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3 results for “Metapolygnathus”
Fig. 2 in A new Metapolygnathus platform conodont species and its implications for Upper Carnian global correlations
Fig. 2. SEM photographs of gondolellid conodonts. A. Holotype of Paragondolella noah (Hayashi, 1968). B. Holotype of Metapolygnathus communisti Hayashi, 1968 from the original plates of Hayashi (1968: 79, pl. 3). Both specimens are from chert at the base of the Adoyama Formation within a mixed Middle–Upper Triassic fauna (Ashio Mountains, Central Japan). C–J. Metapolygnathus praecommunisti sp. nov. from the Upper Triassic of "Calcari con Selce", Pizzo Mondello section (Sicani Mountains, Sicily). C. Holotype (sample NA12). D, E. Asymmetric morphotypes, samples NA14 and NA18 respectively. F, G. Rounded morphotypes, samples PM11A and NA19 respectively. H, I. More advanced forms with short platform (sample NA19). J. Advanced form, NA19 (from Mazza et al. 2010).
Fig. 4. A in A new Metapolygnathus platform conodont species and its implications for Upper Carnian global correlations
Fig. 4. A schematic figure illustrating the evolution of Paragondolella noah (Hayashi, 1968) into its descendant species. The main evolutionary trends from P. noah to the last representative of the lineage, Metapolygnathus parvus Kozur, 1972, are observable: the gradual shortening of the platform, the forward shifting of the pit, the posterior lengthening of the keel termination and the development of nodes at the geniculation point. In M. parvus the nodes disappear for the extreme reduction of the platform. A, B. Metapolygnathus parvus Kozur, 1972 (sample NA37, Lower Norian, PMs). C, D. Metapolygnathus communisti Hayashi, 1968 (samples NA39 and PM27 respectively, Lower Norian, PMs). Metapolygnathus praecommunisti sp. nov. from the Upper Carnian of the PMs and P2s: E, F. Very advanced specimens (samples NA22 and NA19 respectively, PMs). G, H. Intermediate specimens (samples NA12 and NA14 respectively, PMs). I, J. Primitive specimens (sample P25 of P2s and sample NA8 of PMs respectively). K, L. Paragondolella noah (sample NA2 of PMs and sample P21 of P2s respectively). Abbreviations: PMs, Pizzo Mondello section; P2s, Pignola 2 section.
Fig. 3 in A new Metapolygnathus platform conodont species and its implications for Upper Carnian global correlations
Fig. 3. SEM photographs of gondolellid conodonts Metapolygnathus praecommunisti sp. nov. from the Calcari con Selce of the Pizzo Mondello section (Sicani Mountains, Sicily) (A, C, D, F–H) and from the Upper Triassic of Calcari con Selce of the Pignola 2 section (southern Apennines, Basilicata) (B, E). A–C. Primitive forms, closer to Paragondolella noah (Hayashi, 1968), samples NA8, P25 and FNP53 respectively. D, E. Late juvenile growth stage, samples NA15A and P34 respectively. F. Advanced form, sample PM11A. G, H. Extremely mature stages, samples NA11 and PM11A.
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