66,576 research outputs found
Anaphothrips dentatus Cui, Xi and Wang
No full textAnaphothrips dentatus Cui, Xi and Wang Anaphothrips dentatus Cui, Xi & Wang, 2017: 50. This species, known only from Heilongjiang Province, has previously been known only from Sanjiang Plain (47°35.08'N, 133°31.42'E) (Cui et al. 2017), but is here recorded from Nanwenghe national Nature Reserves (51°22.83'N, 124°34.24'E). Specimens examined. China, Heilongjiang Province, Sanjiang Plain, 18.vii.2013, holotype female aptera with 1 male, 1 female paratypes from grasses (Jun Wang); same locality and habitat as holotype, 2.vii.2014, 3 females from grasses (Jun Wang); Nanwenghe National nature reserve (51°22.83'N, 124°34.24'E), 21.vii.2017, 4 female apterae from grasses (Jun Wang).Published as part of Cui, Yanze & Wang, Jun, 2019, The genus Anaphothrips (Thysanoptera, Thripidae) in China, with three new species, pp. 246-258 in Zootaxa 4700 (2) on page 249, DOI: 10.11646/zootaxa.4700.2.4, http://zenodo.org/record/354844
Tubifex conicus He, Cui & Wang 2012
No full text23. Tubifex conicus He, Cui & Wang, 2012 Tubifex conicus He, Cui & Wang, 2012: 160 –162. Material. Lake Yamzhao Yumco: ST 36, 2 spms; ST 37, 17 spms; ST 39, 45 spms; ST 40, 12 spms; ST 41, 24 spms; ST 42, 6 spms; ST 43, 27 spms; ST 44, 2 spms; ST 47, 36 spms; ST 48, 29 spms; ST 49, 21 spms. Remarks. Known only from Lake Yamzhao Yumco.Published as part of Cui, Yongde, He, Xuebao, Peng, Yu & Wang, Hongzhu, 2015, Records of Naididae and Lumbriculidae (Clitellata) from Tibet, China, with description of a new species of Nais, pp. 513-530 in Zootaxa 3956 (4) on page 527, DOI: 10.11646/zootaxa.3956.4.4, http://zenodo.org/record/24076
Anaphothrips oroqeni Cui & Wang 2019, sp. n.
No full textAnaphothrips oroqeni sp. n. (Figs 6, 16, 22, 28, 34, 39, 45, 49, 53) Female mac. Body and legs yellow; antennal segment I white, segments II and V–IX brown, segment III yellowish, segment IV mainly yellowish with apex pale brown (Fig. 28); fore wings pale and weakly shaded at base (Fig. 34). Head projecting slightly in front of eyes, with distinct transverse reticulations in basal part; eyes about half as long as head length, ventrally with 6 pigmented facets; three pairs of ocellar setae almost equal in length, ocellar setae III arising outside ocellar triangle (Fig. 6); antennae 9-segmented, segments III and IV with forked sense cone, II without microtrichia, VI weakly pedicellate, suture between VI–VII slightly oblique (Fig. 28). Pronotum with weak lines of sculpture, posteromarginal setae longer than other setae (Fig. 16); metanotum sculptured with polygonal reticulations, median setae fine and posterior to anterior margin, campaniform sensilla absent (Fig. 22). Fore wing first vein with about 3 setae basally, 2 setae medially, 2 setae distally and second vein with about 7 setae irregularly spaced, clavus with about 4 veinal setae and one seta at base (Fig. 34). Abdominal tergites smooth medially, lateral thirds with transverse sculpture; tergites II–VII with lobes on posterior margin, large laterally but small medially, campaniform sensilla close to posterior margin (Fig. 39); tergite VIII with posteromarginal comb complete, microtrichia with wide bases, spiracles about 0.4 times as long as length of lateral margin (Fig. 45). Measurements (holotype female in microns). Body length 1448. Antennae length 240; antennal segments I–IX length (width): 