. mostly black in R. tonkinensis), number of ocelli (7+1 vs. 8+1), and number of striae on thoracic shield (10–11 vs. 7). Etymology. “ nagao ”, noun in apposition, refers to the Nagao Environmental Foundation of Japan which significantly contributes to the biodiversity inventory and conservation in Vietnam. Description. Holotype length ca. 12.9 mm, width of thoracic shield ca. 5.4 mm. Terga black with a yellow broad median line or yellow triangular median spot on terga 3–5, and with four yellow lateral spots forming two oval marbled spots laterally (Fig. 2A, B). Thoracic shield with similar color pattern to other terga, but smaller spots (Fig. 3A). Anal shield (= pygidium) with a yellow large triangular spot caudomedially (Fig. 3B). Ocelli 7+1 (Fig. 2C), lenses convex, black contrasting against light brown background of head. Tömösváry organs transverse strongly horseshoe-shaped, 2X as long as wide (Fig. 2C). Antenna clavate, antennomere 6 largest and longest, 1.7–1.8X long as wide. Antennal tip with numerous apical sensory cones (Fig. 3C, D). Collum semicircular, light brown, with a marbled yellow-brown, transverse oval spot in the middle, with two distinctly transverse striae (Fig. 2D). Second tergum with a narrow hyposchism, not reaching to caudal margin, with 10–11 striae; other terga with a stria distolaterally. Anal shield rounded, not concave medio-caudally (Fig. 3B). Leg pair 17 strongly reduced, with 4 podomeres, with a high, regularly rounded outer coxal lobe; coxa with an apical setiferous spine (Fig. 4A); podomere 4 with an apical seta. Leg pair 18 also strongly reduced as legs of legpair 17, with 4 podomeres, with a simple V-shaped syncoxial notch (Fig. 4B). Telopods (Figs 4C, D, 5) with a trapeziform, slightly concave medially, sparsely setose, central syncoxial lobe accompanying two setiferous horns, each directed ventrad, longer than syncoxial lobe. Prefemur and femur with short trichosteles. Prefemur without additional processes. Femur with a large, long, straight-directed and acute tuberculiform distomesal process. Tibia with a shorter lobuliform distolateral process. Tarsus slightly sigmoid anteriomesad, subacuminate apically, with a seta distoventrally. Variation. Length from 11.1–15.5 mm, width of thoracic shield varies 5.4–7.8 mm. Two paratypes have 6+1 ocelli. DNA barcode. COI barcode data (partial) for the paratypes has been uploaded to GenBank under the accession numbers MT749392 and MT749411. The new species shares 89.25% and 83.2% identity with Glomeridella minima and Trachysphaera sp., respectively.Published as part of Nguyen, Anh D., Nguyen, Son G. & Eguchi, Katsuyuki, 2021, A new Rhopalomeris species (Diplopoda: Glomerida: Glomeridae), and notes on the phylogenetic relationships between glomeridans in Vietnam, pp. 257-264 in Zootaxa 4927 (2) on pages 259-263, DOI: 10.11646/zootaxa.4927.2.5, http://zenodo.org/record/453707
Metaphire mangophiloides Nguyen & Trinh & Le & Nguyen 2015, new species
No full textMetaphire mangophiloides Nguyen & Le, new species (Fig. 3, Table 3) Examined material. Holotype: 1C (CTU.EW082–h01) Acacia plantation, Thien Tam community, Vinh Cuu District, Dong Nai Province, Vietnam (11 o 15’54.7” N; 107 o 03’52.7” E), 13 September 2012, coll. Duong Chi Trong. Paratype: 1C (CTU.EW082–p01) same data as for holotype. Diagnosis. Worm medium-size, length 70–74 mm, diameter 5.25–5.31 mm. Number of setae higher in pre-clitellar than post-clitellar region; setae distance aa = 1.2 ab, zz = 1.3 yz. First dorsal pore in 12/13. Multiple spermathecal pores lateroventral in intersegment 5/6. No genital markings in both spermathecal and male regions. Holandric. Intestinal caeca manicate. Septa 8/9/10 absent. Etymology. Named to emphasise its similarity with the species Metaphire mangophila (Nguyen, 2011). Description. External characters: Body cylindrical, medium size; length 70–74 mm, diameter 5.25–5.31 mm, segments 71–78, weight 0.94–1.28 g. Body greyish brown dorsally and paler ventrally. Number of setae higher in pre-clitellar than post-clitellar region, 68–69 in v, 62–70 in viii, 60–63 in xxv, 56–62 in xxx, 17–20 between male porophores in xviii; setae distance aa = 1.2 ab, zz = 1.3 yz. Prostomium 1/3 epilobous. First dorsal pore in 12/13. Clitellum annular, xiv-xvi, smooth, without setae and dorsal pores. Female pore single, mid-ventral