1,720,983 research outputs found
FIGURE 6 in A new species of antipatharian coral (Cnidaria: Anthozoa: Antipatharia) from the southern California Bight
No full textFIGURE 6. Antipathes spp.: A, A. speciosa Brook, branchlets from schizoholotype (USNM 100358); B, A. minor Brook, branches from schizoholotype (USNM 1000383); C, A. dendrochristos n. sp., branches from holotype (USNM 1026793). Scale bars 1 cm.Published as part of Opresko, D. M., 2005, A new species of antipatharian coral (Cnidaria: Anthozoa: Antipatharia) from the southern California Bight, pp. 1-10 in Zootaxa 852 on page 9, DOI: 10.5281/zenodo.27321
Shallow-water black corals (Cnidaria: Anthozoa: Hexacorallia: Antipatharia) from SW Madagascar
No full textAntipatharians, also known as black corals, represent a small group of anthozoan hexacorallians found in all oceans of the world. They are generally considered a deep-water taxon; however, some of the most diverse communities are known from tropical shallow waters. With a few poorly detailed exceptions, shallow-water black corals from the Indian Ocean and especially those from Madagascar are mostly unknown. In this study, we report for the first time a highly diverse black coral assemblage of the Western Indian Ocean thriving in shallow waters and upper mesophotic depths (10–52 m depth) along the SW coast of Madagascar. A total of 22 species belonging to six genera (Antipathes, Arachnopathes, Cirrhipathes, Cupressopathes, Myriopathes and Stichopathes) and two families (Antipathidae and Myriopathidae) are described, of which 20 are found in the northern pass of the Great Reef of Toliara, thus representing the most diverse site of the areas investigated. Most of the shallow-water species from the Indian Ocean were originally described more than a century ago, sometimes without being reported again until now. All the descriptions herein rely solely on morphology and include detailed in situ pictures and scanning electron microscope images, in addition to range expansions for many species
A new species of Tanacetipathes from Brazil, with a redescription of the type species T. tanacetum (Pourtales) (Cnidaria, Anthozoa, Antipatharia)
No full textPérez, C. D., Costa, D. L., Opresko, D. M. (2005): A new species of Tanacetipathes from Brazil, with a redescription of the type species T. tanacetum (Pourtales) (Cnidaria, Anthozoa, Antipatharia). Zootaxa 890: 1-12, DOI: 10.5281/zenodo.17092
FIGURE 2 in Discovery of Aphanipathes verticillata (Cnidaria: Anthozoa: Antipatharia) in the Hawaiian Islands
No full textFIGURE 2. Aphanipathes verticillata verticillata Brook, schizoholotype (MCZ 68), spines on branchlets. Scale bars = 0.10 mm.Published as part of Opresko, D. M., Wagner, D., Montgomery, A. D. & Brugler, M. R., 2012, Discovery of Aphanipathes verticillata (Cnidaria: Anthozoa: Antipatharia) in the Hawaiian Islands, pp. 24-39 in Zootaxa 3348 (1) on page 28, DOI: 10.11646/zootaxa.3348.1.2, http://zenodo.org/record/525170
FIGURE 1. A in Discovery of Aphanipathes verticillata (Cnidaria: Anthozoa: Antipatharia) in the Hawaiian Islands
No full textFIGURE 1. A. Aphanipathes verticillata verticillata Brook, holotype (ZMUC ANT-208); height ~80 cm (Brook, 1889) (Note: scale not available); B. A. verticillata mauiensis subsp. nov., holotype (USNM 1150095), scale bar = 10 cm.Published as part of Opresko, D. M., Wagner, D., Montgomery, A. D. & Brugler, M. R., 2012, Discovery of Aphanipathes verticillata (Cnidaria: Anthozoa: Antipatharia) in the Hawaiian Islands, pp. 24-39 in Zootaxa 3348 (1) on page 27, DOI: 10.11646/zootaxa.3348.1.2, http://zenodo.org/record/525170
Aphanipathes Brook 1889
No full textAphanipathes Brook 1889 Type species. Aphanipathes sarothamnoides Brook 1889 (see Opresko 2004 for discussion). Diagnosis. Colony sparsely to densely, irregularly branched, bushy, sometimes broom-like, with short to long, straight or curved, often ascending branches. Branches not pinnulated.Published as part of Opresko, D. M., Wagner, D., Montgomery, A. D. & Brugler, M. R., 2012, Discovery of Aphanipathes verticillata (Cnidaria: Anthozoa: Antipatharia) in the Hawaiian Islands, pp. 24-39 in Zootaxa 3348 (1) on page 26, DOI: 10.11646/zootaxa.3348.1.2, http://zenodo.org/record/525170
