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| Orthotheca Temporal range: Early Cambrian–Early Devonian PreꞒ Ꞓ O S D C P T J K Pg N | |
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Brachiopoda |
| Class: | †Hyolitha |
| Order: | †Orthothecida |
| Family: | †Orthothecidae Sysoev, 1958 |
| Genus: | †Orthotheca Novák, 1886 |
| Species | |
Others, please add... | |
Orthotheca is a genus of sessile bottom-dwelling hyolith.
References
- ^ Malinky, J. M. (2009). "First Occurrence of Orthotheca Novák, 1886 (Hyolitha, Early Devonian) in North America". Journal of Paleontology. 83 (4): 588–596. Bibcode:2009JPal...83..588M. doi:10.1666/08-164R.1. S2CID 130227630.
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