1,720,960 research outputs found
Gymnura
No full textGymnura van Hasselt, 1823 Type species: Raja micrura Bloch & Schneider, 1801, by monotypy.Published as part of Jacobsen, Ian P. & Bennett, Mike B., 2009, A Taxonomic Review of the Australian Butterfly Ray Gymnura australis (Ramsay & Ogilby, 1886) and Other Members of the family Gymnuridae (Order Rajiformes) from the Indo-West Pacific., pp. 1-28 in Zootaxa 2228 on page 9, DOI: 10.5281/zenodo.19024
FIGURE 2 in A Taxonomic Review of the Australian Butterfly Ray Gymnura australis (Ramsay & Ogilby, 1886) and Other Members of the family Gymnuridae (Order Rajiformes) from the Indo-West Pacific.
No full textFIGURE 2. Tail morphological variation in Gymnura australis var eastern Australia; (a) dorsal view; (b) lateral view, no dorsal fin; (c) lateral view, with dorsal fin; (d) tail base, no dorsal fin; (e) tail base, with dorsal fin; (a), (b) and (d) (QM I 38138) (c) and (e) (QM I 38169).Published as part of Jacobsen, Ian P. & Bennett, Mike B., 2009, A Taxonomic Review of the Australian Butterfly Ray Gymnura australis (Ramsay & Ogilby, 1886) and Other Members of the family Gymnuridae (Order Rajiformes) from the Indo-West Pacific., pp. 1-28 in Zootaxa 2228 on page 14, DOI: 10.5281/zenodo.19024
Atelomycterus Garman 1913
No full textGenus <i>Atelomycterus</i> Garman, 1913 <p> Type species: <i>Scyllium marmoratum</i> Bennett, 1830, by monotypy.</p> <p> Compagno and Stevens (1993) defined the genus <i>Atelomycterus</i> as part of the <i>A. fasciatus</i> description; therefore, it will not be reviewed as part of the current analysis. Compagno (1988) also provides a more comprehensive analysis of the genus and its diagnostic features.</p>Published as part of <i>Jacobsen, Ian P. & Bennett, Mike B., 2007, Description of a new species of catshark, Atelomycterus marnkalha n. sp. (Carcharhiniformes: Scyliorhinidae) from north-east Australia, pp. 19-36 in Zootaxa 1520</i> on page 24, DOI: <a href="http://zenodo.org/record/177424">10.5281/zenodo.177424</a>
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Variations on the Author
Full text link“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
Full text linkWe 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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe 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
Atelomycterus
No full textKey to the species of <i>Atelomycterus.</i> <p>1. Dorsal fins not angled rearwards, posterior margins sloping posteroventrally from fin apices, Dark brown blotches and large marking sparse, colour pattern dominated by brownish-grey saddles and bands on pale background.................................................................................................................................................. 2</p> <p>- Dorsal fins angled rearwards, posterior margins vertical or sloping anteroventrally from fin apices. Dark brown spots and markings dominating colour pattern................................................................................. 3</p> <p> 2. Dark brown spots and markings sparse, white spots absent or fewer in number than brown spots. Trunk denticles with prominent lateral ridges, anal caudle-fin space greater than ten percent of total length........ <i>............................................................................................ Atelomycterus fasciatus</i> (north-west Australia).</p> <p> - Dark brown spots forming irregular lines around saddle-mark margins and centre of inter-saddle spaces, white spots more numerous than brown, present on lateral surfaces post third-gill, on dorsal fins and caudal fin. Lateral trunk denticles without lateral ridges, anal caudle-fin space less than ten percent of total length <i>............................................................................... Atelomycterus marnkalha</i> (north-east Australia).</p> <p> 3. Saddle markings obsolete, numerous light grey and white spots on head, body and fins; strongly defined white stripe through gill slits. Claspers elongate and narrow, with glans extending less than half length of clasper outer margin <i>.......................................................... Atelomycterus marmoratus</i> (Indo-West Pacific).</p> <p>- Colour pattern of brownish grey saddles, very few or no pale spots on head, body or fins. Claspers shorter and less elongate, sometimes stout, with glans extending more than half length of clasper outer margin. 4</p> <p> 4. Dorsal fins strongly falcate. About 6 well-defined saddle marking between first dorsal-fin origin and posterior of eye. Claspers moderately elongate, their outer margin length less than 5 times width at base....... <i>................................................................................................ Atelomycterus macleayi</i> (northern Australia)</p> <p> - Dorsal fins weakly falcate. Four well-defined saddle markings between first dorsal-fin origin and posterior of eye. Claspers moderately elongate, their outer margin length more than 5 times width of base <i>..............................................................................................................</i> <i>Atelomycterus baliensis</i> (Indonesia)</p>Published as part of <i>Jacobsen, Ian P. & Bennett, Mike B., 2007, Description of a new species of catshark, Atelomycterus marnkalha n. sp. (Carcharhiniformes: Scyliorhinidae) from north-east Australia, pp. 19-36 in Zootaxa 1520</i> on page 35, DOI: <a href="http://zenodo.org/record/177424">10.5281/zenodo.177424</a>
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