Ussuniidae is a monogeneric
family of
Ordovician brachiopods aligned with the
Trimerellid
Trimerellida is an Extinction, extinct Order (biology), order of Craniata (brachiopod), craniate brachiopods, containing the Superfamily (biology), superfamily Trimerelloidea and the Family (biology), families Adensuidae, Trimerellidae, and Ussun ...
s, but showing additional similarities to the
craniid
The Craniidae are a family of brachiopods, commonly known as lamp shells. Although it belongs to a subdivision called the inarticulata which have shells where the mineral content consist of calcium phosphate, the Craniidae have shells that cons ...
s and considered intermediate in
morphology.
References
{{Taxonbar, from=Q33137448
Craniata
Prehistoric brachiopods