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FIGURE 10 in Two new brackish-water species of Testudinella (Rotifera: Testudinellidae) from Qi'ao Island in the Pearl River estuary, China, with a key to marine and brackish-water Testudinella
No full textFIGURE 10. Testudinella quadrilobata sp. nov., scanning electron microscope photographs of trophi. A. Complete set, frontal view. B. Complete set (fulcrum lost), caudal view. al: alula, as: arched rami scleropili, dc: dorsal chamber, f: fulcrum, m: manubrium, mc: median chamber, r: ramus, ra: ramus apophysis, rf: ramus fenestra, svc: sub-ventral chamber, u: uncus, vc: ventral chamber.Published as part of Wei, Nan, De, Willem H. & Xu, Runlin, 2011, Two new brackish-water species of Testudinella (Rotifera: Testudinellidae) from Qi'ao Island in the Pearl River estuary, China, with a key to marine and brackish-water Testudinella, pp. 41-56 in Zootaxa 3051 on page 50, DOI: 10.5281/zenodo.20778
Testudinella zhujiangensis Wei, De Smet & Xu 2010
No full textTestudinella zhujiangensis Wei, De Smet & Xu 2010 (Figs 6 C, 12–14) Redescription of trophi. Trophi malleoramate (Figs 12, 13). Frontal latero-ventral margins of rami with a large, quadratic and stout reinforced, caudally recurved alula (Figs 12–14: al). Median rami apophyses (Fig. 12 B: ra) weakly developed. Inner margins distal rami sections bearing 14–21 / 13–21 strongly webbed arched rami scleropili (Figs 12 B, 14 A: as). Frontal rami scleropili with fairly acute distal tip (Fig. 14 B: fs). Basal apophyses moderately developed (Fig. 13: ba). Fulcrum short with a distinct proximal opening frontally (Fig. 13: fo). Unci plates (Fig. 12 A: u) consist of 11–13 / 11–12 weakly curved and strongly webbed teeth. Each uncus has 3, occasionally 4, major teeth with moderately offset lanceolate heads. Minor teeth with lanceolate head bearing two minute lateral knobs at their base; the webbing almost extends up to the base of the heads. Crescent-shaped manubria are composed of a superimposed dorsal, median, ventral and small sub-ventral chamber (Fig. 12 B). Measurements. Trophi (N = 6): length × width 17.4–20.4 × 22.4–24.5 µm, ramus 10.7–12.1 µm, fulcrum 5.2– 6.1 µm, largest major tooth 10.0– 10.6 µm, manubrium 10.7–12.4 µm.Published as part of Wei, Nan, De, Willem H. & Xu, Runlin, 2011, Two new brackish-water species of Testudinella (Rotifera: Testudinellidae) from Qi'ao Island in the Pearl River estuary, China, with a key to marine and brackish-water Testudinella, pp. 41-56 in Zootaxa 3051 on page 51, DOI: 10.5281/zenodo.20778
Colurella Bory De St. Vincent 1823
No full textColurella sp. (Fig. 5) Only a few specimens of this large and apparently undescribed Colurella species occurred in July 2008 at the artificial pond site on Qi’ao Island (Tab. 1), only once during four years of sampling. As our observations on this species are based on a single occasion only, and only insufficient specimen material could be studied, a critical evaluation of the taxonomic relevance of the characters is difficult. We therefore refrain from formally describing and naming the species, but give a brief description below, to facilitate future re-discovery and description. Colurella sp. can easily be confused with the morphologically similar C. sanoamuangae and C. ovalis sp. nov. It can be distinguished from C. sanoamuangae by its more rounded lorica, with ratios of length/height 1.53 and length/width 1.97, compared to about 1.7 and 2.4 in C. sanoamuangae (based on figures in the original description and specimens from Hainan Island), and especially by its wide u-shaped sinus at the posterior end of the lorica (dorsal/ventral view), compared to a peculiar tongue-shaped caudal projection above the foot aperture in C. sanoamuangae. It differs from C. ovalis sp. nov. mostly by the symmetrical, dorsoposteriorly slightly concave lorica, with wide u-shaped sinus over the foot aperture (dorsal/ventral view), and spread toes. Our earlier record of C. sanoamuangae from artificial ponds on Qi’ao Island (Wei & Xu, 2010) thus refers to this species. Measurements. Body (N = 1 females): Lorica length 101.8 µm, lorica height 66.5 µm, lorica width 51.7 µm, anterior aperture width 51.3 µm, second foot pseudosegment 5.0 µm, third foot pseudosegment 8.3 µm, toe length 48.9 µm.Published as part of Wei, Nan, Jersabek, Christian D., Xu, Runlin & Yang, Yufeng, 2019, New species and records of Colurella (Rotifera: Lepadellidae) from South China, with a key to Chinese Colurella, pp. 475-490 in Zootaxa 4586 (3) on page 481, DOI: 10.11646/zootaxa.4586.3.5, http://zenodo.org/record/264723
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Colurella sanoamuangae Chittapun, Pholpunthin & Segers 1999
No full text<i>Colurella sanoamuangae</i> Chittapun, Pholpunthin & Segers, 1999 <p>(Fig. 10)</p> <p> This species was to date only recorded from the Oriental region, in Thale Noi Lake on Malay Peninsula of Thailand (Segers & Pholpunthin, 1997), in coastal peat swamps in the Phuket Province of Thailand (Chittapun <i>et al</i>., 1999; 2007; Segers & Chittapun 2001) and from Northeast India (Sharma & Sharma, 2005; 2014). We found it at three sites on Qi’ao Island (Tab. 1) in low number and at two sites in the Nandujiang River Estuary, Haikou, Hainan Province (sampled biannually, Tab. 1).</p> <p> <i>Colurella sanoamuangae</i> is characterized by the posterior end of the lorica forming a triangular projection (lateral view), that overlays the foot aperture as a tongue-shaped structure (ventral/dorsal view) (Chittapun <i>et al</i>., 1999). This seems to be a stable morphological feature, as far as can be judged from previous observations. Accordingly, a previous record under this name from Iran, with posteriorly rounded lorica (Reihan Reshteh & Rahimian, 2014), probably represents another as yet undescribed species (Jersabek & Leitner, 2013). According to our present knowledge, <i>C. sanoamuangae</i> is an endemic species widely distributed in the Oriental region.</p> <p>Measurements. Body (N = 5 females): lorica length 97.8–101.4 µm, lorica width 46.7–48.5 µm, lorica height 59.4–67.2 µm, anterior aperture width 45.8–48.2 µm, second foot pseudosegment 6.7–8.1 µm, third foot pseudosegment 7.9–10.1 µm, toe length 46.6–47.5 µm.</p>Published as part of <i>Wei, Nan, Jersabek, Christian D., Xu, Runlin & Yang, Yufeng, 2019, New species and records of Colurella (Rotifera: Lepadellidae) from South China, with a key to Chinese Colurella, pp. 475-490 in Zootaxa 4586 (3)</i> on pages 486-488, DOI: 10.11646/zootaxa.4586.3.5, <a href="http://zenodo.org/record/2647236">http://zenodo.org/record/2647236</a>
