1,721,938 research outputs found
Principles for a names-based cyberinfrastructure to serve all of biology*
No full textPatterson, David J., Faulwetter, Sarah, Shipunov, Alexey (2008): Principles for a names-based cyberinfrastructure to serve all of biology*. Zootaxa 1950 (1): 153-163, DOI: 10.11646/zootaxa.1950.1.12, URL: https://biotaxa.org/Zootaxa/article/view/zootaxa.1950.1.1
Rhynchomonas nasuta Klebs 1893
No full textRhynchomonas nasuta Klebs, 1893 (fi gures 1l, 2r) Description. Gliding cells with a bulbous motile snout. Cell 3.5-6 Mm long, 2.5-4 Mm wide, fl attened, fl exible. The snout, which contains a mouth, beats slowly. The anterior fl agellum lies alongside the snout and is hard to see, and the trailing fl agellum is about 2-2.7 times the cell length, and is acronematic. Cells consume attached bacteria. Commonly observed. Remarks. The length of R. nasuta has previously been reported to be from 3 to 11 Mm. This species has been found in marine sites in Antarctica, North Atlantic, subtropical and tropical Australia, Brazil, Canada, Denmark, Fiji, Gulf of Finland, Greenland, Hawaii, Norway and Equatorial Paci fi c (Griessmann, 1913; Throndsen, 1969, 1970; Burzell, 1973; Larsen and Patterson, 1990; Vørs, 1992a, 1992b, 1993a; Patterson et al., 1993; Vørs et al., 1995; Ekebom et al., 1996; Patterson and Simpson, 1996; Tong et al., 1997, 1998; Bernard et al., 1999). Rhynchomona s nasuta is common and widespread, but usually does not occur in large numbers. Our observations are in good agreement with those of Larsen and Patterson (1990). This species can be distinguished from small species of Amastigomonas by the bulbous snout.Published as part of Lee, Won Je & Patterson, David J., 2000, Heterotrophic flagellates (Protista) from marine sediments of Botany Bay, Australia, pp. 483-562 in Journal of Natural History 34 on page 49
Anisonema trepidum Larsen 1987
No full textAnisonema trepidum Larsen, 1987 (fi gures 3b, 4h, i) Description. Cell pro fi le oblong, 13-19 Mm long, 6.5-10 Mm wide, fl attened. With three distinct grooves on the dorsal and ventral faces. Two emergent fl agella are of unequal length. The anterior fl agellum is approximately 1.5 times the cell length, and the trailing posterior fl agellum is stronger than the anterior fl agellum, is approximately 3.5-5 times the cell length and tapers distally. The fl agellar pocket and nucleus are in the left side of the cell. Cells contained small granules. The cells glide quickly and jerk when changing direction. Rarely observed. Remarks. Cell length was previously reported to be 9-20 Mm and this species was found in marine sites in tropical Australia, Brazil, Danish Wadden Sea, Fiji and Hawaii (Larsen, 1987; Larsen and Patterson, 1990; Ekebom et al., 1996). Generally, our observations of the appearance of this species agree with those of Larsen and Patterson (1990), but we did not observe the arrests which Larsen and Patterson felt helped to distinguish this species. Anisonema trepidum is distinguished from A. acinus Dujardin, 1841 by its smaller size, cell shape and its behaviour. Anisonema glaciale Larsen and Patterson, 1990 has the same movement as A. trepidium, but can be distinguished by its larger size.Published as part of Lee, Won Je & Patterson, David J., 2000, Heterotrophic flagellates (Protista) from marine sediments of Botany Bay, Australia, pp. 483-562 in Journal of Natural History 34 on pages 495-49
Protaspis obliqua Larsen and Patterson 1990
No full textProtaspis obliqua Larsen and Patterson, 1990 (fi gures 22j, 23i, j) Description. Cell slightly oval or roundish, 12-32 Mm long, 10-27 Mm wide, dorsoventrally fl attened, with thickened cortex. With a ventral median groove; cell indented anteriorly and posteriorly where groove meets margin. Subapically, the right margin of the groove forms a protrusion. With two fl agella inserting under the protrusion; the anterior fl agellum is about 0.5 times the length of the cell and the posterior fl agellum is about 0.5 -1.5 times the length of the cell. The nucleus is without nuclear caps, is located subapically in a median position, is rounded and is 5-13 Mm in diameter. Contained many food particles up to 5 Mm long. Commonly observed. Descriptions based on observations of 16 cells. Remarks. This species was described from marine sites in tropical Australia, Fiji and England by Larsen and Patterson (1990) and Tong (1997b). Cell length was reported to be 8.5-20 Mm by previous authors. Generally, our observations are in accordance with those of Larsen and Patterson (1990) although our length range extends the previous range. Although the identities of most species within the genus are di ffi cult to establish, the protrusion near the fl agellar insertions makes this species easy to identify.Published as part of Lee, Won Je & Patterson, David J., 2000, Heterotrophic flagellates (Protista) from marine sediments of Botany Bay, Australia, pp. 483-562 in Journal of Natural History 34 on page 54
Ploeotia vitrea Dujardin 1841
No full textPloeotia vitrea Dujardin, 1841 (fi gures 17f, 19c -e) Description. Cell oval, about 16-22 Mm long and 10-14 Mm wide, not fl attened. This species has 10 longitudinal double raised ridges; four dorsally, two laterally, four ventrally. The anterior part of the cell is slightly obtuse and the posterior part of the cell is pointed. The anterior fl agellum is as long as the cell, and the posterior fl agellum is thick and twice as long as the cell. The ingestion organelle is well developed with a tiny protrusion at the top of the right-hand rod and tapers posteriorly. The nucleus is located in the right-hand side of the cell and the reservoir is in the left side. Rarely observed. Remarks. This species has been found in marine sites in subtropical and tropical Australia, Brazil, Fiji, Hawaii and USA, and the reported length range is from 16 to 25 Mm (Farmer and Triemer, 1988; Larsen and Patterson, 1990; Patterson and Simpson, 1996). Ultrastructural studies of Ploeotia vitrea were conducted by Farmer and Triemer (1988), and Larsen and Patterson (1990). Our observations are in agreement with Larsen and Patterson (1990). Ploeotia vitrea can be easily distinguished from other species in the genus by its 10 prominent ridges.Published as part of Lee, Won Je & Patterson, David J., 2000, Heterotrophic flagellates (Protista) from marine sediments of Botany Bay, Australia, pp. 483-562 in Journal of Natural History 34 on page 53
Petalomonas planus Lee and Patterson 2000, n. sp.