20(27), 32(28), 42(20), 40(18), 35(19), 33(20), 11(13), 9(8), 15(5). Head length 135, basal width 159; eyes length 73, width 44; diameter of ocelli 8–11; shortest distance between posterior ocelli 32. Pronotum median length 139, width 172. Fore wing length 676. Female mic. Similar to macropterous female, but forewing undeveloped only about 0.9 times as long as width of pterothorax. Measurements (micropterous female in microns). Body length 1492. Antennae length 250; antennal segments III–IX length: 44, 40, 41, 36, 11, 8, 15. Head length 143, basal width 166. Fore wing length 194. Male mic. Similar to micropterous female but smaller; tergite IX with two pairs of stout median thorn-like setae, setae I about 1.2 times as long as II (Fig. 53); sternites III–VII with small median oval pore plates (Fig. 49). Measurements (micropterous male in microns). Body length 1036. Antennae length 224; antennal segments I–IX length (width): 18(25), 28(25), 41(17), 32(18), 32(18), 33(16), 11(11), 9(6), 14(5). Head length 117, basal width 127; eyes length 54, width 34. Pronotum median length 105; width 155. Fore wing length 114. Abdominal tergite IX thorn-like setae I & II: 19, 16; sternites III–VII pore plates width: 23, 25, 20, 18, 15. Male mac. Similar to micropterous male but smaller and forewing developed. Measurements (macropterous male in microns). Body length 990. Antennae length 207; antennal segments III–IX length (width): 32(15), 33(15), 32(16), 31(16), 11(13), 8(7), 10(5). Head length 112, basal width 133; eyes length 59, width 37. Pronotum median length 97; width 146. Fore wing length 558. Abdominal tergite IX thorn-like setae I & II: 12, 9; sternites III–VII pore plates width: 21, 21, 16, 16, 14. Specimens examined. Holotype female mac., China, Heilongjiang Province, Greater Khingan, Nanwenghe national Nature Reserves (51°22.83'N, 124°34.24'E), 21.vii.2017, from grasses (Jun Wang). Paratypes: 1 female mac., 6 female mic., 1 male mic same data as holotype; Sanjiang Plain (45°01.08'– 48°27.93'N, 130°13.17'– 135°05.43'E), 7.vii.2017, 9 female mac., 6 female mic., 1 male mac. from grasses (Jun Wang); Mohe, Tuqiang town (52°56.85'N, 122°46.73'E), 21.vii.2017, 1 female mac., 4 female mic., 1 male mac., 4 male mic. from grasses (Jun Wang), same locality and habitat 1 female mac., 1 female mic., 1 male mac., 1 male mic., 12.viii.2018 (Jun Wang). Distribution. China (Heilongjiang). Etymology. The Latin word oroqeni derived from a minority of Oroqen Ethnic Group, who live in the type locality. Remarks. This new species is closely similar to the Japanese species A. ponokikirmui in having 9-segmented antennae, metanotum without campaniform sensilla and abdominal tergite VIII with complete posteromarginal comb and the microtrichia having wide bases. However, this new species can be distinguished as follows: abdominal tergite X yellowish (Fig. 45) but brown in A. ponokikirmui, tergites II–VII with lobes on posterior margin, but larger laterally (Fig. 39), in contrast to separated serrations in A. ponokikirmui.Published as part of Cui, Yanze & Wang, Jun, 2019, The genus Anaphothrips (Thysanoptera, Thripidae) in China, with three new species, pp. 246-258 in Zootaxa 4700 (2) on pages 253-255, DOI: 10.11646/zootaxa.4700.2.4, http://zenodo.org/record/354844
Tubifex conicus He, Wang & Cui 2012
