1,720,970 research outputs found
A generic key to the known larval Elmidae (Insecta: Coleoptera) of French Guiana
No full textShepard, William D., Clavier, Simon, Cerdan, Axel, Toulouse, Université (2020): A generic key to the known larval Elmidae (Insecta: Coleoptera) of French Guiana. Papéis Avulsos de Zoologia 60 (15): 1-9, DOI: 10.11606/1807-0205/2020.60.special-issue.15, URL: http://dx.doi.org/10.11606/1807-0205/2020.60.special-issue.1
FIGURE 1. Scutobates guianaensis n in A new taxonomic placement for Scutobates Cook, 1966, with the description of a new species from French Guiana (Acari: Hydrachnidia: Hygrobatidae)
No full textFIGURE 1. Scutobates guianaensis n. sp., holotype female. A = Dorsal shield; B = Ventral shield; C = gnathosoma (incomplete, partly still fused to venter) + P1-2 (P2 not in lateral position); D = palp; E = I-leg-4-6; F = IV-leg-5-6. Scale bars: A-B = 200 µm; C-F = 50 µm.Published as part of Smit, Harry & Clavier, Simon, 2019, A new taxonomic placement for Scutobates Cook, 1966, with the description of a new species from French Guiana (Acari: Hydrachnidia: Hygrobatidae), pp. 587-589 in Zootaxa 4543 (4) on page 588, DOI: 10.11646/zootaxa.4543.4.7, http://zenodo.org/record/261806
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
The phylogenetic relationships of the two-winged South American Leptophlebiidae genera revisited with first description of the male imago of Bessierus Thomas & Orth (Insecta: Ephemeroptera)
No full textFour of the 43 genera of South American Leptophlebiidae are dipterous. A previous phylogenetic hypothesis supported that clade Askola+Hagenulopsis, and that Bessierus+Perissophlebiodes, are sister groups of the Farrodes complex. Adults of Bessierus and Perissophlebiodes were not known but posteriorly Perissophlebiodes male imago was described. Here, we describe the male imago of Bessierus for the first time. Both genera share, besides the absence of the hind wings, the asymmetrical fork of MA, symmetrical fork of MP, dissimilar tarsal claws, and forceps sockets fused. Along with the description of the imago, a new diagnosis for the genus Bessierus is presented, also updating the identification key with this new information. A new cladistics analysis is performed to test the stability of the proposed relationships of these four genera within Leptophlebiidae. We obtained a single cladistic hypothesis where the addition of Bessierus adult characters resulted in new synapomorphies for the (Bessierus, Perissophlebiodes) clade, and improved its clade statistical support. The fused forceps sockets resulted in a synapomorphy uniting Bessierus, Perissophlebiodes and Simothraulopsis. As a result of this new analysis, the hypothesis of independent losses of the hind wings in the two dipterous groups studied is supported. The Farrodes lineage is not supported as proposed in previous studies, being restricted only to (Farrodes (Simothraulopsis, Homothraulus)) while the identity of “Perissophlebiodes lineage” is supported. The sister group relationship of Rondophlebia is not clearly defined.Fil: Dominguez, Eduardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto de Biodiversidad Neotropical. Universidad Nacional de Tucumán. Facultad de Ciencias Naturales e Instituto Miguel Lillo. Instituto de Biodiversidad Neotropical. Instituto de Biodiversidad Neotropical; ArgentinaFil: Cuezzo, Maria Gabriela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto de Biodiversidad Neotropical. Universidad Nacional de Tucumán. Facultad de Ciencias Naturales e Instituto Miguel Lillo. Instituto de Biodiversidad Neotropical. Instituto de Biodiversidad Neotropical; ArgentinaFil: Clavier, Simon. Hydreco Guyane; Guayana Frances
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
Scutobates guianaensis Smit & Clavier 2019, n. sp.
No full textScutobates guianaensis n. sp. Material examined. Holotype female, Petit Saut Lake near dam, French Guiana, 5° 3’32,0” N 59° 3’3,0” W, no date known, but between 2007 and 2017, leg. Clavier (RMNH). Diagnosis. Idiosoma completely sclerotized except a small area surrounding the genital field, dorsal furrow absent. Gnathosoma fused with Cx-I. Sixth segment of all legs with a distal spatulate seta. Dorsal sclerotization without a reticulate pattern. P2 and P3 without denticles. Description. Female: Idiosoma colour yellowish brown, 826 long and 745 wide, slightly truncated posteriorly, dorsum in lateral view dome-shaped. Idiosoma completely sclerotized without dorsal furrow, only a small area surrounding the genital field unsclerotized. Dorsum with five pairs of glandularia and the postocularia, the most posterior pair enlarged. Anterior coxae slightly extending beyond anterior idiosoma margin (but in Fig. 1B, due to a somewhat tilted position, appearing distanced from anterior idiosoma margin). All suture lines of coxae obliterated. Cxgl–4 located near suture line between Cx-III and Cx-IV. Genital field with three pairs of glandularia on slightly curved genital plates, width of genital field 227, width of pregenital sclerite 70. Length of P1–P5: 34, 50, 44, 84, 24. P2 and P3 without denticles, but P2 with three stout setae, P4 slender. Length of I-leg-4-6: 124, 150, 112; I-leg-5 anteroventrally with two stout, pointed setae. Length of IV-leg-4–6: 162, 190, 146. Legs without swimming setae, all legs with an anteroventral spatulate seta on the sixth segment (but not well visible in the illustrated fourth leg). Leg claws without claw blade, one claw simple, the other claw with a dorsal clawlet, the latter claw not illustrated in the first leg. Excretory pore located at the posterior margin of the idiosoma in the sclerotized integument. Male: Unknown. Etymology. Named for the country where the new species was found. Remarks. The new species differs from the male Scutobates ovalis (Cook, 1966), the only known species of the genus, in the absence of a reticulate pattern of the dorsal sclerotization, the absence of denticles on P2 and P3 and the presence of a spatulate seta on the legs (absent in S. ovalis). With S. ovalis the new species shares the extensive sclerotization, comprising almost the complete idiosoma except for a narrow ring of articular membrane surrounding the genital field. Cook (1966) stated that if the gnathosoma of the female is fused with Cx-I, the assignment to a separate taxon (i.e. Scutobates) is correct. In the female of the new species such a fusion is indeed present. As stated in the introduction, a complete sclerotization of the dorsum and the absence of a dorsal furrow is very rare among the Hygrobatidae. In our opinion this warrants the status of a full genus in Scutobates.Published as part of Smit, Harry & Clavier, Simon, 2019, A new taxonomic placement for Scutobates Cook, 1966, with the description of a new species from French Guiana (Acari: Hydrachnidia: Hygrobatidae), pp. 587-589 in Zootaxa 4543 (4) on pages 587-589, DOI: 10.11646/zootaxa.4543.4.7, http://zenodo.org/record/261806
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
- …
