Phylum
Onychophora Grube, 1853
List of species
1. Xenusion Pompeckj ,1927 | Lower Cambrian (old nomenclature)
2. Xenusion auerswaldae Pompeckj. 1927 | Lower Cambrian (old nomenclature)
Classification
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Agmata |
| incertae sedis | |
| Annelida | |
| Arthropoda | |
| Brachiopoda | |
| Bryozoa | |
| Chordata | |
| Cnidaria | |
| Echinodermata | |
| Hemichordata | |
| Mollusca | |
| Onychophora | |
| Species | Xenusion |
| Phylum | Pogonophora |
| Porifera | |
| Priapulida | |
| Subphylum | Lophotrochozoa |
| Class | Chitinozoa |
| Order | Hyolithelminthida |