1,720,992 research outputs found
The evolution of the scalation pattern in temnospondyl amphibians
No full textWitzmann, F. (2007): The evolution of the scalation pattern in temnospondyl amphibians. Zoological Journal of the Linnean Society 150 (4): 815-834, DOI: 10.1111/j.1096-3642.2007.00309.x, URL: https://academic.oup.com/zoolinnean/article-lookup/doi/10.1111/j.1096-3642.2007.00309.
Figure 1 in The evolution of the scalation pattern in temnospondyl amphibians
No full textFigure 1. Schematic drawing of gastral scales in the anterior region of the belly in a temnospondyl illustrating the terms 'row', 'anteriorly directed chevron', and 'posteriorly directed chevron'.Published as part of Witzmann, F., 2007, The evolution of the scalation pattern in temnospondyl amphibians, pp. 815-834 in Zoological Journal of the Linnean Society 150 (4) on page 817, DOI: 10.1111/j.1096-3642.2007.00309.x, http://zenodo.org/record/543195
Figure 3. Ovoid gastral scales. A in The evolution of the scalation pattern in temnospondyl amphibians
No full textFigure 3. Ovoid gastral scales. A, Branchierpeton amblystomus. Gastral scales articulating in the ventral midline, redrawn after Werneburg (1991). B, Sclerocephalus haeuseri, MB.Am.1302. Gastral scale. C, Trimerorhachis insignis, MCZ 1080. Posterior part of interclavicle with gastral scales in ventral view.Published as part of Witzmann, F., 2007, The evolution of the scalation pattern in temnospondyl amphibians, pp. 815-834 in Zoological Journal of the Linnean Society 150 (4) on page 820, DOI: 10.1111/j.1096-3642.2007.00309.x, http://zenodo.org/record/543195
Figure 4. Spindle-shaped gastral scales. A, B in The evolution of the scalation pattern in temnospondyl amphibians
No full textFigure 4. Spindle-shaped gastral scales. A, B, Archegosaurus decheni, MB.Am.289. A, gastral scales in ventral view. B, gastral scales in dorsal view. C, Dendrerpeton sp., MCZ 8779. Two gastral scales in dorsal view plus isolated dorsal scale. D, Eryops megacephalus, MCZ 1738. Gastral scales in dorsal view. E, Plagiosuchus pustuliferus, SMNS 84794. Gastral scales with small, globular osteoderms in dorsal view.Published as part of Witzmann, F., 2007, The evolution of the scalation pattern in temnospondyl amphibians, pp. 815-834 in Zoological Journal of the Linnean Society 150 (4) on page 822, DOI: 10.1111/j.1096-3642.2007.00309.x, http://zenodo.org/record/543195
Figure 5. Rhombic gastral scales. A, B in The evolution of the scalation pattern in temnospondyl amphibians
No full textFigure 5. Rhombic gastral scales. A, B, Platyoposaurus stuckenbergi, PIN 164/1–9. A, isolated gastral scale, probably from the anterior part of the trunk, in anteroventral (left) and anterodorsal view (right). B, isolated gastral scale, probably from the posterior part of the trunk, in anteroventral (left) and anterodorsal view (right). C, D, Sclerocephalus haeuseri, SMNS 90507. C, gastral scales articulating in the ventral midline, ventral view. D, articulating gastral scales in ventral view.Published as part of Witzmann, F., 2007, The evolution of the scalation pattern in temnospondyl amphibians, pp. 815-834 in Zoological Journal of the Linnean Society 150 (4) on page 823, DOI: 10.1111/j.1096-3642.2007.00309.x, http://zenodo.org/record/543195
Figure 7 in The evolution of the scalation pattern in temnospondyl amphibians
No full textFigure 7. Scalation pattern in temnospondyls mapped on an existing cladogram based on the results of Witzmann & Schoch (2006) and Schoch & Milner (2000). Characters: 1, presence of gastral scales arranged in a chevron pattern; 1a, rhombic gastral scales; 1b, spindle-shaped gastral scales; 1c, ovoid gastral scales; 2, dorsal scales overlapping on the trunk; 3, dorsal scales not overlapping on the trunk; 4, complete reduction of scales. *Taxa in which no dorsal scales are known; **taxa in which no gastral scales are known.Published as part of Witzmann, F., 2007, The evolution of the scalation pattern in temnospondyl amphibians, pp. 815-834 in Zoological Journal of the Linnean Society 150 (4) on page 827, DOI: 10.1111/j.1096-3642.2007.00309.x, http://zenodo.org/record/543195
Figure 6. Dorsal scales. A, B in The evolution of the scalation pattern in temnospondyl amphibians
No full textFigure 6. Dorsal scales. A, B, Archegosaurus decheni, MB.Am.273. A, scales of the flanks in the region of the ilium. B, scales of the tail, showing concentric rings and radial striae. C, Sclerocephalus haeuseri, MB.Am.1314. Scales of the tail. D, schematic reconstruction of the arrangement of dorsal scales in Sclerocephalus haeuseri (left), schematic reconstruction of the arrangement of dorsal scales in the sacral region of Archegosaurus decheni (right). E, Eryops megacephalus, MCZ 1539 (cast). Scales of the tail. F, H, Greererpeton burkemorani. F, CMNH 11233. Dorsal scales in external (above) and internal (below) view. G, CMNH 11219. Dorsal scales showing an imbricating pattern.Published as part of Witzmann, F., 2007, The evolution of the scalation pattern in temnospondyl amphibians, pp. 815-834 in Zoological Journal of the Linnean Society 150 (4) on page 825, DOI: 10.1111/j.1096-3642.2007.00309.x, http://zenodo.org/record/543195
Figure 8 in The evolution of the scalation pattern in temnospondyl amphibians
No full textFigure 8. Ontogeny of gastral scales in Sclerocephalus haeuseri, and interpretation of the gastral scale morphologies of other temnospondyls and the stem-tetrapod Greererpeton burkemorani as 'larval', 'juvenile', and 'adult', respectively. Except for Sclerocephalus, the ontogenetically most advanced stages of gastral scales are shown in each case. Acerastea redrawn after Warren & Hutchinson (1987), Australerpeton redrawn after Dias & Richter (2002), Balanerpeton redrawn after Milner & Sequeira (1994), Branchierpeton redrawn after Werneburg (1991), Gerrothorax redrawn after Nilsson (1946), Greererpeton based on CMNH 11073, Mahavisaurus redrawn after Janvier (1992), Onchiodon redrawn after Credner (1893), Platyoposaurus based on PIN 164/1–9, Sclerocephalus based on MB.Am.1302, MB.Am.1233, and SMNS 90507, Uranocentrodon redrawn after Findlay (1968).Published as part of Witzmann, F., 2007, The evolution of the scalation pattern in temnospondyl amphibians, pp. 815-834 in Zoological Journal of the Linnean Society 150 (4) on page 828, DOI: 10.1111/j.1096-3642.2007.00309.x, http://zenodo.org/record/543195
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
- …
