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A new species of Odontosyllis Claparède, 1863 (Annelida, Syllidae) with re-descriptions of O. liniata Hartmann-Schröder, 1962 and O. gymnocephala Hartmann-Schröder, 1965
No full textVerdes, Aida, Pleijel, Fredrik, Aguado, Teresa (2011): A new species of Odontosyllis Claparède, 1863 (Annelida, Syllidae) with re-descriptions of O. liniata Hartmann-Schröder, 1962 and O. gymnocephala Hartmann-Schröder, 1965. Zootaxa 3095: 27-38, DOI: 10.5281/zenodo.20124
FIGURE 5. SEM micrographs. Odontosyllis pentalineata n in A new species of Odontosyllis Claparède, 1863 (Annelida, Syllidae) with re-descriptions of O. liniata Hartmann-Schröder, 1962 and O. gymnocephala Hartmann-Schröder, 1965
No full textFIGURE 5. SEM micrographs. Odontosyllis pentalineata n. sp. Holotype BIO-SIC A2518. A: Midbody chaetigers, dorsal view; B: Dorsal ciliary band, midbody chaetiger; C: Midbody parapodia, ventral view; D: Ventral ciliary band, midbody parapodium; E: Midbody chaetal fascicle; F: Compound chaetae, midbody chaetiger.Published as part of Verdes, Aida, Pleijel, Fredrik & Aguado, Teresa, 2011, A new species of Odontosyllis Claparède, 1863 (Annelida, Syllidae) with re-descriptions of O. liniata Hartmann-Schröder, 1962 and O. gymnocephala Hartmann-Schröder, 1965, pp. 27-38 in Zootaxa 3095 on page 35, DOI: 10.5281/zenodo.20124
FIGURE 2 in A new species of Odontosyllis Claparède, 1863 (Annelida, Syllidae) with re-descriptions of O. liniata Hartmann-Schröder, 1962 and O. gymnocephala Hartmann-Schröder, 1965
No full textFIGURE 2. Odontosyllis liniata Hartmann-Schröder, 1962.Paratype ZMH P-19652. A: Anterior part, dorsal view; B: Midbody parapodium; C: Compound chaetae, midbody chaetiger (chaetae arranged dorso-ventrally from left to right); D: Dorsal simple chaeta, posterior chaetiger. E: Aciculae, midbody chaetiger. Scale A 0.134 mm; B 0.07 mm; C–E 14 µm.Published as part of Verdes, Aida, Pleijel, Fredrik & Aguado, Teresa, 2011, A new species of Odontosyllis Claparède, 1863 (Annelida, Syllidae) with re-descriptions of O. liniata Hartmann-Schröder, 1962 and O. gymnocephala Hartmann-Schröder, 1965, pp. 27-38 in Zootaxa 3095 on page 31, DOI: 10.5281/zenodo.20124
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
Odontosyllis gymnocephala Hartmann-Schroder 1965
No full textOdontosyllis gymnocephala Hartmann-Schröder, 1965 (Fig. 1 A–C) Odontosyllis gymnocephala Hartmann-Schröder, 1965: 115, figs. 43–45. Material examined. American Samoa: holotype (ZMH P- 14756). Tutuila, Matuu Bay; seagrass; 22 Oct 1959. Coll. G. Hartmann-Schröder. Description. Holotype complete specimen, about 3 mm long, 0.3 mm wide, with 44 chaetigers; arched dorsally and flattened ventrally; without colour pattern, yellowish in alcohol. Prostomium rounded; four eyes in open trapezoidal arrangement. Antennae smooth, originating near anterior prostomial margin, close to each other, median antenna inserted slightly posterior to lateral ones, distinctly longer than combined length of prostomium and palps; lateral antennae shorter than central one. Palps shorter than prostomium, ventrally folded. First segment reduced dorsally. Occipital flap distinct, small, covering posterior margin of prostomium. Dorsal tentacular cirri smooth, elongated, similar to median antenna, ventral tentacular cirri shorter than dorsal ones. Dorsal cirri smooth and tapered distally, those of first chaetiger long, distinctly longer than body width, those of second and third chaetiger similar in length to body width, from fourth chaetiger onwards, shorter than body width. Ventral cirri oval, shorter than parapodial lobes. Parapodial lobes conical, with two small, distal pre- and postchaetal parapodial lobes. Chaetal fascicle with about 10–13 compound chaetae. Compound chaetae heterogomph, shafts with distal spines, blades short, bidentate, distal tooth larger than proximal one (Fig. 1 A); blades of chaetae within fascicle slightly decreasing in length from dorsal to ventral blades; dorsal blades about 12 Μm length, ventral blades about 9.5 Μm long. Dorsal simple chaetae on posterior parapodia, slender, with thin spines on edge (Fig. 1 B). Ventral simple chaetae not observed. Aciculae distally knobbed, ending with short terminal process (Fig. 1 C). Pharynx short, through four segments, number of teeth unknown (the holotype could not be dissected and the original description does not describe the structure of the pharynx). Proventricle short, through about five segments, muscle cell rows not visible through body wall. Pygidium lost. Remarks. Specimen poorly preserved. Odontosyllis gymnocephala chaetae and aciculae are similar to those of O. australiensis, but this species has bidentate chaetae