No full textTubifex conicus He, Wang & Cui, 2012 (Figs 7–8) Tubifex conicus He, Wang & Cui, 2012: 160 –162, Fig. 1. New material. IHB XZ20150602 a–e, 5 mature specimens, whole-mounted in Canada balsam, from Gyaring Co, preserved in IHB, CAS. Gyaring Co (30°58' 43″N, 88°28′04″E), a lake located in northern Tibet of China, ca. 4,648–4,659 m asl. Water depth 11–37 m, water temperature 6.3–8.9°C, pH 6.3–8.9, dissolved oxygen 7.3–7.7 mg / L, conductivity 323–329 µs/cm. Collected by Yongde Cui and Baoqiang Wang on 2 June 2015. Description. Length 6.1–11.6 mm, width at genital segments X–XI 0.28–0.42 mm. Segments 38–65. Prostomium obtuse. Clitellum inconspicuous. No coelomocytes. Dorsal chaetae (0) 1 hair and 1–4 bifids per bundle. Hairs serrate, posteriorly generally absent (Fig. 7A, B). Dorsal bifids pectinate, upper and lower tooth subequal, with 2–3 fine intermediate teeth (Fig. 7A). Ventral chaetae bifid, 3–4 per bundle anteriorly, 2 per bundle posteriorly, upper tooth slightly longer than lower, with (0) 1–2 fine intermediate teeth (Fig. 7C, D). Ventral chaetae in X present, unmodified. Ventral chaetae in XI absent. Male pores paired in line with ventral chaetae, middle to posterior of XI. Chloragogen cells from VI onwards. Male genitalia paired in X–XI. Sperm funnel cup-shaped, 20 µm long, 40 µm wide (Fig. 8A,B: sf). Vas deferens 400–560 µm long, 12–15 µm wide, nearly 3–4 times as long as atrium, ciliated throughout and entering atrium apically (Fig. 8A, B: vd). Atrium spindle-shaped, 120–160 µm long, maximally 32–40 µm wide (Fig. 8A, B: at). Ejaculatory duct present. Prostate gland solid, 80–84 µm long, 60–64 µm wide, attached to ental portion of atrium (Fig. 8A, B: pr). Penis inconspicuous, surrounded by cuticular, symmetrical and funnel-shaped penial sheath. Penial sheath 36–40 µm long, 48–56 µm wide at ental end (Fig. 8A, B, C: ps). Testes paired in X, immediately behind septum 9/10. Ovaries paired in XI, immediately behind septum 10/11. Spermathecae absent. Remarks. The main difference of our redescription from T. conicus as originally described (He et al. 2012) is the absence of spermathecae. However, after our reinvestigation of the type series (holotype and paratypes), we are sure that the testes of T. conicus were mistaken for spermathecae in the original description. Further slight differences between the descriptions concern thickness of atrial epithelium (thicker in the redescription) and penial sheaths (thicker in the original description). They may relate to the stage of maturity or to different modes of interpretation of observations. The size and shape of atria in the original observation and this research are about the same. Penial sheaths appear to have a thick cuticle laterally in the holotype, but when comparing type series and our material, we found no significant differences in penial sheath thickness. Distribution and habitat. Known from Yamdrok Yumco (Lake Yamzho Yumco), Gyaring Co, Chargut Co, Uruni Co, Chikui Co, Amdo Tsonak Co, Tibet, China. All these lakes are located at above 4,000 m asl in Tibet. Gyaring Co, the locality of present redescribed materials, is about 300 km from the holotype locality of T. conicus, Yamdrok Yumco. Freshwater and brackish water.Published as part of Cui, Yongde, 2017, Four species of Tubifex Lamarck (Annelida: Oligochaeta: Naididae) from Tibet, China, pp. 366-378 in Zootaxa 4320 (2) on pages 371-372, DOI: 10.11646/zootaxa.4320.2.10, http://zenodo.org/record/89195
Ilyodrilus mesoprostatus Cui & Wang, 2009, n. sp.
