Genus Byronia Matthew, 1899
Type species: Byronia annulata Matthew, 1899
Class Scyphozoa, Subclass Scyphomedusae, Order: ?Coronata, Incertae familiae
According to Mierzejewski (1986), the generic name Byronia
Matthew should be treated as a name for informal
collective group for all the fossil solitary species of
scyphopolyps as well as those forming encrusting colonies.
Similarly, in zoological practice, the name Stephanoscyphus
is used for both colonial and individual forms. Naumov (1961)
was of the opinion that the species at present described
under the name Stephanoscyphus will undoubtedly be
allocated to a few separate families in the future.
Mierzejewski (1986) supposed that each of the species of
Byronia listed by him should be allocated in a separate genus
but there is no way of verifying that assumpion. In turn,
dendroidal forms such as so-called dithecoid graptolites
(Dithecoidea) of Sdzuy (1974) should be allocated in the
genus Archaeolafoea Chapman, and also treated as a informal
collective group.
Diagnosis of the genus Byronia by Mierzejewski (1986, p. 145):

"Scyphothecae long, circular to suboval in cross-section,
gradually widening in distal direction. Scyphorhiza in the
form of basal disc; colonial forms also with stolons.
Periderm organic, sculptured with transversal rings,
longitudinal striated or smooth. Solitary and encrusting
forms."
Byronia annulata Matthew, 1889
Holotype, Upper Cambrian, Mount Stephen (British Columbia).
References:

Kozłowski, R. 1967. Sur certains fossiles a test organique. - Acta Paleontologia
Polonica12, 2, 99-132.

Matthew, G. F. 1899. Upper Cambrian of Mount Stephen, British Columbia:
the trilobites and worms. - Roy. Soc. Canada, Trans., Ser. 2, 5, 4, 39-56,
Ottawa.

Mierzejewski, P. 1986. Ultrastructure, taxonomy and affinities of some
Ordovician and Silurian organic microfossils. - Palaeontologia Polonica 47,
129-220.