Ussuniidae

Ussuniidae; Temporal range: Ordovician (Llandeilo–lower Caradoc) PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Brachiopoda
Class:	Craniata
Order:	†Trimerellida
Superfamily:	†Trimerelloidea
Family:	†Ussuniidae
Genera
	Ussunia

Ussuniidae is a monogeneric family of Ordovician brachiopods aligned with the Trimerellids, but showing additional similarities to the craniids and considered intermediate in morphology.^[2]^[3]

References

^ Williams, Alwyn; Brunton, C.H.C.; Carlson, S.J.; et al. (1997–2007). Kaesler, Roger L.; Selden, Paul (eds.). Part H, Brachiopoda (Revised). Treatise on Invertebrate Paleontology. Boulder, Colorado; Lawrence, Kansas: Geological Society of America; University of Kansas.
^ Gorjansky, Wladimir; Popov, Leonid (July 1986). "On the origin systematic position of the calcareous-shelled inarticulate brachiopods". Lethaia. 19 (3): 233–240. doi:10.1111/j.1502-3931.1986.tb00737.x.
^ Williams, Alwyn; Brunton, C.H.C.; Carlson, S.J.; et al. (1997–2007). Kaesler, Roger L.; Selden, Paul (eds.). Part H, Brachiopoda (Revised). Treatise on Invertebrate Paleontology. Boulder, Colorado; Lawrence, Kansas: Geological Society of America; University of Kansas.