1,720,960 research outputs found
Galkinius nom.nov., replacement name for Galkinia Ross & Newman, 1995
No full textPerreault, Ray T. (2014): Galkinius nom.nov., replacement name for Galkinia Ross & Newman, 1995. Zootaxa 3847 (3): 450-450, DOI: http://dx.doi.org/10.11646/zootaxa.3847.3.1
Acasta sulcata akanthosa, new replacement name for Acasta sulcata spinosa
No full textPerreault, Ray T. (2016): Acasta sulcata akanthosa, new replacement name for Acasta sulcata spinosa. Zootaxa 4169 (2): 374-374, DOI: http://doi.org/10.11646/zootaxa.4169.2.
On the authorship of Austromegabalanus psittacus (Molina)
No full textPerreault, Ray T. (2016): On the authorship of Austromegabalanus psittacus (Molina). Zootaxa 4169 (2): 375-375, DOI: http://doi.org/10.11646/zootaxa.4169.2.
PLATE 3 in Paleogene Verrucidae (Cirripedia: Verrucomorpha) of North America, with descriptions of three new species
No full textPLATE 3. Verruca sorrellae, sp. nov. a. Paratype NMV P332711, movable scutum (interior); b. paratype NMV P332711, movable scutum (exterior); c. paratype NMV P332712, movable scutum (exterior); d. paratype NMV P332712, movable scutum (interior); e. holotype LACMIP 14760, movable tergum (exterior); f. holotype LACMIP 14760, movable tergum (interior); g. paratype NMV P332712, movable tergum (exterior); h. paratype NMV P332715, rostrum (exterior); i. Paratype NMV P332715, rostrum (interior); j. paratype, carina (interior); k. paratype, carina (exterior); l. paratype NMV P332713, fixed tergum (interior); m. paratype NMV P332713, fixed tergum (exterior); n. paratype NMV P332713, fixed scutum (exterior); o. paratype P332713, fixed scutum (interior); p. paratype, fixed scutum (interior); q. paratype, fixed scutum (exterior). All type specimens are from the Lincoln Creek Formation, Porter Creek location (JLG 609, LACMIP locality 16935), Gray's Harbor County, Washington, USA.Published as part of Perreault, Ray T. & Buckeridge, John S., 2019, Zootaxa 4712 (1) on pages 34-50, DOI: 10.11646/zootaxa.4712.1.2, http://zenodo.org/record/358681
Verruca rocana Steinmann in Wilkins 1921
No full textVerruca rocana Steinmann, 1921 Verruca rocana Steinmann in Wilkins, 1921: 4, pl. 2, fig. 1, pl. 3, fig. 7.– Withers, 1935: 347, pl. 45, fig. 16–17.– Zullo & Baum, 1979: 238, pl. 2, fig. 1–5.– Weisbord, 1980: 183. Diagnosis. A Verruca with the shell depressed, closely ribbed longitudinally, the ribs standing out at the periphery, and as many as five, flat, wide, articulating ribs on rostrum. Movable scutum with lower articular rib varying in width, often very narrow, but apparently wider than the upper articular ridge. Movable tergum with apico-basal ridge narrower than the second articular ridge; first articular ridge very narrow (Withers, 1935: 347). Stratigraphic range. Palaeocene (Danian-Thanetian). Distribution. Patagonia, Argentina (Danian); Beaufort Formation, (Thanetian), Mosely Creek at Lenoir County line, near Kinston, North Carolina, USA. Holotype. A group of shells on Ostrea, in the Geological Institute of Freiburg, catalog number unavailable (Withers, 1935). The collections are now with the University of Freiburg, Freiburg im Breisgau, Germany. However, a recent inquiry indicates that the types may be lost. Type locality. Roca Formation, (Danian), Río Negro, Argentina. (Weisbord, 1980). Discussion. All presently known specimens of this species have the movable scutum and tergum cemented tightly in place. It is, therefore, impossible to examine internal details necessary for specific determination and comparison. The large temporal and geographic separation of the North Carolina specimens from the Patagonian type lot caused some concern to Zullo & Baum (1979), but morphological comparison of the two lots revealed no noticeable differences. Internal details of both lots shall be necessary to identify them precisely. This question shall be dealt with in a later paper. More recently, Brezina et al. (2017) restudied the area stratigraphy, identified the K-T boundary and reported occurrence of acrothoracican and Verruca remains. They verified the occurrence of Verruca rocana only in Danian deposits. They also reported V. rocana as having a partial calcareous basis, which was frequently left behind as the barnacles detached. The Late Cretaceous and Danian species Verruca prisca (Bosquet, 1854), from Europe, has a shell lacking longitudinal ribs. Gale (2014) reassigned this species to his new genus Priscoverruca. Verruca pusilla Bosquet, 1857 (late Maastrichtian, the Netherlands and Belgium) is similar, but has narrower, more rounded and numerous (up to 7) articular ribs between the carina and the rostrum, and by having broad, flat-topped longitudinal ribs (Zullo & Baum, 1979). No other Cretaceous or Paleocene species are known from North America. Type Repository. Hypotypes USNM 252260-252262.Published as part of Perreault, Ray T. & Buckeridge, John S., 2019, Paleogene Verrucidae (Cirripedia: Verrucomorpha) of North America, with descriptions of three new species, pp. 34-50 in Zootaxa 4712 (1) on pages 34-50, DOI: 10.11646/zootaxa.4712.1.2, http://zenodo.org/record/358681
