Orthotheca
| Orthotheca Temporal range:
| |
|---|---|
| Scientific classification | |
| Kingdom: | Animalia |
| 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.