320,635 research outputs found
Chrysogorgia ramificans Xu, Li, Zhan & Xu 2019
No full text<i>Chrysogorgia ramificans</i> Xu, Li, Zhan & Xu, 2019 <p>Figs. 46, 47</p> <p> <i>Chrysogorgia ramificans</i> Xu, Li, Zhan & Xu, 2019: 94–97, figs. 2–3.</p> <p> <b>Material examined.</b> MBM286861, station FX-Dive 223 (10°4′42″N, 140°15′12″E), a seamount (tentatively named as M7) on the Caroline Ridge, 1047m, 11 June 2019.</p> <p> <b>Description.</b> Colony typical bottlebrush-shaped and attached to a rocky substrate (Fig. 46 A). Specimen about 36 cm long and 15 cm wide in maximum with the holdfast not recovered (Fig. 46 B). Main stem about 1.5 mm in diameter at base and brown to yellow with metallic luster. Branching sequence 1/ 3L. Branches subdivided dichotomously, up to five orders with branching angle 80°–100°. Distance between adjacent branch 6–12 mm, orthostiche intervals 17–34 mm, the first internode of branch 8–27 mm and the terminal branchlets up to 31 mm. Polyps cylindrical, some of them curved, usually perpendicular to the branches, 1.0– 2.5 mm tall average 2 mm, and 0.5–1.0 mm wide (Fig. 46C, E, F). Polyps up to three and became very small on the first internode, up to four in medial internodes and up to five in terminal branchlets. Polyps absent in stem internodes and verruae absent. Tentacular part 0.5–1.0 mm long with tentacle rachis forming eight obvious columns (Fig. 46E).</p> <p>Rods and spindles in polyp body wall longitudinally or obliquely arranged, large and thick, rarely branched with many large and coarse warts, occasionally with irregular edges and shape, measuring 115–529 × 49–141 μm (Fig. 47D). Rods and spindles in tentacle rachis longitudinally arranged extending to the polyp neck, all covered with many large and coarse warts, some of them branched with irregular shape, measuring 135–459 × 23–106 μm (Fig. 47A). Scales in pinnules transversely arranged, small with finely toothed ends and sparse warts on surface, some of them curved or twisted with a medial contraction, occasionally nearly smooth, measuring 114–148 × 21–60 μm (Figs. 46D, 47B). Scales in coenenchyme arranged along to the branch, elongated and flat with dentate edges and a few large warts, some of them smooth and thick, measuring 223–671 × 35–118 μm (Figs. 46G, 47C).</p> <p> <b>Distribution and habitat.</b> The Kocebu Guyot in Magellan Seamounts, 1831 m (Xu <i>et al.</i> 2019); a seamount on the Caroline Ridge in the Western Pacific, 1047 m.</p> <p> <b>Remarks.</b> The colony of the Caroline specimen has a single bottlebrush-shaped branching part and smaller polyps compared with the holotype, and these differences may be caused by different growth stage or environment, and we treat as the intraspecific variation.</p>Published as part of <i>Xu, Yu, Zhan, Zifeng & Xu, Kuidong, 2023, Studies on western Pacific gorgonians (Anthozoa: Octocorallia, Chrysogorgiidae). Part 1: a review of the genus Chrysogorgia, with description of a new genus and three new species, pp. 1-107 in Zootaxa 5321 (1)</i> on page 76, DOI: 10.11646/zootaxa.5321.1.1, <a href="http://zenodo.org/record/8203414">http://zenodo.org/record/8203414</a>
Lonchodryinus bimaculatus Xu & He 1994
No full text29. Lonchodryinus bimaculatus Xu & He, 1994 ** Lonchodryinus bimaculatus Xu & He, 1994: 128. Material examined. Holotype of L. bimaculatus: Ƥ, China, Sichuan, Mt. Emeisahan, 10.VIII. 1980, Junhua He coll. [ZJUC]. Shaanxi: Liuba, 1742 m, 22.VII. 2004, Qiong Wu coll., 1 3 [ZJUC]. Hosts. Unknown. Distribution. Oriental. China: Sichuan (Xu & He 1994; He & Xu 2002), Shaanxi (new record).Published as part of Xu, Zaifu, Olmi, Massimo, Guglielmino, Adalgisa & Chen, Huayan, 2012, Checklist of Dryinidae (Hymenoptera) from Shaanxi Province, China, with descriptions of two new species, pp. 1-16 in Zootaxa 3164 on page 11, DOI: 10.5281/zenodo.21220
