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First records of three Tripartiella species (Ciliophora, Oligohymenophora, Peritrichida) from freshwater fishes along Yangtze River in China
No full textTang, Fahui, Zhao, Yuanjun, Liu, Chunning (2013): First records of three Tripartiella species (Ciliophora, Oligohymenophora, Peritrichida) from freshwater fishes along Yangtze River in China. Zootaxa 3681 (2): 169-174, DOI: 10.11646/zootaxa.3681.2.
Trichodinids (Ciliophora: Peritrichida) parasitic on gills of freshwater fishes, Carassius auratus and Aristichthys nobilis from China, with the description of Trichodina subtilihamata sp. nov.
No full textTang, Fahui, Zhao, Yuanjun, Tao, Yanfei (2007): Trichodinids (Ciliophora: Peritrichida) parasitic on gills of freshwater fishes, Carassius auratus and Aristichthys nobilis from China, with the description of Trichodina subtilihamata sp. nov. Zootaxa 1582 (1): 39-48, DOI: 10.11646/zootaxa.1582.1.4, URL: https://biotaxa.org/Zootaxa/article/view/zootaxa.1582.1.
FIGURE 4 in Morphological redescription and molecular characterization of Trichodina matsu Basson & Van As, 1994 (Ciliophora, Mobilida, Trichodinidae) infecting Tachysurus fulvidraco (Richardson, 1846) from Chongqing, China
No full textFIGURE 4. Phylogenetic tree based on ITS-5.8S rRNA region sequences by maximum likelihood (ML). Numbers given at nodes of branches show the boostrap support. Branch with double slash is shortened to 1/4 of original lengths. Scale bar represents 10 substitutions per 100 nucleotides.Published as part of Zhou, Qian, Tang, Fahui & Zhao, Yuanjun, 2021, Morphological redescription and molecular characterization of Trichodina matsu Basson & Van As, 1994 (Ciliophora, Mobilida, Trichodinidae) infecting Tachysurus fulvidraco (Richardson, 1846) from Chongqing, China, pp. 334-344 in Zootaxa 4995 (2) on page 341, DOI: 10.11646/zootaxa.4995.2.6, http://zenodo.org/record/505667
FIGURE 2 in Morphological redescription and molecular characterization of Trichodina matsu Basson & Van As, 1994 (Ciliophora, Mobilida, Trichodinidae) infecting Tachysurus fulvidraco (Richardson, 1846) from Chongqing, China
No full textFIGURE 2. Denticle diagrammatic drawing of Trichodina matsu Basson & Van As, 1994. (A) Trichodina matsu (redrawn from Basson & Van As 1994); (B) Trichodina matsu (population 1, present study); (C) Trichodina matsu (population 2, present study); (D) Trichodina hyperparasitis (redrawn from Wang et al. 2017); (E) Trichodina hyperparasitis (redrawn from Chen & Hsieh 1984).Published as part of Zhou, Qian, Tang, Fahui & Zhao, Yuanjun, 2021, Morphological redescription and molecular characterization of Trichodina matsu Basson & Van As, 1994 (Ciliophora, Mobilida, Trichodinidae) infecting Tachysurus fulvidraco (Richardson, 1846) from Chongqing, China, pp. 334-344 in Zootaxa 4995 (2) on page 337, DOI: 10.11646/zootaxa.4995.2.6, http://zenodo.org/record/505667
FIGURES 1–6 in First records of three Tripartiella species (Ciliophora, Oligohymenophora, Peritrichida) from freshwater fishes along Yangtze River in China
No full textFIGURES 1–6. Photomicrographs of silver impregnated adhesive disc of Tripartiella species. 1-2. Tripartiella obtusa Ergens & Lom, 1970; 3-4. Tripartiella orthodens Basson & Van As, 1987; 5-6. Tripartiella macrosoma Basson & Van As, 1987. (Scale bars = 20µm).Published as part of Tang, Fahui, Zhao, Yuanjun & Liu, Chunning, 2013, First records of three Tripartiella species (Ciliophora, Oligohymenophora, Peritrichida) from freshwater fishes along Yangtze River in China, pp. 169-174 in Zootaxa 3681 (2) on page 171, DOI: 10.11646/zootaxa.3681.2.6, http://zenodo.org/record/21818
Tripartiella macrosoma Basson & Van As 1987
No full textTripartiella macrosoma Basson & Van As, 1987 Host: Rhinogobio typus Locality: Qu County, Sichuan Site: Gills Date of sampling: April, 2012 Description (Figs. 5, 6, 9). The following morphological description was based on 20 specimens measured (n = 20). Small freshwate r Tripartiella with a compressed body, diameter 19.0–26.0 (23.1 ± 1.6); adhesive disc 14.0– 23.0 (18.0 ± 2.3); width of border membrane 1.5 –3.0 (1.9 ± 0.4); diameter of denticle ring 8.0–10.0 (9.3 ± 1.1); number of denticles 23–27; number of radial pins per denticle usually 4–5; span of denticle 5.5 –7.0 (6.4 ± 0.5); length of denticle 2.0– 2.5 (2.1 ± 0.1); blade long-strip or long-spoon shaped, length 4.0– 5.5 (4.6 ± 0.4), and pointed backward; distal blade surface rounded, not in parallel with border membrane, and much higher than the tangent point; anterior and posterior surfaces