No full textIlyodrilus mesoprostatus n. sp. Holotype: IHB YAN 20030405 n, whole-mounted specimen. Type locality: Xingyun Lake (24 ° 18 '01΄ N, 102 ° 47 ' 58 ΄ E), eastern Yunnan Province, China; depth 5.0 m, bottom temperature 16.1 °C, dissolved oxygen at bottom 7.6 mg /L, total nitrogen in water 2.960 mg /L, total phosphorus in water 0.129 mg /L, fine silt; 7 Apr 2003, coll. Y. Cui. Etymology: “ meso ” and “ prostatus ” are Latin for “middle” and “prostate”, respectively. The specific name refers to the prostate glands attaching to the middle part of the atria. Description: Specimen incomplete, length> 4.4 mm, diameter at XI about 0.7 mm, segments> 22. Clitellum inconspicuous. Dorsal chaetae 2–5 hairs and 2–4 bifids per bundle, hairs slender and smooth, 250–350 µm long, 2.0 µm thick basally; bifids (Fig. 4 C) 100–125 µm long, 2.5 –3.0 µm thick, with upper prong longer and thicker than lower. Dorsal chaetae absent in XI. Ventral chaetae (Fig. 4 A–B) bifid, 2–4 per bundle, 100–120 µm long, 2.5 –3.0 µm thick, with upper prong longer and thinner than lower. Spermathecal chaetae unmodified in X. Penial chaetae absent in XI. Male pores paired in line with ventral chaetae in mid-XI. Spermathecal pores paired in line with ventral chaetae in mid-X. Pharyngeal glands in II–III. Chloragogen cells from VI onwards. No coelomocytes. Male genitalia (Fig. 4 D) paired. Vas deferens (Fig. 4 D, vd) short and broad, 240–360 µm long, 36–46 µm wide, entering atrium apically. Atrial ampulla (Fig. 4 D, aa) somewhat spindle-shaped, 280–320 µm long, 58–108 µm wide. Prostate gland (Fig. 4 D, pr) large, attached to middle portion of atrium by short stalk. Atrial duct (Fig. 4 D, ed) curved, about 54 µm long, 25–36 µm wide. Soft part of penis (Fig. 4 D, pe) cylindrical, about 32 µm long, 20 µm diameter, enclosed in copulatory sac; penis surrounded by thin cuticularized, truncated-cone shaped sheath (Fig. 4 D, ps; Fig. 4 E), 116 µm long, 40–80 µm wide, one side of the ectal opening (Fig. 4 E, eo) curved upwards. Copulatory sac (Fig. 4 D, cs) 64 µm long, 40–50 µm wide. Spermathecal ampullae (Fig. 4 D, sa) oval to round, 105–125 µm in diameter, with sperm masses (Fig. 4 D, sm) in lumina, ducts (Fig. 4 D, sd) 160–250 µm long, 35–58 µm wide. Distribution and habitat: Known only from type locality, Yunnan Province, China. Freshwater lake, 5.0 m depth, water temperature 16 ºC, fine silt. Remarks: The genus Ilyodrilus consists of the type species, I. perrieri Eisen, 1879, together with I. templetoni (Southern, 1909) and the dubious entities I. frantzi Brinkhurst, 1965 and I. fragilis Eisen, 1879. The principal characteristics and the distribution of congeners are shown in Table 3. Ilyodrilus mesoprostatus n. sp. is distinguishable from congeners mainly in the respect that attachments of prostate glands are situated at middle part of the atria, while those of previously described species are all situated near the ental part of the atria (Table 3). The penial sheaths of different species are dissimilar. Despite the undeveloped type specimens, I. perrieri from California has more or less tubular, cuticular penial sheaths (Holmquist 1985). I. fragilis has thin sheaths (Eisen 1879; Brinkhurst 1978). The cosmopolitan I. templetoni has long conical tapering distally sheath with irregular opening (Brinkhurst 1965; Hrabĕ 1966) and I. frantzi has thin, truncated cone-shaped cuticular sheath (Brinkhurst 1965). The new species has truncated-cone shaped sheath, with ectal opening curved upwards at one side (Table 3). The presence of spermatozeugmata is regarded a diagnostic character of the genus Ilyodrilus (Brinkhurst & Jamison 1971). Although spermatozeugmata are absent in the present new species, it was assigned to this genus according to the structure of male genitalia. Spermatozeugmata are in fact not always present in Ilyodrilus. For instance, they were not mentioned in previous descriptions of I. perrieri and I. fragilis (Eisen, 1879; Holmquist 1985; Brinkhurst, 1965; Brinkhurst & Jamison 1971). Some specimens of I. templetoni have been described without spermathecae at all (Brinkhurst & Jamison 1971, Wang 2002), while for I. frantzi, the presence of spermatozeugmata was confirmed (Holmquist 1985). In the new species, I. mesoprostatus, the sperm were massed. So, the genus Ilyodrilus Eisen, 1879, needs a revision in the future.Published as part of Cui, Yongde & Wang, Hongzhu, 2009, Three new species of Tubificinae, Oligochaeta, from two plateau lakes in Southwest China, pp. 45-54 in Zootaxa 2143 on pages 51-53, DOI: 10.5281/zenodo.18861
Varichaetadrilus vestibulatus Cui & Wang, 2009, n. sp.