Anteon chui Xu & He 1998
No full text16. Anteon chui Xu & He, 1998 ** Anteon chui Xu & He 1998 a: 90. Material examined. Holotype (3) and paratypes (2 3) of A. chui: China, Zhejiang, Tianmushan National Nature Reserve, 1250–1547 m, 17–18.V. 1988, Weiliang Xu coll., holotype [ZJUC]; same locality as holotype, Ruyou Guo coll., 1 3 paratype [ZJUC]; same locality as holotype, Xiaoming Lou coll., 1 3 paratype [ZJUC]. Guangdong: Conghua City, Liuxihe National Forest Park, 29–31.VIII. 2005, Zaifu Xu coll., 1 3 [ZJUC]; Nanling National Nature Reserve, Protection Station, 21–25.IV. 2011, yellow pan trap, Huayan Chen coll., 4 3 [SCAU]. Hosts. Unknown. Distribution. Oriental. China: Zhejiang (Xu & He 1998 a; He & Xu 2002), Guangdong (new record).Published as part of Xu, Zaifu, Olmi, Massimo, Guglielmino, Adalgisa & Chen, Huayan, 2012, Checklist of Dryinidae (Hymenoptera) from Guangdong Province, China, with descriptions of two new species, pp. 1-28 in Zootaxa 3231 on page 6, DOI: 10.5281/zenodo.21313
Anteon striolaforceps Xu & He 1997
No full text24. Anteon striolaforceps Xu & He, 1997 ** Anteon striolaforceps Xu & He, 1997 c: 6. Material examined. Holotype of A. striolaforceps: 3, China, Zhejiang, Mt. Tianmushan, 23.VI. 1984, Ruliang Zhu coll. [ZJUC]. Shaanxi: Liuba County, Mt. Ziboshan, 1632 m, 4.VIII. 2004, Qiong Wu coll., 1 3 [ZJUC]. Hosts. Unknown. Distribution. Oriental. China: Zhejiang (Xu & He 1997 c), Shaanxi (new record).Published as part of Xu, Zaifu, Olmi, Massimo, Guglielmino, Adalgisa & Chen, Huayan, 2012, Checklist of Dryinidae (Hymenoptera) from Shaanxi Province, China, with descriptions of two new species, pp. 1-16 in Zootaxa 3164 on page 10, DOI: 10.5281/zenodo.21220
Aphelopus albiclypeus Xu, He & Olmi 1999
No full text1. Aphelopus albiclypeus Xu, He & Olmi, 1999 ** Aphelopus albiclypeus Xu, He & Olmi, 1999: 90. Aphelopus querceus: He & Xu 2002: 64. Material examined. Holotype of A. albiclypeus: Ƥ, Yunnan, Anning Hot Spring, 24 °09'N 102 °04'E, 9-13.VI. 1988, Xuexin Chen coll. [ZJUC]. Shaanxi: Zouzhi, Yuanzhenzi, 2-3.VI. 1998, Yun Ma coll., 1 3, reported erroneously as Aphelopus querceus Olmi by He & Xu (2002) [ZJUC]; Liping National Forest Park, 1742 m, 22.VII. 2004, Qiong Wu coll., 1 3 [ZJUC]. Hainan: Baisha, Yinggeling, 1-2.V. 2008, Jingxian Liu coll., 1 3 [SCAU]. Hosts. Unknown. Distribution. Oriental. China: Shaanxi (new record), Yunnan, Hainan (Xu et al. 2011 c).Published as part of Xu, Zaifu, Olmi, Massimo, Guglielmino, Adalgisa & Chen, Huayan, 2012, Checklist of Dryinidae (Hymenoptera) from Shaanxi Province, China, with descriptions of two new species, pp. 1-16 in Zootaxa 3164 on page 2, DOI: 10.5281/zenodo.21220
Some Closed-Form Results for Adhesive Rough Contacts Near Complete Contact on Loading and Unloading in the Johnson, Kendall, and Roberts Regime
No full textRecently, generalizing the solution of the adhesiveless random rough contact proposed by Xu, Jackson, and Marghitu (XJM model), the first author has obtained a model for adhesive contact near full contact, under the Johnson, Kendall, and Roberts (JKR) assumptions, which leads to quite strong effect of the fractal dimension. We extend here the results with closed-form equations, including both loading and unloading which were not previously discussed, showing that the conclusions are confirmed. A large effect of hysteresis is found, as was expected. The solution is therefore competitive with Persson's JKR solution, at least in the range of nearly full contact, with an enormous advantage in terms of simplicity. Two examples of real surfaces are discussed
