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Genus Byronia Matthew, 1899 
Type species: Byronia annulata Matthew, 1899
by Countess Maja Anna Korwin-Kossakowska
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Class Scyphozoa, Subclass Scyphomedusae, Order: ?Coronata, Incertae familiae
Edited by
Zakład Paleobiologii - Goethe Lab
Warszawa, 2004
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See also related pages:
Byronia naumovi Kozłowski, 1967
Byronia robusta (Kozłowski, 1967) Mierzejewski, 1986
Dithecoidea - a taxonomic wastebasket.
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.