rough, not parallel with each other; anterior surface blade apophysis indistinct, just touching the Y + 1 axis; blade apophysis dominant and extending past Y + 1 axis. Central part relatively thin with point fitting tightly into preceding denticle. Shapes of the central part above and below the Xaxis not symmetrical and 0.5–1.5 (0.9 ± 0.2) in width. Ray connection barely distinguishable from the ray. Ray slim, and short, 1 –2.0 (1.7 ± 0.2) in length, ray apophysis invisible; ratio between denticle above and below X axis much more than two. Macronucleus C-shaped, external diameter 17.5–23.5 (19.8 ± 1.5) and internal diameter 12.5 –19.0 (15.8 ± 1.6). Micronucleus oval, 1.0–2.0 (1.4 ± 0.4) in length and 0.5–1.5 (0.8 ± 0.2) in width, situated in Y position. Adoral ciliary spiral turns about 190 °– 230 ° around peristomial disc. Remarks. Tripartiella macrosoma was originally described from gills of Barbus eutaenia in Klein Letaba River of the Olifants River system, South Africa (Basson & Van As, 1987). Later, it was first reported from gills of freshwater fishes, Hypophthalmichthys molitrix, Ctenopharyngodon idella and Pelteobagrus vachellii in Chongqing and Ningbo area of China (Tao & Zhao, 2006; Yu et al., 2011). The present population was isolated from gills of another freshwater fish, Rhinogobio typus, in Sichuan area of China. The morphology of adhesive disc of the present population is in agreement with the original description and morphometric data are also well within the range of the original description. Rhinogobio typus is established as the new host record for Tripartiella macrosoma in the present research work.Published as part of Tang, Fahui, Zhao, Yuanjun & Liu, Chunning, 2013, First records of three Tripartiella species (Ciliophora, Oligohymenophora, Peritrichida) from freshwater fishes along Yangtze River in China, pp. 169-174 in Zootaxa 3681 (2) on pages 172-173, DOI: 10.11646/zootaxa.3681.2.6, http://zenodo.org/record/21818
Trichodina nigra Lom 1960
No full textTrichodina nigra Lom, 1960 (Figs. 1D, 3D) Host: Carassius auratus. Location: Gills. Prevalence: Out of 16 fishes examined, one was infected (6.3 %). Locality: Chongqing, China (29º5' N, 106º5' E). Date of sampling: February, 2004. Description. Large-size, body diameter 65.0–73.0µm (69.6 ± 4.2); diameter of adhesive disc 49.0– 65.0µm (56.3 ± 3.4); border membrane 5.0–6.0µm (5.3 ± 0.3) in width; number of radial pins per denticle 10– 12 (n = 14); denticulated ring 28.0–34.0µm (31.6 ± 2.8) in diameter; number of denticles 28–32 (n = 14); span of denticle 18.0–20.0µm (19.2 ± 0.9); denticle 8.0–10.0µm (9.1 ± 0.8) in length; blade broad and sickleshaped, filling most of space between Y-axes; distal blade surface curved and smooth, always lower than tangent point; anterior surface curved and smooth, touching or almost extending to Y+1 axis; posterior margin forming shallow curve with deepest point at same level as apex; length of blade 7.0–8.0µm (7.3 ± 0.6), filling most of space between Y-axes; blade apophysis prominent whereas posterior projection invisible; central part well developed, 2.0– 3.0µm (2.3 ± 0.6) in width, extending more than halfway past Y axes; ray apophysis prominent; connection between central part and ray robust; length of ray 8.0–10.0µm (8.9 ± 1.2), ray long and slender and always parallel to Y axis; point of ray blunt and rounded; ratio of denticle above to below X axis always less than one. Macronucleus C-shaped, external diameter about 56; internal diameter about 44 and distance between terminations of macronucleus 14 approximately. Micronucleus oval, situated in +Y position. Adoral ciliary spiral turns about 380º –400º. Remarks. Trichodina nigra Lom, 1960 is a parasite, the taxonomic status of which is dubious (Van As & Basson, 1989). In the original description, this species comprises populations living on the skin, rarely on the gills of Cyprinus carpio, Scardinius erythrophtalmus, Rutilus rutilus, Abramis brama, Perca fluviatilis, Tinca tinca, Alburnus alburnus, Leuciscus cephalus and on the skin of different tadpoles in former Czechoslovakia. In the hosts mentioned above, all individuals of T. nigra agree in their principal characters, with an entire dark impregnated adhesive disc and without any clear area, so that there is no substantial diversity among them (Lom, 1961). Later there are many other confusing descriptions of so-called T. nigra from different parts of the world since this species was first found (Lom, 1961; Lom, 1970a; Stein, 1984). After that, those believed to be T. nigra, especially many subspecies