The Lebesgue constant of the Xu interpolation points
No full textIn the paper \cite{xu3}, the author introduced a set of Chebyshev-like points for polynomial interpolation (by a certain subspace of polynomials) in the square , and derived a compact form of the corresponding Lagrange interpolation formula. In \cite{nostro1} we gave an efficient implementation of the Xu interpolation formula and we studied numerically the Lebesgue constant of the Xu points, giving evidence that it grows like , being the degree. The aim of the present paper is to provide an analytic proof that indeed the Lebesgue constant does have this order of growth
Editorial note - On the aims and scope and priority areas in Materials and Design
No full textAlexander M. Korsunsky, A. Geoffrey Gibson, Giang D. Nguyen, Marco Sebastiani, Xu Song, Tan Su
Cryptomya (Venatomya) sinensis Xu 1987
No full textCryptomya (Venatomya) sinensis (Xu, 1987) Figure 5 A–F Tugonia sinensis Xu, 1987: 438, 441, fig. 1 b—Bernard et al., 1993: 107; Xu, 1997: 230; Lutaenko & Xu, 2008: 52, text-fig. 6 D; Xu & Zhang, 2008: 257, fig. 814; Xu, 2008: 589. Cryptomya (Venatomya) sinensis (Xu, 1987) — Huber, 2010: 766. Material examined. MBM 300741 (no. 84 M- 185) (Holotype) (1 articutate shell), Huian, Fujian Province, China, on July 17 th, 1984. Distribution and habitat. Recent. East China Sea, Yellow Sea, China. Type locality. Huian, Fujian Province, China. Habitat unknown. Diagnosis. Length to 20 mm; shell laterally slightly compressed, thin and fragile; umbo prominent, situated slightly posterior, prosogyrate; sculpture of commarginal growth lines on anterior and anterorcentral shell, and radial ribs posterocentral to posterior, becoming more pronounced towards the posterior; posterior area lacking radial ribs; chondrophore in left valve shallow; pallial sinus shallow and broad, extending slightly beyond the posterior adductor scar; pallial line thin or obscure. Remarks. The shell of this species is slightly compressed and its posterior end is not attenuated as is typical of Tugonia. Our present placement with Cryptomya (Venatomya) coincides with Huber (2010: 766); however, we do not agree with his synonymization with C. (V.) elliptica. Based on our examinations of type specimens of C. (V.) sinensis and material of C. (V.) elliptica, the shell of C. (V.) elliptica is much more compressed than that of C. (V.) sinensis. Comparing shells of similar size, C. (V.) sinensis (MBM 300741, Length = 19.0 mm) is much more fragile, the sculpture stronger, and the umbo much larger and more tumid than in C. (V.) elliptica (MBM 136090, Length = 18.8 mm) (Fig. 5 G).Published as part of Zhang, Jun-Long, Xu, Feng-Shan & Liu, Rui-Yu, 2012, The Myidae (Mollusca, Bivalvia) from Chinese waters with description of a new species, pp. 39-60 in Zootaxa 3383 on page 49, DOI: 10.5281/zenodo.28173
Coilodera grandimaculata Qiu, Xu