No full textPetalomonas planus Lee and Patterson, n. sp. (fi gures 14f, 16h -j. Type micrograph: fi gure 16i) Diagnosis. Petalomona s, rigid, 15-24 Mm long, dorso-ventrall y fl attened, hyaline body with one emergent fl agellum, without grooves or ridges. Description. Cell outline ovate, 15-24 Mm long, 5-10 Mm wide, rigid, dorsoventrally fl attened. Cells are rather hyaline. There are no grooves and no ridges on either side of the cell. Most cells have a pointed posterior end but some cells have a rounded posterior end. Small and large granules occupy the entire cell except at the poles. One fl agellum emerges from the canal and is slightly shorter than the cell. The reservoir is situated subapically in the midline of the cell. Cells move by gliding with the fl agellum in close contact with the substratum. Often common. Remarks. We assign this species to Petalomonas because it is a rigid gliding heterotrophic euglenid with one emergent fl agellum. This species is easily distinguished from most species of Petalomonas by its hyaline body and smooth cell surface. It is most similar to P. simplex Christen, 1962 in general appearance and hyaline body, but P. simplex is slightly larger (27.5-31 Mm) (see Christen, 1962b).Published as part of Lee, Won Je & Patterson, David J., 2000, Heterotrophic flagellates (Protista) from marine sediments of Botany Bay, Australia, pp. 483-562 in Journal of Natural History 34 on page 52
Ploeotia discoides Larsen and Patterson 1990
No full textPloeotia discoides Larsen and Patterson, 1990 (fi gures 17b, 18e -g) Description. Cell outline oval or elliptical, 11-13 Mm long, 7-8 Mm wide, dorsoventrally fl attened. Dorsally with two lateral grooves and one median groove, and ventrally with two lateral grooves which can be di ffi cult to see. The reservoir is located anteriorly in the left side of the cell and is roundish. The anterior fl agellum is about the length of the cell and the posterior fl agellum is about 1.5-2 times the length of the cell. The ingestion organelle reaches almost to the posterior end of the cell. Rarely observed. Observations based on six cells. Remarks. This species was fi rst described by Larsen and Patterson (1990) from Brazil and cell length was previously reported to be 10-12 Mm. Ploeotia discoides resembles P. tenuis in having three longitudinal dorsal grooves, but it is distinguished by its lack of ventral grooves, fl atness, roundish reservoir, and by its smaller size (Larsen and Patterson, 1990). The ventral grooves are very hard to see and may be absent in some cells. The differences between P. discoides and P. tenuis are not great and future work may demonstrate that there is no unambiguous discontinuity between the two taxa.Published as part of Lee, Won Je & Patterson, David J., 2000, Heterotrophic flagellates (Protista) from marine sediments of Botany Bay, Australia, pp. 483-562 in Journal of Natural History 34 on pages 527-52
Massisteria marina Larsen and Patterson 1990
No full textMassisteria marina Larsen and Patterson, 1990 (fi gures 21q, 22f) Description. Cells measuring 3-6.5 Mm, dorso-ventrally fl attened irregular body. Cells produce delicate pseudopodia with extrusomes, which extend radially from the cell and normally adhere to the substratum. Two short curved fl agella arise from the dorsal side of the cell and are relatively inactive. Rarely observed. Remarks. Generally, our observations are in good agreement with those of Larsen and Patterson (1990). Previously reported size ranges are 2.5-5 Mm (Patterson and Fenchel, 1990), 3-9 Mm (Larsen and Patterson, 1990; Vørs, 1992a, 1992b), 4.2-7 Mm (Ekebom et al., 1996), 2.5-4 Mm (Tong, 1997a) and 2-9.5 Mm (Tong et al., 1998). This species was found in marine sites in subtropica l and tropical Australia, Brazil, Denmark, Gulf of Finland, equatorial Paci fi c and Panama (Larsen and Patterson, 1990; Vørs, 1992a, 1992b; Vørs et al., 1995; Ekebom et al., 1996; Tong, 1997a; Tong et al., 1998).Published as part of Lee, Won Je & Patterson, David J., 2000, Heterotrophic flagellates (Protista) from marine sediments of Botany Bay, Australia, pp. 483-562 in Journal of Natural History 34 on page 54
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
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