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Ptychopegma
Taxonomy
Ptychopegma was named by Pojeta et al. (1977) [Sepkoski's age data: O Trem-l O Trem-u Sepkoski's reference number: 543]. It is not extant. Its type is Ptychopegma burgeri.
It was assigned to Ribeiriidae by Pojeta et al. (1977); and to Ribeirioida by Sepkoski (2002).
It was assigned to Ribeiriidae by Pojeta et al. (1977); and to Ribeirioida by Sepkoski (2002).
Species
P. burgeri (type species)