1,720,980 research outputs found
Contribution to the knowledge of the scale insects (Hemiptera Coccoidea) from the Aosta Valley (Italy)
No full textA new species of Dysmicoccus damaging lavender in French Provence (Hemiptera, Sternorrhyncha, Pseudococcidae)
No full textGermain, F., Matile-Ferrero, D., Kaydan, M. B., Malausa, T., Williams, D. J. (2015): A new species of Dysmicoccus damaging lavender in French Provence (Hemiptera, Sternorrhyncha, Pseudococcidae). Zootaxa 3980 (4): 575-583, DOI: 10.11646/zootaxa.3980.4.
The unusual cover of the armoured scale Cryptaspidiotus barbusano (Lindinger) (Hemiptera: Diaspididae: Aspidiotinae) with comments on the scale covers of other Diaspididae Annales de la Societé Entomologique de France 48 (3-4)
No full textCryptaspidiotus barbusano (Lindinger 1908) is an endemic species of the Canary Islands,
only known on Apollonias barbujana (Lauraceae), a plant growing in the “Laurisilva” or laurel forest,
in several Macaronesian islands. Recently C. barbusano was collected on Heberdenia excelsa
(Myrsinaceae), a new host plant and family, in the Jardín Botánico Canario Viera y Clavijo, Las Palmas,
Gran Canaria. The recent collection of C. barbusano gives us the opportunity to redescribe its unusual
adult female scale cover. The truncate cone-shaped scale cover and its peculiar refl exed exit tunnel
for crawlers, with microscopic details of this rare species, are described and illustrated. The shape
of the exit tunnel is discussed and the scale cover is compared with scale covers of several other
diaspidid species. Finally, this study shows that C. barbusano is not a pupillarial species as formerly
described
Pseudococcus africanus Collizza 1933
No full text<i>Pseudococcus africanus</i> Collizza <p> This species was described from MOZAMBIQUE, Namialo District, on <i>Urochloa</i> sp. and from Lugenda, Niassa District on <i>Panicum</i> sp., (both Poaceae) by Collizza (1933). According to Ben-Dov (1994), the depository of the type material is unknown. Collizza’s description and illustration were adequate for the time.</p> <p>There are three slides, each containing a single specimen, in The Natural History Museum, London, each labelled as follows in a neat but unknown handwriting:</p> <p> Mozambique River, Lugenda, north Niassa, Dr Corrado Colizza [<i>sic</i>].</p> <p> The printed slide labels are of the British Museum (Natural History). We believe that the specimens may have been sent by Collizza for an opinion and belong to the original material later described by him. The specimens agree with Collizza’s description and illustration: the species, however, belongs to the genus <i>Peliococcus</i> Borchsenius, to which it is here transferred as <i>Peliococcus africanus</i> (Collizza) <b>comb. n.</b></p>Published as part of <i>Williams, D. J. & Matile-Ferrero, D., 2020, Report on two African mealybug species (Hemiptera: Sternorrhyncha Coccomorpha), pp. 439-440 in Zootaxa 4750 (3)</i> on page 439, DOI: 10.11646/zootaxa.4750.3.11, <a href="http://zenodo.org/record/3707450">http://zenodo.org/record/3707450</a>
Pseudococcus bingervillensis Magnin 1955
No full textPseudococcus bingervillensis Magnin When Magnin described this species from IVORY COAST, Bingerville, on Alchornea cordifolia (Euphorbiaceae) (Magnin 1955), he compared it with Pseudococcus njalensis Laing (Laing, 1929), now Formicococcus njalensis (Laing), a species that has since become well known as a vector of the virus causing swollen shoot disease of cacao (Hall, 1945, Strickland, 1947). According to Ben-Dov (1994) the type material of P. bingervillensis is probably lost. Magnin showed long dorsal setae on the head including those associated with the cerarii. Laing (1929) described F. njalensis originally from Sierra Leone on coffee but it is now known to occur throughout West Africa on at least 77 plant species in 30 plant families (García-Morales et al. 2019). Species in the genus Formicococcus Takahashi usually possess 18 pairs of cerarii, four of which occur on the head. Many of the cerarii each possess more than two conical cerarian setae. In an extensive study of the number of cerarii