No full textVarichaetadrilus vestibulatus n. sp. Holotype: IHB YAN 20030201 a, whole-mounted specimen. Type locality: Northeast of Jianshan (24 º 36 ΄0 3 ΄ N, 102 º 51 ΄ 14 ΄ E) in Fuxian Lake, eastern Yunnan Province, China; depth 97 m, bottom temperature 13.5 °C, dissolved oxygen at bottom 5.6 mg /L, total nitrogen in water 0.193 mg /L, total phosphorus in water 0.018 mg /L, fine clay; 14 Feb 2003, coll. Y. Cui. Paratypes: IHB YAN 20030205 a (Paratype-a) ─ 20030205 b (Paratype-b), whole-mounted, two mature specimens from east of Lichang (24 º 32 ΄0 4 ΄ N, 102 º 51 ΄ 43 ΄ E) in Fuxian Lake; depth 113 m, bottom temperature 13.5 °C, dissolved oxygen at bottom 5.2 mg /L, total nitrogen in water 0.195 mg /L, total phosphorus in water 0.024 mg /L, fine clay; 14 Feb 2003, coll. Y. Cui. Etymology: The specific name “ vestibulatus ” is Latin for “vestibule”, and refers to the pear-shaped vestibule in spermathecal duct. Description: Length 11.3 –30.0 mm (Holotype: 30.0 mm), width at XII about 0.6 mm, with 58–140 segments (Holotype: 140). Clitellum inconspicuous. Dorsal chaetae (Fig. 1 A) of II–VII (II–III in paratype-a) bifid only, 3–8 per bundle, 115–140 µm long, 2.5 –3.0 µm thick, with upper prong twice as long as and thicker than lower, nodulus distal. Dorsals of VIII–X (IV–IX in paratype-a) 3–5 hairs and 5–8 bifids per bundle; hairs slender and smooth, 250–300 µm long, 2.0 µm thick basally; bifids (Fig. 1 C) 110–135 µm long, 2.0– 2.5 µm thick, prongs almost parallel, upper one slightly longer than, or as long as lower. Dorsals (Fig. 1 D) of XI–XII (X–XI in paratype-a) bifid only, 5–6 per bundle, shorter and thicker than those in II–VII, with upper prong usually curved, and slightly longer than, lower. From XIII (XII in paratype-a) onwards, dorsals 2–5 hairs and 3–6 bifids per bundle, shorter and thinner than those of VIII–X, hairs 200–240 µm long, bifids (Fig. 1 A) 100–115 µm long, with prongs similar to those of VIII–X, simple-pointed chaetae (Fig. 1 B) sometimes present. Ventral chaetae (Fig. 1 E, F) bifid, 6–8 per bundle anteriorly, 100–140 µm long, 2.0–3.0 µm thick, with prongs similar to those of dorsals in II–VII; 3–5 per bundle posteriorly, 90–110 µm long, 1.8 –2.0 µm thick, with upper prong longer and thinner than lower. Ventral chaetae absent in IX. Spermathecal chaetae (Fig. 2 A, sc; Fig. 2 B) one per bundle in mid-X (mid-IX in paratype-a), entally embedded in glandular sacs, about 130 µm long, 4.0 µm thick, ental part curved and ectal part grooved. Penial chaetae (Fig. 1 G) 1–2 per bundle in postero-XI (postero-X in paratype-a), 75–82 µm long, 2.8 µm thick, with upper prong slightly longer and thinner than lower, without nodulus. Male pores paired in line with ventral chaetae, posterior to middle of XI (mid-X in paratype-a). Spermathecal pores paired in line with ventral chaetae in mid-X (mid-IX in paratype-a), immediately anterior to spermathecal chaeta. Pharyngeal glands in II–III. Chloragogen cells from VI (V in paratype-a) onwards. No coelomocytes. Male genitalia (Fig. 1 H) paired in X–XII (IX–XI in paratype-a). Vas deferens (Fig. 1 H, vd) up to 35 µm wide, shorter than atrium, although posterior part unclear; entering apical end of atrium. Atrium (Fig. 1 H, st) extending to XII (XI in paratype-a), about 1220 µm long, 40–85 µm wide, tubular and rather homogeneous throughout, with thin outer muscular layer. Prostate glands (Fig. 1 D, pr) small, attached to ental portion of atrium by short stalk. Soft part of penis (Fig. 1 D, pe) cylindrical, about 75 µm long, 65 µm in diameter, enclosed in copulatory sac; penis surrounded by thin cuticularized, somewhat thimble-shaped sheath (Fig. 1 H, ps; Fig. 1 I), 80 µm long, 68 µm wide, with 5 µm thick walls. Copulatory sac (Fig. 1 H, cs) 95 µm long, 80–100 µm wide, with outer muscular layer 10–20 µm thick. Spermathecae (Fig. 2 A) paired in X–XIII (IX–XI in paratype-a). Ampulla (Fig. 2 A, sa) up to 600 µm long, maximally 390 µm wide. Duct (Fig. 2 A, sd) totally about 950 µm long, tripartite, consisting of: (1) ectalmost part, about 475 µm long, 50–75 µm wide, (2) pear-shaped vestibule (Fig. 2 A, sv), about 250 µm long, maximally 120 µm wide, (3) entalmost part, 200 µm long, 63–112 µm wide. Spermatozeugmata (Fig. 2 A, sz) about 500–900 µm long, 5–10 of them in ampulla, 1–2 in vestibule. Distribution and habitat: Known only from Fuxian Lake, Yunnan Province, China. Freshwater lake, 97–113 m depth, water temperature lower than 14 ºC, fine clay. Remarks: Judging from the long vasa deferentia, long tubular atria each with a small prostate gland, penes with distinct cuticular sheaths, and the atria longer than vasa deferentia, the new species fits the definition of Varichaetadrilus Brinkhurst, 1981. Nine species were previously known in the genus, all distributed in the Holarctic region (Timm, 2006). Among the known members of Varichaetadrilus, there are two species with spermathecal vestibules: V. pacificus (Brinkhurst, 1981), originally known from Washington, USA (Brinkhurst, 1981), and V. fulleri Brinkhurst & Kathman, 1983 recorded only from Kentucky, USA (Brinkhurst & Kathman, 1983). However, V. vestibulatus n. sp. is easily separated from those two species by the modified spermathecal chaetae and the shape of penial sheaths (Table 2). In addition, the spermathecal duct of the new species has pear-shaped middle vestibule, but V. p a c i f i c u s has cervix-like ental vestibule, and V. f u l l e r i has ectal vestibule. This is the first species of Varichaetadrilus recorded from China, and it is the lowest-latitude distributed member hitherto known in the genus. TABLE 2. Comparison of Varichaetadrilus vestibulatus n. sp. and allied species.Published as part of Cui, Yongde & Wang, Hongzhu, 2009, Three new species of Tubificinae, Oligochaeta, from two plateau lakes in Southwest China, pp. 45-54 in Zootaxa 2143 on pages 47-49, DOI: 10.5281/zenodo.18861
Wang Meng and contemporary Chinese literature: the vicissitudes of a committed writer
Full text linkThis thesis examines the way Wang Meng has developed as a writer from the 1950s to the 1990s in the context of New China's political and literary background. It looks at the compromises he was forced to make between his political beliefs in the Communist Party and his chosen role as a professional writer. After his disastrous early foray into what was deemed to be unacceptable political criticism with The Young Newcomer in the Organisation Department in the 1950s, when the opportunity came to start publishing again in the late 1970s he was boldly innovative in style, helping to transform New Period literature, but conservative in content, sticking to politically acceptable topics. It was only with Hard Porridge in 1989 that he ventured again, and very successfully, into political comment. There is no outstanding leading writer in contemporary China, but Wang Meng is a leading contender for the title
Florigerminis Cui & Hou & Yin & Wang 2022, gen. nov.
