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Orthonychia concavum
Taxonomy
Platyceras (Orthonychia) concavum was named by Hall (1859) [Platyceras (Orthonychia) concavum Hall 1860b]. It is not extant.
It was recombined as Platyceras concavum by Linsley (1994); it was recombined as Orthonychia concavum by Hall (1879), Wagner (2023).
It was recombined as Platyceras concavum by Linsley (1994); it was recombined as Orthonychia concavum by Hall (1879), Wagner (2023).
Sister species lacking formal opinion data