Traits taxon details
original description
Chen, J. (1976). Advances in the Ordovician stratigraphy of North China with a brief description of nautiloid fossils. <em>Acta Palaeontologica Sinica.</em> 15: 55–74, pls 1–3 [Chinese with English abstract]. [details]
basis of record
Niko, S.; Sone, M.; Leman, M. S. (2019). Ordovician Orthocerida and Pseudorthocerida (Cephalopoda: Nautiloidea) from the Lower Setul Limestone of the Langkawi Islands, Malaysia. <em>Journal of Systematic Palaeontology.</em> 18(5): 381-414., available online at https://doi.org/10.1080/14772019.2019.1608599 page(s): 394 [details] Available for editors
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