of T. nigra, have been attributed to different species (Lom, 1970a). The dimensions and morphology of our specimens agree closely with those given by Lom (1961), generally falling within the range given in the description except for more radial pins per denticle in our population (10 – 12 vs. 8 – 10). T. nigra was ever found in South Bohemia, river Tisza, Hungary, Rybinsk Reservoir, USSR and South Africa (Lom, 1961; Lom, 1970a; Arthur & Lom, 1984; Basson, et al., 1983). This is the first report for T. nigra in China and extends its geographic distribution in Asia.Published as part of Tang, Fahui, Zhao, Yuanjun & Tao, Yanfei, 2007, Trichodinids (Ciliophora: Peritrichida) parasitic on gills of freshwater fishes, Carassius auratus and Aristichthys nobilis from China, with the description of Trichodina subtilihamata sp. nov., pp. 39-48 in Zootaxa 1582 (1) on page 43, DOI: 10.11646/zootaxa.1582.1.4, http://zenodo.org/record/509760
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
Trichodina uniforma Van As & Basson 1989
No full textTrichodina uniforma Van As & Basson, 1989 (Figs. 1C, 3C) Host: Carassius auratus. Location: Gills. Prevalence: Out of nine fishes examined, one was infected (11%). Locality: Chongqing, China (29º5' N, 106º5' E). Date of sampling: February, 2003. Description. Large-size, disc-like in shape when viewed laterally, body diameter 61.5–69.0µm (63.9 ± 3). Diameter of adhesive disc 50.0– 56.5µm (52.3 ± 2.3). Border membrane 6.0–7.0µm (6.4 ± 0.4) in width. Diameter of denticulated ring 33.0–37.0µm (34.5 ± 1.5). Centre of disc clear and without any guanules. Number of denticles 28–30 (n = 11) and number of radial pins per denticle 9–11 (n = 11). Span of denticle 16.5– 20.0µm (17.9 ± 1.2). Length of denticle 6.5 - 8.5µm (7.4 ± 0.7). Blade broad, filling almost entire space between Y axes, length 6.5–7.0µm (6.7 ± 0.3); distal blade surface straight and smooth, surface parallel to border membrane; anterior and posterior surface nearly straight and parallel to each other, mostly anterior surface extending just beyond Y+1 axis; tangent point of blade slightly higher than distal surface of blade in most specimens, and rarely on same level as distal surface; posterior margin forming extended curve, with lowest point lower than apex. Blade apophysis and posterior projection not present. Central part relatively thin but with rounded point fitting tightly in the proceding denticle and extending more than half way to Y-1 axis. Width of central part 2.0– 3.5µm (2.7 ± 0.4). Ray well developed, of equal thickness and bending slightly inanterior direction. Point of ray sharp, touching or extending past Y+1 axis, length 7.5–9.5µm (8.5 ± 0.9). Ray apophysis present and small, but inconspicuous in some specimens. Ratio of denticle above to below X axis less than one. Macronucleus horseshoe-shaped, external diameter about 58; distance between terminations of macronucleus about 14; micronucleus oval, situated in +Y position. Adoral ciliary spiral turns about 390º around peristomial disc. Remarks. This species was found on the gills of Carassius auratus, accompanied by Trichodinella epizootica (Raabe, 1950) Sramek-Husek, 1953 and Trichodina reticulata Hirschmann & Partsch, 1955, but with a lower intensity of infestation than Trichodinella epizootica. The morphometric data and denticle shape of our population are consistent with the original description of T. uniforma (Van As & Basson, 1989). However, our population shows some difference from the original population, perhaps because of the geographical distributions. In our population, the central part is more delicate than the original. Furthermore, in the original description of T. uniforma, the ray apophysis is more conspicuous than ours. Regardless of differences in blade morphology, we consider these differences to be within the range of variability for T. uniforma. This species had not been reported since its first description from Carassius auratus at Falls Fish Farm (25º25'S, 30º35'E) in the Komati River system, Eastern Transvaal, South Africa by Van As & Basson in 1989, and thus this report is the first record of T. uniforma in Asia.Published as part of Tang, Fahui, Zhao, Yuanjun & Tao, Yanfei, 2007, Trichodinids (Ciliophora: Peritrichida) parasitic on gills of freshwater fishes, Carassius auratus and Aristichthys nobilis from China, with the description of Trichodina subtilihamata sp. nov., pp. 39-48 in Zootaxa 1582 (1) on page 42, DOI: 10.11646/zootaxa.1582.1.4, http://zenodo.org/record/509760
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