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31 results for “Conodonta”
Fig. 2 in Biogeographic and Biostratigraphic Implications of the Serratognathus bilobatus Fauna (Conodonta) from the Emanuel Formation (Early Ordovician) of the Canning Basin, Western Australia
Fig. 2. Conodont biostratigraphy of the Emanuel Formation (late Tremadocian to early Floian, Early Ordovician) of the Canning Basin, and correlation with coeval successions in other regions in South China (Zhen et al., in press a), North China (An et al., 1983) and western Newfoundland (Stouge & Bagnoli, 1988).
Fig. 6 in Middle Ordovician Drepanoistodus (Vertebrata, Conodonta) from Baltica, with description of three new species
Fig. 6. Light microscopy photographs of selected geniculate elements of species of Drepanoistodus, as outlined herein, from the Lynna River section, Russia. A–D. Drepanoistodus basiovalis (Sergeeva, 1963). A. LO 12476t, inner view, sample LY12-16, L. variabilis Zone. B. Same specimen as A in outer view. C. LO 12477t, inner view, sample LY12-9,L. antivariabilis Zone. D. LO 12478t, inner view, sample LY12-21b, L. variabilis Zone. E–H. Drepanoistodus iommii sp. nov. E. LO 12479T, holotype, inner view, sample LY12-16, L. variabilis Zone. F. Same specimen as E in outer view. G. LO 12480t, inner view, sample LY12-21b, L. variabilis Zone. H. LO 12481t, inner view, sample LY12-3, L. antivariabilis Zone. I–L. Drepanoistodus svendi sp. nov. I. LO 12482t, inner view, sample LY12-13, L. variabilis Zone. J–K. LO 12483T, holotype, inner and outer view, respectively, sample LY12-14, L. variabilis
Fig. 4 in Middle Ordovician Drepanoistodus (Vertebrata, Conodonta) from Baltica, with description of three new species
Fig. 4. Principal Component Analysis (PCA) biplot based on the correlation coefficient showing the position of conodont specimens (abbreviated names, see Table 1) and morphological characters/variables. The latter is represented by blue vector lines (see Table 2), the direction and length of which mark the relative importance of the various characters/variables. Each coloured field marks the position of a selected species grouping. Whereas 18.4% of the total variance is visible along the PC 1 axis, 16.1% is seen along the PC 2 axis. See main text for further explanation on the analyses performed, and consult Table 1 for data on sample numbers.
Fig. 3 in Middle Ordovician Drepanoistodus (Vertebrata, Conodonta) from Baltica, with description of three new species
Fig. 3. Geniculate Drepanoistodus basiovalis (Sergeeva, 1963) element demonstrating the essential morphological characteristics utilized in the present study. Two characters were measured quantitatively: Angle A between the median line (usually carina) of the cusp and the lower margin of the keel situated on the upper margin of the cusp (A); and the b/c ratio, which is the ratio between the length of the upper margin of the base (b) and the length of the free cusp (c).
Fig. 2 in Middle Ordovician Drepanoistodus (Vertebrata, Conodonta) from Baltica, with description of three new species
Fig. 2. The Middle Ordovician stratigraphy of the St. Petersburg region with Baltoscandian and global stratigraphy for comparison (modified from Lindskog et al. 2020, and references therein; additions after Pärnaste et al. 2013; Bauert et al. 2014; Gradstein et al. 2020). The pink area indicates the approximate stratigraphic range of the outcrop at the Lynna River, with ranges of selected Drepanoistodus species indicated. For more detailed information on the local conodont biostratigraphy and ranges of individual species, see Lindskog et al. (2020: fig. 6).
Fig. 1. A in Middle Ordovician Drepanoistodus (Vertebrata, Conodonta) from Baltica, with description of three new species
Fig. 1. A. Map of the St. Petersburg region, Russia, with the distribution of rocks. The red rectangle shows the outline of the map area enlarged in B. B. Map of the Lynna River study locality and its surroundings. Figure modified from Lindskog et al. (2020, and references therein).