Verruca Schumacher 1817
No full textGenus Verruca Schumacher, 1817 Verruca Schumacher, 1817: 35.– Darwin, 1854: 496.– Zevina, 1987b: 1812.– Newman & Hessler, 1989: 268.– Buckeridge, 1994: 90.– 1997: 128. Verruca “Section B” Pilsbry, 1916: 23. Verruca (Verruca).– Newman, Zullo & Withers, 1969: R281.– Foster, 1978: 68. Euverruca Broch, 1924: 63. Type. Lepas stroemia Müller, 1776: 251, OD. Diagnosis. Verrucids with shell form depressed; apices of rostrum and carina marginal; operculum parallel to base (Buckeridge, 1997: 128). Discussion. Verruca, as presently defined (Buckeridge, 1997), is a convenience group comprising those verrucids with the operculum nearly parallel to the base, and marginal apices on the rostrum and the carina. Former subgenera of Verruca sensu lato were elevated to full generic rank by Zevina (1987a, b). This classification has been accepted by later workers. Young (1998) named three more genera based on shell characters. Species of this genus, as presently restricted, fall into several lineages, which eventually may be separated into other genera (Buckeridge, 1997). The lineage that includes depressed shells, such as Verruca stroemia (typical Verruca), extends from the Late Cretaceous (late Maastrichtian; Gale, 2014) through the Recent, and comprises predominantly littoral species. The earliest records of this lineage occur in the Cretaceous of Western Australia with V. tasmanica tasmanica Buckeridge, 1983 and now includes the taxa described in this paper. All of the species in this lineage have a fixed scutum with a well-formed adductor plate. In some species, such as Verruca stroemia, Verruca jago Buckeridge, 1997 and Verruca reunioni Foster & Buckeridge, 1995, this plate extends to produce a rounded myophore. However, although all of the new species described herein possess a clear adductor plate, none have a definitive myophore. Buckeridge (1997: 130) noted that fine, regularly spaced punctae extending from the exterior through the wall plates and opercula to the interior surface also characterize some members of this lineage. In extant species, such as Verruca stroemia, Verruca laevigata G.B. Sowerby, 1827 and Verruca jago, these punctae contain chitin, and Buckeridge (1997) considered it likely that this would have mitigated shell loss. In shallow, aerated coastal waters, where localized conditions could approach a pH of less than 7, this would have been advantageous in helping to preserve shell integrity. Punctae have also been observed in some fossil verrucids, e.g. Verruca tasmanica, Verruca digitali Buckeridge in Buckeridge & Finger, 2001 (Miocene, California) and Verruca viteus Buckeridge, in Buckeridge, Lee & Robinson, 2014 (Oligocene, New Zealand). Although they have not been recorded from Verruca alabamensis sp. nov. (this paper), V. rocana Steinmann, 1921 (Palaeocene, Argentina) and Verruca sauria Buckeridge, 2011 (Late Cretaceous, New Zealand), their apparent absence may be due to diagenetic processes in some cases. They are apparently absent in V. alabamensis sp. nov., and as the specimens are well preserved, punctae probably did not develop in this taxon. Nonetheless, the presence of punctae is a useful diagnostic feature for members of this lineage. Occurrence. Upper Cretaceous to Recent, cosmopolitan. Most known fossil species are shallow water. Living species may be found from the intertidal zone to 620 m depth.Published as part of Perreault, Ray T. & Buckeridge, John S., 2019, Paleogene Verrucidae (Cirripedia: Verrucomorpha) of North America, with descriptions of three new species, pp. 34-50 in Zootaxa 4712 (1) on pages 34-50, DOI: 10.11646/zootaxa.4712.1.2, http://zenodo.org/record/358681
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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