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690 results for “Geometric morphometrics”
Figure 3 in Dealing with allometry in linear and geometric morphometrics: a taxonomic case study in the Leporinus cylindriformis group (Characiformes: Anostomidae) with description of a new species from Suriname
Figure 3. Leporinus apollo sp. nov., FMNH 116827, holotype, 111.1 mm standard length; Suriname, Saramacca, Coppename River, Sidonkrutu, sand island and channel.
Figure 8 in Dealing with allometry in linear and geometric morphometrics: a taxonomic case study in the Leporinus cylindriformis group (Characiformes: Anostomidae) with description of a new species from Suriname
Figure 8. Scatterplot of principal components one and two from geometric morphometric analysis without allometric correction for species of Leporinus discussed in text. Both axes show significant correlations with log centroid size.
Figure 11 in Dealing with allometry in linear and geometric morphometrics: a taxonomic case study in the Leporinus cylindriformis group (Characiformes: Anostomidae) with description of a new species from Suriname
Figure 11. Scatterplot of (A) principal components one and two and (B) principal components one and three from geometric morphometrics after allometric correction. Polygons represent convex hulls surrounding nominal species of Leporinus.
Figure 6 in Dealing with allometry in linear and geometric morphometrics: a taxonomic case study in the Leporinus cylindriformis group (Characiformes: Anostomidae) with description of a new species from Suriname
Figure 6. Scatterplot of principal component two (PC2) versus one from traditional linear morphometrics for species of Leporinus discussed in text. PC1 is an allometric vector describing size and shape variation, whereas PC2 is essentially size-free. Polygons indicate convex hulls.
Figure 16 in The evolution of Metriorhynchoidea (mesoeucrocodylia, thalattosuchia): an integrated approach using geometric morphometrics, analysis of disparity, and biomechanics
Figure 16. Principle coordinates morphospace subdivided into four time bins: (A) Middle Jurassic (Bajocian–Callovian); (B) Oxfordian–Kimmeridgian; (C) Tithonian; (D) Early Cretaceous (Berriasian–Valanginian). The black ellipse contains the metriorhynchine taxa, whereas the grey ellipse contains the Geosaurinae.
Figure 7 in The evolution of Metriorhynchoidea (mesoeucrocodylia, thalattosuchia): an integrated approach using geometric morphometrics, analysis of disparity, and biomechanics
Figure 7. Metriorhynchoidea phylogeny, with dental characters mapped. The thin branches refer to smooth carinated crowns, whereas the bold black lines refer to denticulate carinae. The bold grey indicates crowns lacking carinae. The symbols refer to tooth morphology guilds from Massare (1987) and Ciampaglio et al. (2005).
Figure 4. Comparative metriorhynchid cranial morphology. A in The evolution of Metriorhynchoidea (mesoeucrocodylia, thalattosuchia): an integrated approach using geometric morphometrics, analysis of disparity, and biomechanics
Figure 4. Comparative metriorhynchid cranial morphology. A, Eoneustes gaudryi comb. nov., holotype, NHM R.3353. B, Geosaurus araucanensis, holotype, MLP 72-IV-7-1. C, Cricosaurus suevicus, lectotype, SMNS 9808. D, Enaliosuchus schroederi, holotype, MMGLV#. E, Suchodus durobrivensis, referred specimen, NHM R.2618. F, Metriorhynchus superciliosus, referred specimen, MNHN 1908-6. G, Geosaurus giganteus, referred specimen, NHM 37020. H, Dakosaurus maximus, neotype, SMNS 8203. Scale bars: 20 mm. We thank N. Knötschke for photograph (D), and P. Hurst and P.M. Barrett for photograph (G).
Figure 3 in The evolution of Metriorhynchoidea (mesoeucrocodylia, thalattosuchia): an integrated approach using geometric morphometrics, analysis of disparity, and biomechanics
Figure 3. Metriorhynchoidea phylogeny, with character complexes relating to marine adaptation mapped by shading. The light-grey shading indicates taxa demonstrating the 'typical' adaptations of metriorhynchids, i.e. hypocercal tails, no osteoderms, and no external mandibular fenestrae. The mid-grey shading refers to taxa with dorsally inclined paroccipital processes and verticalized squamosals; whereas the dark-grey shading highlights taxa with streamlined crania (lateral processes of the frontal reoriented caudally, creating an acute angle between the medial and lateral processes of the frontal) and more flattened humeri.
Figure 6 in The evolution of Metriorhynchoidea (mesoeucrocodylia, thalattosuchia): an integrated approach using geometric morphometrics, analysis of disparity, and biomechanics
Figure 6. Lateral aspect cranial reconstructions, with the muscle line of action indicated: (A) Teleidosaurus calvadosii (modified from Eudes-Deslongchamps, 1867–1869); (B) Metriorhynchus superciliosus (composite based upon specimens from NHM and MNHN). The broken line represents the musculus pseudotemporalis–intramandibularis, whereas the solid black line is the musculus depressor mandibulae. The pterygoids are reconstructed based upon teleosaurids.
Figure 15 in The evolution of Metriorhynchoidea (mesoeucrocodylia, thalattosuchia): an integrated approach using geometric morphometrics, analysis of disparity, and biomechanics
Figure 15. Rarefaction plots for two metrics (sum of ranges and sum of variances) that measure metriorhynchoid disparity (all taxa) throughout time. A, sum of ranges. B, sum of variances. The sum of variances shows little obvious relationship with sample size, in keeping with the theoretical robustness of the measure to differences in sample size (see Wills et al., 1994). The sum of ranges curve suggests that, although this measure is highly sensitive to sample size (Wills et al., 1994), the patterns for metriorhynchoids are robust. Notably, the relative ordering of disparity measures from high (Tithonian) to low (Bathonian) is seen at all sample sizes, from N = 3 upwards. Abbreviations: B, Bathonian; C, Callovian; EK, Early Cretaceous; K, Kimmeridgian; O, Oxfordian; T, Tithonian.
