Beyrichonidae Ulrich and Bassler, 1931

Álvarez, María Eugenia Dies, Gozalo, Rodolfo, Cederström, Peter & Ahlberg, Per, 2008, Bradoriid arthropods from the lower-middle Cambrian of Scania, Sweden, Acta Palaeontologica Polonica 53 (4), pp. 647-656 : 650

Family Beyrichonidae Ulrich and Bassler, 1931 Genus Beyrichona Matthew, 1886

Type species: Beyrichona papilio Matthew, 1886 , from the lower Cambrian Hanford Brook Formation, Protolenus elegans Zone , in New Brunswick, Canada; designated by Ulrich and Bassler (1931: 43).

Remarks.—The concept of Beyrichona was discussed by Siveter and Williams (1997) and Williams and Siveter (1998), and their emended diagnosis is followed herein. Beyrichona gevalensis Wiman, 1905 and B.? alta Wiman, 1905 , both from erratic sandstone boulders in the southern part of the Gulf of Bothnia, Sweden, were questionably considered as junior synonyms of B. tinea by Siveter and Williams (1997). The new record of B. tinea in the Gislöv Formation of Scania confirms the presence of the genus in the upper lower Cambrian of Scandinavia.

Stratigraphic and geographic distribution.—Lower Cambrian of New Brunswick and middle Cambrian of Nova Scotia, Canada ( Siveter and Williams 1997); middle Cambrian St David’s Series and early Ordovician Tremadoc Stage of southern Britain ( Williams and Siveter 1998); Furongian Series? of Belarus and middle Cambrian and Furongian Series of Kazakhstan ( Melnikova et al. 1997); lower Cambrian of Scandinavia (Scania and possibly the Gulf of Bothnia).