FIG. 4 in A new species, Lochriea monocarinata n. sp., and its position in the morphospace of the genus Lochriea Scott, 1942 (Conodonta, Mississippian)
FIG. 4. — Morphospace of the P1 elements of Lochriea Scott, 1942.
Figure 1. A in The evolutionary trend of platform denticulation in Middle Triassic acuminate Gondolellidae (Conodonta)
Figure 1. A) Guexospathodus shagami (Benjamini and Chepstow-Lusty, 1986), holotype BGU-YF 75/1. YF-75, Saharonim Formation, Har Gevanim, Makhtesh Ramon, Israel (late Illyrian). B) Marquezella truempyi (Hirsch, 1971). Right element MGUV-10407. Alós de Balaguer, Spain. C) Marquezella truempyi denticulata (Hirsch, 1971). MHNM 0130. Provence, France. D) Marquezella truempyi denticulata (Hirsch, 1971). MHNM 0127. Provence, France. E) Kirilella mungoensis (Diebel, 1956). Right element. MGUV-10470. Cabo Cope, Murcia, Spain. F) Kirilella mungoensis (Diebel, 1956). Right element. MGUV-10420. Calanda, Teruel, Spain.
Fig. 16 in Biogeographic and Biostratigraphic Implications of the Serratognathus bilobatus Fauna (Conodonta) from the Emanuel Formation (Early Ordovician) of the Canning Basin, Western Australia
Fig. 16. Tropodus australis (Serpagli, 1974). A,B, M element; (A), CPC39914, WCB705/243, posterior view (IY128-032); (B), CPC39915, WCB705/243, anterior view (IY129-007). (C), Sa element, CPC39916, WCB705/243, posterior view (IY128-034). (D), Sb1 element (tricostate), CPC39917, WCB705/243, outer lateral view (IY128-033). E,F, Sb2 element (four costate); (E), CPC39918, WCB705/243, outer lateral view (IY128-038); (F), CPC39919, WCB705/243, inner lateral view (IY128-036). G–I, Sc element; (G), CPC39920, WCB705/243, outer lateral view (IY129-003); (H), CPC39921, WCB705/243, inner lateral view (IY129-022); (I), CPC39922, WCB705/243, inner lateral view (IY118-032). J,K, Sd element, CPC39923, WCB705/243, (J), basal view (IY118-033), (K), basal view close up showing the lamellar structure in the basal cavity (IY118-034). L–N, Pa element; (L), CPC39924, WCB705/243, outer lateral view (IY128-028); (M), CPC39925, WCB705/243, inner lateral view (IY128-022); (N), CPC39926, WCB705/243, inner lateral view (IY128-029). O,P, Pb element, CPC39927, WCB705/243; (O), outer lateral view (IY129-031), (P), basal view (IY129-030). Scale bars 100 µm.
Fig. 5. A in Middle Ordovician Drepanoistodus (Vertebrata, Conodonta) from Baltica, with description of three new species
Fig. 5. A. Results (probabilities) of the nonparametric PERMANOVA test performed on the first seven components of the PCA plot. Drepanoistodus basiovalis (Sergeeva, 1963) and the three new species, D. iommii sp. nov., D. svendi sp. nov. and D. viirae sp. nov. The three tested null hypotheses are that D. basiovalis is similar to each of the three new species, respectively. Because all the test results are below 0.05, the three null hypotheses are rejected, and there is no statistical evidence from the test that the groups (species) are similar. B. Univariate statistics with regard to the measured angle A and the calculated b/c ratio. Abbreviations: N = number of measured specimens; Min = lowest number; Max = highest number; Mean = average; Stand. dev. = standard deviation. All calculations were performed using the PAST software (Hammer et al. 2001).
Figure 2 in The evolutionary trend of platform denticulation in Middle Triassic acuminate Gondolellidae (Conodonta)
Figure 2. Proposed evolutionary lineage of the subfamily Marquezellinae.
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