1,721,021 research outputs found
Revision of Condyloderes (Kinorhyncha, Cyclorhagida) including description of Condyloderes shirleyi sp. nov
No full textThe description of a new representative of the species-poor genus Condyloderes Higgins, 1969 from the Northeast Pacific (Alaska) is reported. The analyzed specimens of Condyloderes shirleyi sp. nov. showed a significant variation of numerous morphological characters, along with female-specific traits known also from other congeneric species. These findings stimulated the re-investigation of the type material of the six species of Condyloderes described so far, i.e., C. kurilensis Adrianov & Maiorova, 2016, C. megastigma Sorensen, Rho & Kim, 2010b, C. multispinosus (McIntyre, 1962) Higgins, 1969, C. paradoxus Higgins, 1969, C. setoensis Adrianov, Murakami & Shirayama, 2002, and C. storchi Higgins, 2004 in Martorelli & Higgins, 2004. Our study allowed to reveal various morphological novelties and to emend the diagnosis of these species and of the genus Condyloderes. Furthermore, our analysis led to synonymize C. megastigma with C. setoensis. The results of our investigation about the significant variation in C. shirleyi sp. nov. raise a wider question on species identity within Kinorhyncha, underscoring the necessity, if possible, to describe new species from a higher number of specimens and to concentrate on the morphological variation of the going-to-be-described species
The genus Condyloderes (Kinorhyncha: Cyclorhagida) in the Mediterranean Sea, including the description of two new species with novel characters
No full textTwo new species of Kinorhyncha belonging to the genus Condyloderes (Cyclorhagida: Centroderidae) are
described herein. The specimens were collected in the Gulf of Castellammare (Tyrrhenian Sea, Sicily,
Southern Italy) and off Livorno (Ligurian Sea, Tuscany, Central Italy), respectively. The new taxa represent
the first species of Condyloderes described from the Mediterranean basin. Condyloderes agnetis sp. nov. is
distinguished from its congeners by bearing cuspidate spines on segment 3 e a character never reported
before for Cyclorhagida e in subdorsal position, paradorsally and sublaterally on segment 7, an extremely
short midterminal spine, and a combination of cuspidate spines in lateral accessory position on segments
2 and 9, ventrolaterally slightly displaced ventromedially on segment 5, and ventrolaterally on segment
8. Condyloderes clarae sp. nov. is characterized by a combination of cuspidate spines on segments 5, 8, and
9 only, cuspidate spines ventrolaterally on segment 8 and in a lateral accessory position on segment 9,
ventromedial appendages on segments 5, 6, and 7 in females. Both species exhibit the recently described
type-6 sensory spots. Furthermore, the female morphology and data on the distribution of Condyloderes
multispinosus (McIntyre, 1962) within the Mediterranean Sea are reported, along with the record of the
co-occurrence of different species of Condyloderes at the same site. We report a certain degree of
intraspecific variation of taxonomically diagnostic characters like the presence or absence of cuspidate
spines and sensory spots on some segments in C. agnetis sp. nov. and C. multispinosus. The presence of
regularly arranged cuticular hairs on most trunk segments and of an acicular spine in lateral accessory
position on segment 1, along with the absence of an area of micropapillae on segment 9 in females of
C. agnetis sp. nov. and C. clarae sp. nov., unique within the genus, suggest the existence of distinct
evolutionary lines within Condyloderes. The discovery of the two new species highlights the potential
species richness of a genus considered species-poor until recently. Our findings underscore the importance
of promoting further studies even in rather well investigated areas, such as the Mediterranean
basin. Beyond the taxonomic and biogeographical interest, the data reported herein provides additional
insights for ongoing taxonomic and phylogenetic investigations on the Centroderidae and allies, and on
the whole Cyclorhagida
Chinorinchi dalla Sicilia nord-occidentale
No full textIl phylum Kinorhyncha include più di 160 specie esclusivamente marine, rinvenute dall'intertidale fino alle profondità abissali. Per il nostro Paese sono note circa 50 specie, segnalate esclusivamente da autori stranieri. Il rinvenimento di numerosi Chinorinchi nel Golfo di Castellammare (Trapani), durante indagini volte a valutare l’effetto di allevamenti ittici sulla comunità meiobentonica, ci ha offerto l’opportunità di intraprendere uno studio tassonomico/sistematico di questi micrometazoi. I campioni, raccolti negli ultimi due anni, sono stati ottenuti sottocampionando il sedimento pelitico prelevato a 30-50 m di profondità con una benna Van Veen; la fauna è stata fissata in situ con formalina al 10% ed estratta in laboratorio mediante centrifugazione in gradiente di Ludox. I Chinorinchi sono stati montati in glicerina e studiati al microscopio ottico (DIC) oppure preparati per l’osservazione al SEM. In più della metà dei siti analizzati (17) i Chinorinchi sono risultati terzi per abbondanza numerica (max 369,3 ± 110,9 ind./10 cm2) preceduti solo da Nematodi e Copepodi. In tutto sono state identificate una decina di specie, appartenenti a sette generi e cinque famiglie. Di particolare rilevanza è la scoperta di alcune specie nuove per la scienza ed il primo rinvenimento in Mediterraneo del genere Condyloderes. Importante è inoltre il ritrovamento di alcuni esemplari del raro genere Semnoderes, poiché ciò consentirà una migliore valutazione delle caratteristiche morfologiche del taxon basate su indagini al SEM. In considerazione anche della limitata area investigata i risultati della nostra ricerca costituiscono certamente uno stimolo ad approfondire le conoscenze di questo taxon nel nostro Paese
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
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
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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