Figure 5 in The evolution of Metriorhynchoidea (mesoeucrocodylia, thalattosuchia): an integrated approach using geometric morphometrics, analysis of disparity, and biomechanics
Figure 5. Postcranial marine adaptations of metriorhynchids (Rhacheosaurus gracilis NHM R.3948): (A) tail fluke with an impression of the fleshy upper lobe (the only specimen preserving this feature); (B) hindlimbs, note the high proportion that the pes makes, compared with the tibia–fibula, and how poorly developed the pelvis is.
Figure 8 in The evolution of Metriorhynchoidea (mesoeucrocodylia, thalattosuchia): an integrated approach using geometric morphometrics, analysis of disparity, and biomechanics
Figure 8. Comparative metriorhynchid dental morphology: (A) in situ crowns of Geosaurus giganteus NHM R.1229; (B) isolated crown of Dakosaurus maximus HMN R.4313; (C) in situ crowns of Suchodus durobrivensis NHM R.2618; (D) isolated crown of Suchodus brachyrhynchus HMN R.3386.2; (E) in situ crowns of Cricosaurus schroederi MMGLV#; (F) isolated crowns of Metriorhynchus superciliosus NMW 19 96 G15a. Scale bars: 10 mm. We thank for N. Knötschke for photograph (E).
Figure 2 in The evolution of Metriorhynchoidea (mesoeucrocodylia, thalattosuchia): an integrated approach using geometric morphometrics, analysis of disparity, and biomechanics
Figure 2. Strict consensus of Metriorhynchoidea from Young & Andrade (2009), calibrated by Tethys ammonite zones. See the Appendix for further details regarding genera and taxonomy.
Figure 17 in The evolution of Metriorhynchoidea (mesoeucrocodylia, thalattosuchia): an integrated approach using geometric morphometrics, analysis of disparity, and biomechanics
Figure 17. von Mises stress contour plots for each taxon placed within the phylogenetic context. The left-hand models are those in dorsal aspect (with the appropriate scale), whereas those on the right are the lateral-aspect models (with their own respective scale).
Figure 14 in The evolution of Metriorhynchoidea (mesoeucrocodylia, thalattosuchia): an integrated approach using geometric morphometrics, analysis of disparity, and biomechanics
Figure 14. The disparity (morphological diversity) of metriorhynchoids through time, based on two metrics (sum of ranges and sum of variances, derived from a PCO analysis; see text for details). A, B, disparity of all metriorhynchoids through time. C, D, disparity of metriorhynchines through time. E, F, disparity of geosaurines through time. Squares represent the disparity metric and error bars denote 95% confidence intervals, based on bootstrapping. There are no error bars for the Early Cretaceous geosaurines because of the small sample size (N = 2).
Figure 9 in The evolution of Metriorhynchoidea (mesoeucrocodylia, thalattosuchia): an integrated approach using geometric morphometrics, analysis of disparity, and biomechanics
Figure 9. Species diversity of Metriorhynchoidea (both taxic and phylogenetically corrected) for each stage subdivision.
Figure 13 in The evolution of Metriorhynchoidea (mesoeucrocodylia, thalattosuchia): an integrated approach using geometric morphometrics, analysis of disparity, and biomechanics
Figure 13. Principle coordinates cladistic character morphospace, delimited by the first two axes. The black ellipse contains the metriorhynchine taxa, whereas the grey ellipse contains the Geosaurinae.
Figure 12 in The evolution of Metriorhynchoidea (mesoeucrocodylia, thalattosuchia): an integrated approach using geometric morphometrics, analysis of disparity, and biomechanics
Figure 12. Relative warps morphospace subdivided into three time bins: (A) Callovian; (B) Oxfordian–Kimmeridgian; (C) Tithonian–Berriasian.
Supplementary data to "Geometric morphometrics shows a close relationship between the shape features, position on thalli, and CaCO3 content of segments in Halimeda tuna (Bryopsidales, Ulvophyceae)"
<p>zenodo-landmarks: Landmark coordinates of segment outlines of Halimeda tuna used in the geometric morphometric analyses.</p> <p>zenodo-designation: Designation of individual segments in the order corresponding to the landmark data file.</p> <p>zenodo-script-shape: The script executing the multivariate linear Procrustes ANOVA model decomposing the shape data of Halimeda tuna segments into different sources.</p> <p>zenodo-script-areas: The script computing the areas of Halimeda tuna segments based on their outline morphometric data.</p> <p> </p>
Figure 3 in Using 3D geometric morphometrics to aid taxonomic and ecological understanding of a recent speciation event within a small Australian marsupial (Antechinus: Dasyuridae)
Figure 3. Pairwise comparisons between mean shapes of each clade (Antechinus stuartii south vs. A. stuartii north, P = 0.003; A. stuartii north vs. A. subtropicus, P = 0.003; A. stuartii south vs. A. subtropicus, P = 0.003; all p-values were adjusted with following the Bonferroni method). The 3D images are the specimen closest to the overall mean warped correspondingly to the mean shapes of each clade. Tukey post-hoc analyses of linear measurements after size correction were performed; significance levels (*P <0.05, **P <0.01, ***P <0.001) are shown in the boxplots. For each comparison, we have labelled the best differentiator diagnostic; i.e. the size of the major palatine foramina (mapf) for differentiating A. stuartii south and A. stuartii north, the size of the incisive foramina (inf) for differentiating A. stuartii north and A. subtropicus, and the interpalatal distance (intp) for differentiating between the three clades. Clades are consistently labelled as per Figure 1.
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