Type species: Dekayia aspera Milne-Edwards & Haime, 1851
This genus includes the species:
| Dekayia angularis | (Ulrich & Bassler, 1904) | Late Ordovician Ashgillian | USA (Ohio) |
| Dekayia appressa | Ulrich, 1883 | Late Ordovician | USA |
| Dekayia aspera | Milne-Edwards & Haime, 1851 | Late Ordovician | USA, Russia |
| Dekayia asperula | (Ulrich, 1882) | Late Ordovician | USA (Ohio) |
| Dekayia catenulata | (Cumings & Galloway, 1913) | Late Ordovician | USA, Canada |
| Dekayia crassa | Bassler, 1927 (1928?) | Late Ordovician | Canada |
| Dekayia crenulata | Prantl, 1940 | Late Ordovician | France |
| Dekayia distincta | Fritz, 1926 | Late Ordovician | Canada (Ontario) |
| Dekayia epetrima | Karklins, 1984 | Late Ordovician | USA (Kentucky) |
| Dekayia frankfortensis | (Ulrich & Bassler, 1904) | Late Ordovician | USA (Kentucky) |
| Dekayia granulosa | Fritz, 1926 | Late Ordovician | Canada (Ontario) |
| Dekayia gregaria | (Ulrich, 1883) | Late Ordovician | USA, Russia |
| Dekayia inflecta | (Ulrich, 1890) | Late Ordovician | USA |
| Dekayia lambtonensis | (Parks & Dyer, 1922) | Late Ordovician | Canada |
| Dekayia maculata | James, 1881 | Late Ordovician | USA |
| Dekayia magna | Cumings, 1901 | Late Ordovician | USA |
| Dekayia meafordensis | Fritz, 1926 | Late Ordovician | Canada (Ontario) |
| Dekayia mesospinosa | Brown & Daly, 1985 | Late Ordovician | USA |
| Dekayia minima | Conti, 1990 | Ordovician | Sardinia |
| Dekayia multispinosa | Ulrich, 1882 | Late Ordovician | USA |
| Dekayia nicklesi | (Ulrich & Bassler, 1904) | Late Ordovician | USA (Ohio) |
| Dekayia offula | (Ulrich & Bassler, 1904) | Late Ordovician Ashgill | USA (Ohio) |
| Dekayia pelliculata | Ulrich, 1882 | Late Ordovician | USA |
| Dekayia pengawsensis | Buttler, 1991 | Late Ordovician | Wales |
| Dekayia primaria | Modzalevskaya, 1977 | Ordovician | Russia |
| Dekayia pulaskiensis | (Ruedemann, 1925) | Late Ordovician | USA |
| Dekayia pulchella | Hu, 1986 | Late Ordovician | China |
| Dekayia ramosa | Trizna, 1958 | L. Carboniferous Tournaisian | Russia |
| Dekayia scabiosa | (Ulrich, 1889) | Late Ordovician Ashgillian | Canada (Manitoba) |
| Dekayia semipilaris | (Ulrich, 1890) | Late Ordovician | USA |
| Dekayia stidhami | (Ulrich, 1890) | Late Ordovician | USA |
| Dekayia sugarensis | Ross, 1969 | Late Ordovician | USA |
| Dekayia tenuis | Hu, 1986 | Late Ordovician | China |
| Dekayia typica | Fritz, 1957 | Late Ordovician | Canada |
| Dekayia vana | Trizna, 1958 | L. Carboniferous Tournaisian | Russia |
This information is based upon various sources, but no personal knowledge. I am indebted to the late Alan Horowitz for his compilation, and to Dr. J. Pachut.
I would be grateful for corrections to, or critical reviews of this information. This is not a 'final' version (an impossible ideal), but a working document.
Dekayia at University of Georgia.
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