in xiv. Spermathecal pores tiny, multiple, lateroventral in intersegments 5/6. Male pores deeply located inside copulatory pouches in xviii; ventral distance between male porophores about 0.3× body circumference. Copulatory pouches having small, O-shaped openings. No genital markings in both spermathecal and male regions. Internal characters: Septa 5/6/7/8 thickened, 8/9/10 absent. Oesophageal gizzard within viii–x. Intestinal origin at xv; caeca manicate, within xxvii–xxv. Last hearts in xiii. Pharyngeal micronephridia in 5/6/7. Lymph glands absent. Typhlosole simple, lamelliform. Fifteen spermathecae in intrasegmental 5/6: 6–8 on the left side and 7–9 on the right side. Ampulla opalescent, subcylindrical, but slightly enlarged distally; duct extremely short, about 1/10 of ampulla length. Diverticula waved and short, about 1/3 ampulla, attached directly to ampulla duct. Accessory glands absent in spermathecal region. Holandric. Testis sacs not separated. Seminal vesicles well developed within xi–xii, opalescent. Oviduct on septum 12/13 ventrally; a pair of small ovaries in xiii. Prostate glands large, racemose, paired in xvii–xx; prostatic ducts U-shaped. Accessory glands absent. Habitat and ecology. The new species was found in Acacia tree plantation in Thien Tam commune, Vinh Cuu District, Dong Nai Province. All specimens were collected from soil surface, just under leaf litter at the end of the rainy season. Remarks. This new species is fairly similar to M. mangophila (Nguyen, 2011) and M. bitheca (Kobayashi, 1936) in the following characters: genital makings absent in both spermathecal and male regions, intestinal caeca manicate. However, M. mangophiloides has multiple spermathecal pores in intersegment 5/6, pharyngeal micronephridia not water-drop shaped, ampulla duct extremely short (1/10 ampulla length) whereas M. mangophila (Nguyen, 2011) has two pairs of spermathecal pores in 5/6/7, two spermathecae in each thecal segment, pharyngeal micronephridia water-drop shaped, ampulla duct relatively long (=1/3 ampulla length). M. bitheca is distinguished from new species by two grouped pairs of spermathecal pores on anterior vi and vii with each group consisting of 2+2 pores, large, oval, disc-shaped male porophores, and short, cylindrical spermathecal diverticula (Kobayashi, 1936).Published as part of Nguyen, Tung. T., Trinh, Binh K. T., Le, Nhan V. & Nguyen, Anh D., 2015, On the polythecate earthworms of the genus Metaphire (Oligochaeta: Megascolecidae) from Vietnam, with descriptions of three new species, pp. 461-470 in Raffles Bulletin of Zoology 63 on pages 467-469, DOI: 10.5281/zenodo.538580
Analogues 5-Aza d'angucyclines : Première synthèse et évaluations" Q. Vu Nguyen, S. Collet, A. Guingant, G. Dujardin
No full textCommunication par affiche (présentée par Quang Vu Nguyen,)
Pratique du changement de nom chez les annamites / Nguyen Van To.
No full textCover title.; Includes bibliographical references.; Electronic reproduction. Canberra, A.C.T. : National Library of Australia, 2013
Figure 1 from: Dong L-N, Nguyen KS, Shui Y-M, Nguyen HQ, Xu W, Nguyen XK (2021) Begonia catbensis (sect. Coelocentrum, Begoniaceae), a new species from northern Vietnam. PhytoKeys 179: 1-12. https://doi.org/10.3897/phytokeys.179.65812
No full textFigure 1 Begonia catbensisA plants growing on rocks in the wild B habit C apical shoot bearing stipules D young leaf, abaxial view E part of adaxial leaf surface showing bullae, setae and palmate veins F dendritic hairs on petiole and abaxial veins G portion of leaf showing reddish setae on bullae and along margin. Photos and layout by K.S. Nguyen & L.N. Dong
Figure 2 from: Dong L-N, Nguyen KS, Shui Y-M, Nguyen HQ, Xu W, Nguyen XK (2021) Begonia catbensis (sect. Coelocentrum, Begoniaceae), a new species from northern Vietnam. PhytoKeys 179: 1-12. https://doi.org/10.3897/phytokeys.179.65812
No full textFigure 2 Begonia catbensisA apical part of inflorescence showing peduncle, pedicel, bracts, bracteoles, staminate and pistillate flowers B staminate and pistillate flowers C staminate flower (upper) in front view D stamens E pistillate flower-top view F pistillate flower, lateral view G dissected styles and stigmas H fruits and their cross-cut. Photos and layout by K.S. Nguyen & L.N. Dong
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