Pelagiellida

Cladus: Eukaryota
Supergroup: Opisthokonta
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Spiralia
Cladus: Lophotrochozoa
Phylum: Mollusca
Classis: Monoplacophora
Ordo: † Pelagiellida
Familiae: Aldanellidae - Pelagiellidae

The Pelagiellida are a group of Cambrian molluscs superficially assigned to the (polyphyletic) Monoplacophora, although their true taxonomic affinities within the Mollusca are unknown.[1]

References

1. ^ Fortey, R. A.; Briggs, D. E. G.; Wills, M. A. (1996). "The Cambrian evolutionary ‘explosion’: decoupling cladogenesis from morphological disparity". Biological Journal of the Linnean Society 57: 13. doi:10.1111/j.1095-8312.1996.tb01693.x.