No full textFlorigerminis gen. nov. Type species. Florigerminis jurassica gen. et sp. nov. Etymology. Flori- for flower in Latin, - germinis for bud in Latin. Generic diagnosis. Woody branch with nodes, leaf scars, physically connected fruit and flower bud. Leaves abscised, helically arranged, with decurrent petioles. Flower–fruit pairs helically clustered on the distal portion of the branch. Flower bud terminated on the branch, paired, with a straight pedicel, oval-shaped, with several tepals suggested by their sculpture. Multiple tepals smooth-margined, tightly enwrapping the centre. Fruit borne on a slender curving pedicel, oval-shaped, with four persistent decussately arranged foliar parts and an apical invagination. Endocarp elongated oval, with a pointed tip. Locality. Daohugou Village, Ningcheng, Inner Mongolia, China (41° 18′ 39.60″ N, 119° 13′ 29.14″ E). Horizon. The Jiulongshan Formation.Published as part of Cui, Da-Fang, Hou, Yemao, Yin, Pengfei & Wang, Xin, 2022, A Jurassic flower bud from China, pp. 1-13 in Geological Society, London, Special Publications 521 on pages 3-4, DOI: 10.1144/SP521-2021-122, http://zenodo.org/record/588388
Native p-type transparent conductive CuI via intrinsic defects
No full textThe ability of CuI to be doped p-type via the introduction of native defects has been investigated using first-principles pseudopotential calculations based on density functional theory. The Cu vacancy has a lower formation energy than any of the other native defects, which include I vacancy (V(I)), Cu interstitial (Cu(i)), I interstitial (I(i)), Cu antisite (Cu(I)), and I antisite (I(Cu)). Combined with its shallow acceptor level, it offers sufficient hole concentrations in CuI. The natural band alignments as compared to zinc-blende ZnS, ZnSe, and ZnTe have also been calculated in order to further identify the p-type dopability of CuI. It is found that CuI has a relatively high valence band maximum and conduction band minimum, which also makes it easy to dope CuI p-type in terms of the doping limit rule. In addition, the small effective mass of the light hole-about 0.303m(0)-can provide high mobility and p-type conductivity in CuI. All of these results make CuI an ideal candidate for native p-type materials (C) 2011 American Institute of Physics. [doi:10.1063/1.3633220
Tubifex conicus He & Cui & Wang 2012, n. sp.
No full textTubifex conicus n. sp. (Fig. 1, Table 1) Holotype. Mature, whole-mounted specimen, IHB XIZ20060409 a. Type locality. Lake Yamzho Yumco in Tibet, China; Silt, depth of sample 12–38 m (holotype from 28 m, 29°10.672'N, 90°36.466'E), surface water temperature 12ºC, pH 9.0, DO 7.2 g /L, salinity 1.2‰, surface water conductivity 2.369 mS/cm, 9 April 2006, coll. by X. B. He and Y. D. Cui. Paratypes. IHB XIZ20060409 b, IHB XIZ20100624 b-e, 5 whole-mounted specimens; 21 specimens in 10% formalin, 9 April 2006 and 24 June 2010, coll. by X.B. He and Y.D. Cui. Etymology. The specific name “ conicus ” is Latin for “conical”, and refers to the conical penial sheath. Description. Length 4.6–5.2 mm (Holotype: 5.2 mm), width at X about 0.5 mm; segments 27–32 (Holotype: 32). Clitellum inconspicuous. Prostomium conical. Dorsal chaetae 1(0) hair and 1–4 bifids per bundle. Hairs smooth, 105–240 µm long, sometimes absent in posterior segments; bifids (Fig. 1B) pectinate, 3–4 per bundle anteriorly, 62–88 µm long, upper tooth slightly longer than lower, with 2–3 thin intermediate teeth, nodulus distal, 1–3 per bundle in posterior segments, 65–80 µm long, teeth shorter and thicker than those of anterior dorsal bifids, teeth equally long, with 2–3 thin