Antipathidae Ehrenberg 1834
No full textANTIPATHIDAE Ehrenberg, 1834 <p> The order Antipatharia has been the subject of an ongoing taxonomic revision (see Opresko 2001, 2002, 2003a, 2004). Several new families and subfamilies have been established, and one of the characters that is providing valuable insight into the taxonomic relationships within the order is the morphology of the living polyps, i.e., the size and proportional dimensions along the transverse and sagittal axes, as well as the size and shape of the tentacles. Information on these parameters has only rarely been available for earlier described species. Many species and genera were established solely on the basis of skeletal characters, and even in cases where polyps were present, because of contraction of the soft tissue, their appearance may have been altered after preservation. With the increased use of submersibles and remotely operated vehicles (ROVs) for collecting and filming, it has become more and more common for black corals to be observed <i>in situ</i> and also collected alive, thus providing valuable opportunites to record the morphology of the living polyps. As more information on living species is documented, the natural affinities within the order will hopefully become clearer.</p> <p>As a result of the above mentioned revisions, many species and even several genera previously included within the family Antipathidae have now been re­assigned. Consequently, the family has, by default, undergone considerable modification and condensation. Further work is still needed to clearly define the limits of the family and to establish valid generic level taxa.</p>Published as part of <i>Opresko, D. M., 2005, A new species of antipatharian coral (Cnidaria: Anthozoa: Antipatharia) from the southern California Bight, pp. 1-10 in Zootaxa 852</i> on page 2, DOI: <a href="http://zenodo.org/record/273210">10.5281/zenodo.273210</a>
Antipathes Pallas 1766
No full text<i>Antipathes</i> Pallas, 1766 <p> <b>Diagnosis</b>. Corallum sparsely to densely branched; bushy or flabellate; rarely monopodial. Branchlets of varying length; arranged irregularly, or bilaterally; rarely pinnulate. Spines usually triangular to conical in lateral view, smooth or papillose; often laterally compressed; sometimes with knobs or multiple forking at the apex. Polyps from about 1 to 3 mm in transverse diameter, sometimes longer along the sagittal axis than along the tranverse axis.</p> <p> <b>Type species</b>. <i>Antipathes dichotoma</i> Pallas,1766.</p> <p> <b>Type material</b>. A neotype has recently been established for <i>Antipathes dichotoma</i> (see Opresko 2003b). The type species is characterized by having relatively large polyps (up to 2 mm in transverse diameter), a rather sparsely and irregularly branched corallum, and large, smooth spines.</p> <p> <b>Remarks</b>. Although many species formerly referred to <i>Antipathes</i> have now been reassigned to other genera in two newly established families (Myriopathidae and Aphanipathidae), the genus still contains species of very diverse morphology. It is likely that with further taxonomic revisions species in this genus will be recategorized, primarily on the basis of the morphology of the polyps and on the growth form of the corallum, and, it is quite possible that some species now assigned to <i>Antipathes</i> may be removed from the family.</p>Published as part of <i>Opresko, D. M., 2005, A new species of antipatharian coral (Cnidaria: Anthozoa: Antipatharia) from the southern California Bight, pp. 1-10 in Zootaxa 852</i> on page 2, DOI: <a href="http://zenodo.org/record/273210">10.5281/zenodo.273210</a>
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
- …
