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1,492 results for “species delimitation”
FIGURE 58 in Revision of the subgenus Stegana (Steganina) from China, with assessment of species delimitation using DNA barcodes (Diptera, Drosophilidae)
FIGURE 58. Stegana (Steganina) rava Cui & Chen, sp. nov., male terminalia. A. Epandrium, surstylus, and cercus in lateral view; B. Surstylus in ventral view; C, D. Hypandrium, pregonite, aedeagus, and phallapodeme in ventral and lateral views; E, F. Aedeagal sheath in ventral and lateral views; G. Subepandrial sclerite in ventral view.
FIGURE 39 in Revision of the subgenus Stegana (Steganina) from China, with assessment of species delimitation using DNA barcodes (Diptera, Drosophilidae)
FIGURE 39. Stegana (Steganina) formosa Zhang & Chen, sp. nov., male terminalia. A. Epandrium, surstylus, and cercus in lateral view; B. Surstylus in ventral view; C, D. Hypandrium, pregonite, aedeagus, phallapodeme, and aedeagal sheath in ventral and lateral views; E. Subepandrial sclerite in ventral view.
FIGURE 37 in Revision of the subgenus Stegana (Steganina) from China, with assessment of species delimitation using DNA barcodes (Diptera, Drosophilidae)
FIGURE 37. Stegana (Steganina) flabella Li & Chen, sp. nov., male terminalia. A. Epandrium, surstylus, and cercus in lateral view; B. Surstylus in ventral view; C, D. Hypandrium, pregonite, aedeagus, and phallapodeme in ventral and lateral views; E, F. Aedeagal sheath in ventral and lateral views; G. Subepandrial sclerite in ventral view.
FIGURE 28 in Revision of the subgenus Stegana (Steganina) from China, with assessment of species delimitation using DNA barcodes (Diptera, Drosophilidae)
FIGURE 28. Stegana (Steganina) baoxing Li & Chen, sp. nov., male terminalia. A. Epandrium, surstylus, and cercus in lateral view; B, C. Hypandrium, pregonite, aedeagus, and phallapodeme in ventral and lateral views; D, E. Aedeagal sheath in ventral and lateral views; F. Subepandrial sclerite in ventral view.
FIGURE 45 in Revision of the subgenus Stegana (Steganina) from China, with assessment of species delimitation using DNA barcodes (Diptera, Drosophilidae)
FIGURE 45. Stegana (Steganina) kanda Cui & Chen, sp. nov., male terminalia. A. Epandrium, surstylus, and cercus in lateral view; B, C. Hypandrium, pregonite, aedeagus, and phallapodeme in ventral and lateral views; D, E. Aedeagal sheath in ventral and lateral views; F. Subepandrial sclerite in ventral view.
FIGURE 35 in Revision of the subgenus Stegana (Steganina) from China, with assessment of species delimitation using DNA barcodes (Diptera, Drosophilidae)
FIGURE 35. Female terminalia in Stegana (Steganina) curvitabulata Cui & Chen, sp. nov. (A–C) and S. (S.) daiya Cui &
FIGURE 21 in Revision of the subgenus Stegana (Steganina) from China, with assessment of species delimitation using DNA barcodes (Diptera, Drosophilidae)
FIGURE 21. Stegana (Steganina) marenubila Cui & Chen, sp. nov., male terminalia. A. Epandrium, surstylus, and cercus in lateral view; B, C. Hypandrium, aedeagus, phallapodeme, and aedeagal sheath in ventral and lateral views; D. Subepandrial sclerite in ventral view.
FIGURE 1-2 in Revision of the subgenus Stegana (Steganina) from China, with assessment of species delimitation using DNA barcodes (Diptera, Drosophilidae)
FIGURE 1-2. An un-rooted, neighbor-joining (NJ) tree constructed using 435 DNA barcode sequences of 102 Steganina species. Numbers around the nodes are bootstrap percentages (BPs). BPs lower than 50 are not shown. The bar indicate the estimated number of substitutions per site.
FIGURE 1 in Species delimitation in the Chlorophytum andongense complex
FIGURE 1. Photographs of plants in the "the paniculate spongy-rooted group" in the genus Chlorophytum. A) Chlorophytum macrosporum, B) inflorescence part of Chlorophytum andongense, C) flower of Chlorophytum andongense, D) spongy roots of Chlorophytum viridescens E) Flower of Chlorophytum macrosporum F) Leaves of Chloropytum macrosporum G) Leaves of Chlorophytum andongense. Photographed by: Karsten Sund (A, C), Charlotte S. Bjorå (B, E, F, G), Inger Nordal (D).
FIGURE 3 in Chameleonfishes in Bangladesh: hipshot taxonomy, sibling species, elusive species, and limits of species delimitation (Teleostei: Badidae)
FIGURE 3. Collecting sites of species of Badis and Dario in Bangladesh.
FIGURE 9 in Delimitation and description of three new species of Himalopsyche (Trichoptera: Rhyacophilidae) from the Hengduan Mountains, China
FIGURE 9. Map of sampling localities of Himalopsyche spp. belonging to the H. excisa-Complex.
Re-evaluating the genetic variation of the COI gene of Insecta: Implications for DNA barcoding, metabarcoding and species delimitation studies
<p>To analyze the genetic variation of the <i>cytochrome c oxidase subunit I</i> (<i>COI</i>) gene of Insecta, the <i>COI</i> data of Insecta was downloaded from GenBank and the intraspecific Kimura-2 -parameter (K2P) distance of 40,782 species was calculated (each species with three or more sequences). Our result indicated that the maximum intraspecific genetic distance of 8,928 (21.89%) species was over 3%. Using a threshold of 3% in the clustering analysis, 7,123 (17.47%) species can be divided into two or more clusters. We also analyzed 3,189 genera with over three species (25,283 species) and found that the optimal thresholds for these genera ranged from 0.1%-15.7% (average value: 0.03531, median value: 0.02900). In clustering analysis, if the threshold values were set to 0.01, 0.02, 0.022, and 0.03, the numbers of clusters were 39,860, 31,024, 29,954, and 26,527, respectively. In metabarcoding studies, a threshold of 0.03 was recommended to estimate the species diversity of insects in a certain environment. However, using the empirical thresholds mentioned above for operational taxonomic unit (OTU) picking, the average match ratios of the 3,189 genera were 0.5137, 0.6338, 0.6440, and 0.6587. By contrast, if the possible thresholds from the distance matrix, the minimum interspecific genetic distance of congeneric species, and the optimal thresholds were used in clustering analysis, the average match ratios of them were 0.6626 0.7530, and 0.7549. Herein, we recommended the utilizations of the minimum interspecific genetic distance (when it was greater than or equal to 2%) and the optimal thresholds for OTU picking in DNA barcoding and species delimitation studies based on the <i>COI</i> gene of insects.</p>
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International Brain Laboratory public data
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OpenNeuro
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