No full textCoilodera grandimaculata Qiu, Xu, & Chen, new species (Figs. 15–20, 50, 60–61, 68, 75–76, 85, 94) Diagnosis. This species can be easily separated from other members of the C. penicillata species complex by the combination of the following characters: tomentum orange; male antennal club longer (Fig. 15); scutellum tomentose (Fig. 50); elytra tomentose maculae larger; apex of mesometasternal process rounded (Figs. 60–61); parameres elongate (Fig. 75). Holotype (male). Length: 23.0 mm; width: 9.6 mm. Tomentum on body surface orange. Head and pronotum with wine-red and green metallic reflections; length of antennal club about twice length of antennomeres 2–7 combined. Posterior margin of median tomentose area of pronotum slightly curved. Scutellum fully clad with tomentum (Fig. 50). Posthumeral maculae distinctly larger than lateral maculae. Mesometasternal process short, apex rounded (Fig. 60); mesometasternal suture engraved, with numerous long setae. Pygidium with a large macula in middle. Sides of abdominal sternites 2–6 with tomentose maculae; abdominal sternite 6 with orange, long setae on both sides. Middle of abdomen glabrous, with a distinct groove (Figs. 16–17). Protibia with 3 teeth along outer margin, proximal tooth very small. Outer tooth of metatibia evidently shorter than ventral tooth (Fig. 68). Male genitalia as Figs. 75–76. Allotype, paratypes (8 females). Body length 22.2–23.5 mm; width 10.2–10.3 mm. Similar to male with antennal club much shorter, lateral margin of pronotum slightly angular, posthumeral macula larger, posterior margin of the median tomentose area of pronotum notched, protibia slightly wider (Fig. 18), proximal tooth of protibia and external protrusion of mesotibia much sharper, apex of mesometasternal process slightly protrudent (Fig. 61), middle of abdomen convex, abdominal sternite 6 without tomentose macula (Fig. 19), and abdominal segment 7 more exposed. Type material. CHINA: Xizang: ♂ (Holotype, SWU), 9.VIII.2014, Yarlung Tsangpo Grand Canyon Nature Reserve, Bononggong (80K), Mêdog County, 2,100 m, Wei-Wei Zhang. Paratypes (8♀♀): 1♀ (Allotype, SWU), 17.VIII.2017, Yarlung Tsangpo Grand Canyon Nature Reserve, Bononggong (80K), Mêdog County, 2,100 m, Jian- Yue Qiu & Hao Xu; 2♀♀ (QCCC), 18.VIII.2017, Yarlung Tsangpo Grand Canyon Nature Reserve, Bononggong (80K), Mêdog County, 2,100 m, Jian-Yue Qiu & Hao Xu; 1♀ (QCCC), 13.VII.2017, Yarlung Tsangpo Grand Canyon Nature Reserve, Bononggong (80K), Mêdog County, 2,100 m, Si-Yao Huang; 1♀ (QCCC) 13.VIII.2017, Yarlung Tsangpo Grand Canyon Nature Reserve, Pailong Valley, Pailong, Nyingchi County, 2,050 m, Jian-Yue Qiu & Hao Xu; 3♀♀ (QCCC), VIII.2014, Yarlung Tsangpo Grand Canyon Nature Reserve, Hanmi, Beibeng, Mêdog County, 2,200 m, Wei Hu. Etymology. The specific epithet derived from the Latin adjective grandis (big, large) and the noun maculata (macula), and refers to the large yellow maculae on elytra. Distribution. China: Xizang. Natural history. Coilodera grandimaculata occurs sympatrically with C. penicillata and C. dives in Yarlung Tsangpo Grand Canyon (Brahmaputra Valley), Tibet (Fig. 86). The male holotype was collected under a street lamp at night (Mr. Wei-Wei Zhang, personal communication), and females were found visiting flower of Zanthoxylum sp. (Rutaceae) (Fig. 94) and Hydrangea sp. (Saxifragaceae) at the type locality. Larvae and pupa were also found in decayed wood within the cockroach galleries of Salgunea sp. (Blattodea: Blaberidae: Panesthiinae).Published as part of Qiu, Jian-Yue, Xu, Hao & Chen, Li, 2017, Taxonomic review of the Oriental flower beetle Coilodera penicillata species complex (Coleoptera: Scarabaeidae: Cetoniinae), pp. 511-537 in Zootaxa 4350 (3) on page 518, DOI: 10.11646/zootaxa.4350.3.5, http://zenodo.org/record/105932
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