Neoschizodus Giebel 1855
Genus Neoschizodus Giebel, 1855 Type species. Lyrodon laevigatum (Goldfuss, 1837), Anisian, Middle Triassic, Rudersdorf, Germany. Diagnosis. The diagnosis follows Newell & Boyd (1975). Orthogyrous to moderately prosogyrous shell with slightly incurved beak. Posterior ridge angular to subangular...
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| Format: | Other/Unknown Material |
| Language: | unknown |
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Zenodo
2016
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| Online Access: | https://doi.org/10.5281/zenodo.10883118 http://treatment.plazi.org/id/C53B0B4D805DE8256EC4FABC8CA722CC |
| Summary: | Genus Neoschizodus Giebel, 1855 Type species. Lyrodon laevigatum (Goldfuss, 1837), Anisian, Middle Triassic, Rudersdorf, Germany. Diagnosis. The diagnosis follows Newell & Boyd (1975). Orthogyrous to moderately prosogyrous shell with slightly incurved beak. Posterior ridge angular to subangular in transverse profile. Myophorian hinge; teeth and sockets smooth or bearing transverse striations. Remarks. These specimens have most of the required diagnostic criteria for assignment to Neoschizodus : an orthogyrate to moderately prosogyrate shell with an incurved beak and a posterior ridge angular to subangular in transverse. The nymph, teeth and umbonal platform were not present in these specimens so it is not known whether these specimens possess the myophorian hinge that is also diagnostic of this genus. These specimens do, however, have a similar external morphology to other Early and Middle Triassic specimens assigned to Neoschizodus (e.g. Kumagae & Nakazawa 2009) and are, therefore, referred to this genus. Published as part of Foster, William J., Danise, Silvia & Twitchett, Richard J., 2017, A silicified Early Triassic marine assemblage from Svalbard, pp. 851-877 in Journal of Systematic Palaeontology 15 (10) on page 863, DOI:10.1080/14772019.2016.1245680, http://zenodo.org/record/10883052 |
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