and numbers of cerarian setae on both sides of the body, on specimens from different localities and host plants in West Africa, Hall (1945) found wide variation. On the head and thorax only, the numbers of cerarii varied from 3–7 on one side, with a total of 6–36 conical cerarian setae. Specimens with the lowest counts were from Ashanti, Ghana, on Sterculia setigera (Sterculiaceae). All the specimens that Hall examined are deposited in The Natural History Museum, London (BMNH). Also listed by Hall (1945) is the host plant Alchornea cordifolia from Ghana, the same plant species as that on which Magnin’s specimens were collected. Hall (1945) also discussed the wide variation in numbers of setae and their lengths in the Formicococcus specimens he studied. Sometimes the conical cerarian setae are replaced by long flagellate setae, and Ezzat & McConnell (1956) (using the combination Planococcoides njalensis) stated that sometimes the fine dorsal setae come close enough to the cerarii to be considered as auxiliary setae. In Magnin’s illustration, most of the marginal setae on the head are long and flagellate but there are four cerarii on one side with conical setae. The Muséum national d’Histoire naturelle, Paris contains many specimens of F. njalensis, including many from Ivory Coast. Among these specimens are the following examples: 1. Côte d’Ivoire, Sakassou, N’Gata, Bois Sacré, on Alchornea cordifolia, C. Richard, 24.xi.1977, MNHN 7275 (4 slides, 3 adult females, 1 nymph) with 5 pairs of cerarii on the head containing conical setae, and a total of conical setae on each side of the body of: 14, 16, 17, 18, 13, 12. 2. Côte d’Ivoire, Toumodi, Lamto, Yaoble Baca, on Alchornea cordifolia, C. Richard, 2.xi.1977, MNHN 7148 (3 slides, 4 adult females) with 5 pairs of cerarii on the head and thorax containing conical setae and a total of conical setae on each side of the body of: 14, 11, 11, 11, 11, 12, 10 and 10. Although the above localities are not close to Bingerville (a suburb of the capital, Abidjan), the data show that there is much variation in the numbers of head cerarii and their conical setae on specimens from the type host plant of Magnin’s species. Also, the characters used to separate P. bingervillensis from F. njalensis in Ivory Coast fall within the range of variation in specimens of F. njalensis from other parts of West Africa. Magnin also separated his new species from F. njalensis because some cerarian and long dorsal setae had bifid tips; however, sometimes these setae become split at the tips during preparation on microscope slides. Magnin also stated that the “pores circulaires” or simple pores on the dorsal margin of his species were fewer than in F. njalensis; but Hall (1945) had already mentioned that there was some variation in their numbers in the material he had examined. We conclude that the name Pseudococcus bingervillensis Magnin is a junior synonym of Formicococcus njalensis (Laing) syn. n. We thank Gillian Watson for kindly reading the manuscript and for important comments.Published as part of Williams, D. J. & Matile-Ferrero, D., 2020, Report on two African mealybug species (Hemiptera: Sternorrhyncha Coccomorpha), pp. 439-440 in Zootaxa 4750 (3) on pages 439-440, DOI: 10.11646/zootaxa.4750.3.11, http://zenodo.org/record/370745
THE BOUGAINVILLEA MEALYBUG, A RAPID INVADER FROM SOUTH AMERICA TO EUROPE (PHENACOCCUS PERUVIANUS GRANARA DE WILLINK, 2007)
No full textScale insects are frequent invaders. The Bougainvillea mealybug was recorded in Europe for the first time in 1999 in Spain (Almeria) and later in 2002 in Italy (Sicily). Initially, this unknown species was identified provisionally as Phenacoccus sp. Records of this species became frequent later when it was found in other localities in Spain including the Balearic Islands, Great Britain, France including Corsica, Monaco, and Portugal. The host plants of this mealybug were in most cases species of Bougainvillea. The mealybug was identified as Phenacoccus peruvianus Granara de Willink, 2007
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
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