Genus
Ralfia Popov et Khazanovitch, 1989
Aiheeseen liittyvät julkaisut
Holmer, L. E., Popov, L. E. 2000. Class Lingulata. Treatise on Invertebrate Paleontology, part H Brachiopoda, pp. 30-146.
List of species
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Luokittelu
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Brachiopoda |
| Subphylum | Linguliformea |
| Class | Lingulata |
| Order | Lingulida |
| Superfamily | Linguloidea |
| Family | Obolidae |
| Subfamily | Obolinae |
| Genus | Apatobolus |
| Euobolus | |
| Expellobolus | |
| Foveola | |
| Leptembolon | |
| Lingulella | |
| Mytoella | |
| Obolus | |
| Oepikites | |
| Paldiskites | |
| Ralfia | |
| Species | ovata |
| Genus | Rebrovia |
| Schmidtites | |
| Spinilingula | |
| Trigonoglossa | |
| Ungula | |
| Westonia |