with both teeth of similar size, while O. gymnocephala has the distal tooth larger than the proximal one. Additionally, O. australiensis differs from O. gymnocephala in having a longer proventricle, through about eight segments. Odontosyllis gymnocephala chaetae and aciculae also resemble those of O. polycera (Schmarda, 1861), although in the latter species the blades are narrower and the distal tooth is larger. Furthermore, O. polycera has a long proventricle, through nine to ten segments, while O. gymnocephala has a short proventricle, through about five segments. Another species with similar chaetae is O. detecta. However, this species differs from O. gymnocephala in having distally rounded aciculae and lacking occipital flap.Published as part of Verdes, Aida, Pleijel, Fredrik & Aguado, Teresa, 2011, A new species of Odontosyllis Claparède, 1863 (Annelida, Syllidae) with re-descriptions of O. liniata Hartmann-Schröder, 1962 and O. gymnocephala Hartmann-Schröder, 1965, pp. 27-38 in Zootaxa 3095 on pages 29-30, DOI: 10.5281/zenodo.20124
Odontosyllis liniata Hartmann-Schroder 1962
No full textOdontosyllis liniata Hartmann-Schröder, 1962 (Fig. 2 A–E) Odontosyllis liniata Hartmann-Schröder, 1962: 125, plate IX, figs. 53–56. Material examined. Peru: 3 paratypes (ZMH P- 19652). El Camotal Island, La Punta, Callao; 3 m deep, among Macrocystis rhizoids and sandy sediments. Santa Island, Coishco Bay, north of Chimbote; 9 m deep, muddy sediments. 29 May 1956. Coll. G. Hartmann-Schröder. Description. Longest paratype (ZMH P- 19652) complete specimen, 3 mm long, 0.3 mm wide, with 14 chaetigers. Body cylindrical, long and slender. Colour pattern on anterior body region consisting of a transverse band and a dark area, on front edge and front and rear corners of each segment (fide Hartmann-Schröder, 1962). Prostomium oval, four eyes in trapezoidal arrangement, anterior pair slightly larger than posterior ones. Palps broad, fused at base, shorter than prostomium. Antennae lanceolate, longer than prostomium and palps together; median antenna inserted between anterior eyes, extending to fourth segment; lateral antennae inserted near anterior margin, shorter, less than half length of median antenna (Fig. 2 A). First segment shorter than subsequent segments, anterior margin prolonged, partially covering the prostomium. Occipital flap absent (Fig. 2 A). Dorsal tentacular cirri similar in length and shape to median antenna; ventral pair shorter, similar in length to lateral antennae. Dorsal cirri lanceolate, longer than parapodial lobes, similar in shape and length to lateral antennae; granular material inside all cirri (Figs. 2 A, B). Ventral cirri wide, triangular, reaching as far as parapodial lobes (Fig. 2 B). Chaetal fascicle with 15– 16 heterogomph compound chaetae; shafts provided with spines on distal margin. Compound chaetae with short, triangular, unidentate blades, or slightly bidentate with a thin and small proximal tooth; blade edge with short spines, dorso-ventrally graduated in length from dorsal 15 m to ventral 13 m (Fig. 2 C). Solitary dorsal simple chaeta in posterior parapodia, slender, unidentate, with minute serrations on margin (Fig. 2 D); ventral simple chaetae not observed. Two aciculae on each parapodium, distally blunt (Fig. 2 E). Pharynx through about four segments, surrounded by eight papillae, denticled arc with 12 small teeth (fide Hartmann-Schröder, 1962). Proventricle long and slender, through about six to seven segments, with about 50 muscle cell rows (fide Hartmann-Schröder, 1962). Pygidium conical, with two anal cirri, slender, filiform, similar in length to dorsal cirri (fide Hartmann-Schröder, 1962). Remarks. All specimens poorly preserved. The holotype was not found and the longest paratype was described. The length of pharynx and proventricle as well as the compound chaetae observed in O. liniata are very similar to those of O. ctenostoma Claparède, 1868, although O. liniata antennae and cirri are lanceolate, instead of digitiform. Additionally, the number of teeth of the trepan is different, O. liniata having 12 and O. ctenostoma 6–8. Odontosyllis liniata compound chaetae, aciculae and number of teeth of the denticled arc are also similar to those of O. setoensis, although the latter has also distally trilobed aciculae.Published as part of Verdes, Aida, Pleijel, Fredrik & Aguado, Teresa, 2011, A new species of Odontosyllis Claparède, 1863 (Annelida, Syllidae) with re-descriptions of O. liniata Hartmann-Schröder, 1962 and O. gymnocephala Hartmann-Schröder, 1965, pp. 27-38 in Zootaxa 3095 on pages 30-32, DOI: 10.5281/zenodo.20124
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
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