intermediate teeth. Ventral chaetae (Fig. 1A) bifid, 4–5 per bundle anteriorly, 65–102 µm long, 2.0–2.5 µm thick, with upper tooth longer than the lower; 2–3 per bundle posteriorly, 72–80 µm long, 2.0–2.3 µm thick. Spermathecal chaetae unmodified, 4 per bundle in posterior to mid-X. No penial chaetae. Male pores paired in line with ventral chaetae, anterior to mid-XI. Spermathecal pores paired in line with ventral chaetae, posterior to mid-X. Chloragogen cells from VI onwards. No coelomocytes. Male genitalia (Fig. 1D) paired in X–XI. Vas deferens (Fig. 1D, vd) ciliated throughout, 593–675 µm long, 15–25 µm wide, entering atrium apically. Atrium (Fig. 1D, at) spindle-shaped, histologically homogeneous, 140 µm long, up to 44 µm wide, thin-walled in holotype (6.8–8.3 µm thick in paratypes). Prostate gland (Fig. 1D, pr) large, attached to nearly middle portion of atrium by short stalk. Penial sheath (Fig. 1D, ps; Fig. 1E) symmetrically conical, 48 µm wide at the base, 10 µm in diameter ectally, 45 µm long, wall 3.3–5.2 µm thick. Spermatheca (Fig. 1D, sa) long, pear-shaped. Ampulla 118–125 µm long, 59–92 µm wide; duct (Fig. 1D, sd) short, 44–94 µm long, 22–24 µm wide, spermatozeugmata unknown. Distribution. Known only from Lake Yamzho Yumco, Tibet, China. Remarks. Judging from the apical junction between the long vas deferens and the atrium, the conical-shaped penis, the large prostate gland attaching to nearly middle portion of atrium, and the absence of an ejaculatory duct, the new species appears to be most closely related to the genera Christerius Holmquist, 1985, Tasserkidrilus Holmquist, 1985 and Tubifex Lamarck, 1816 (sensu stricto) (Brinkhurst 1962, 1984; Holmquist 1983, 1985; Timm 1989). The systematics of the genus Tubifex is complex. The Tubifex group (sensu lato) was classified by Holmquist (1985) into 12 genera, but this revision has met with different levels of acceptance (Holmquist 1985; Timm 1989; Juget et al. 2006). The new species has symmetrically conical penial sheaths, and it does not fit the main diagnostic characters of Christerius and Tasserkidrilus, due to the fact that Christerius has no penial sheaths and Tasserkidrilus has asymmetrically conical sheaths (Holmquist 1985; Timm 1989). The long and winding vas deferens, entering the histologically homogeneous and spindle-shaped atrium apically, large prostate gland attaching to atrium by a short stalk, no ejaculatory duct and symmetrically conical penial sheaths of the new species fit closely the definition of Tubifex, although its vasa deferentia are not bipartite. There are three species of Tubifex, viz T. newfei Pickavance & Cook, 1971, T. montanus Kowalewski, 1919, T. natalensis Brinkhurst, 1966, that have conical penial sheaths (Pickavance & Cook 1971; Brinkhurst & Jamieson 1971). With regard to the unmodified genital chaetae and the pectinate needles, T. conicus resembles T. newfei, but the latter has granular penis sheaths and apically curved atria (Pickavance & Cook 1971). Tubifex montanus is well distinguishable from the new species by its palmate chaetae and larger length/width ratio of the penial sheaths (Brinkhurst & Jamieson 1971). Moreover, T. natalensis differs from the new species by serrated hair chaetae and broad conical penis sheaths (Brinkhurst & Jamieson 1971). A comparison of Tubifex species with conical penial sheaths is given in Table 1.Published as part of He, Xuebao, Cui, Yongde & Wang, Hongzhu, 2012, Two new species of Tubificinae (Annelida: Clitellata: Naididae) from Tibet, China, pp. 159-165 in Zootaxa 3458 on pages 160-16
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