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Testudinella
No full textKey to marine and brackish-water species of Testudinella 1 Foot opening circular or semi-circular.................................................................... 2 - Foot opening a more or less wide, inverted U-shaped slit..................................................... 3 2 (1) Foot opening circular, situated near centre or slightly posterior to centre of lorica; lorica almost circular; antero-ventral margin with median sinus; antero-dorsal margin almost straight to weakly convex, or three more or less pronounced shallow lobes.................................................................................. T. patina (Hermann, 1783) - Foot opening semi-lunar, almost terminally; lorica elliptical; antero-dorsal margin convex, antero-ventral margin with broad Vshaped sinus.................................................................. T. elliptica (Ehrenberg, 1834) 3 (1) Antero-ventral margin with median sinus bordered by two more or less acute projections........................... 4 - Antero-ventral margin almost straight or with median sinus not bordered by acute projections........................ 5 4 (3) Antero-dorsal margin convex without median sinus; lorica in cross-section asymmetrical dorsally and ventrally, with arched dorsal margin and smaller ventral margin delimited by rounded lateral margins, not particularly compressed....................................................................................... T. crassa (Levander, 1894) sp. inq. - Antero-dorsal margin with median sinus; lorica in cross section symmetrical both dorsally and ventrally, with rounded lateral margins, distinctly compressed dorso-ventrally............................................ T. dentata Myers, 1934 5 (3) Lorica strongly elongate, ratio length/width> 2.2; antero-ventral margin almost straight, antero-dorsal margin tripartite, with median part and two lateral parts.................................................... T. elongata De Smet, 2009 - Lorica not strongly elongate, ratio length/width <1.8; antero-ventral margin with distinct median sinus, antero-dorsal margin convex, or with median sinus, or tripartite................................................................. 6 6 (5) Both antero-dorsal and antero-ventral margin with median sinus or indentation..................................... 7 - Only antero-ventral margin with median sinus or indentation................................................... 8 7 (6) Antero-dorsal and antero-ventral margin with broad median sinus; two acute antero-lateral projections............................................................................................... T. bicorniculata De Smet, 2009 - Antero-ventral margin with broad median sinus, antero-dorsal margin with small median indentation; antero-lateral projections absent............................................................................. T. quadrilobata sp. nov. 8 (6) Antero-dorsal margin convex........................................................ T. clypeata (Müller, 1786) - Antero-dorsal margin tripartite, with median flat or slightly convex part and two lateral parts, whether or not connected by shallow folds......................................................................................... 9 9 (8) Lorica more or less elliptical, weakly truncate anteriorly; in cross-section lateral edges converging to a sharp angle; major unci teeth with more or less strongly club-shaped head; minor unci teeth parallel, rake-like............ T. obscura Althaus, 1957 - Lorica vase-shaped, distinctly truncate anteriorly; in cross section lateral edges broadly rounded; major unci teeth lanceolate; minor teeth not parallel, not rake-like..................................................................... 10 10 (9) Lorica in cross-section almost symmetrical both dorsally and ventrally, more or less cruciform with broadly rounded lateral edges and rounded dorsal and ventral median part; rami with stout, quadratic alulae.................................................................................................... T. zhujiangensis Wei, De Smet & Xu, 2010 - Lorica in cross-section asymmetrical dorsally and ventrally, not cruciform, with arched dorsal margin, lateral edges broadly rounded delimiting a smaller, weakly convex median part ventrally; rami with weakly developed, more or less spiniform alulae................................................................................. T. pseudobscura sp. nov.Published as part of Wei, Nan, De, Willem H. & Xu, Runlin, 2011, Two new brackish-water species of Testudinella (Rotifera: Testudinellidae) from Qi'ao Island in the Pearl River estuary, China, with a key to marine and brackish-water Testudinella, pp. 41-56 in Zootaxa 3051 on pages 53-54, DOI: 10.5281/zenodo.20778
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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