†family Sphaeragnostidae Kobayashi 1939 (artiopod)

Artiopoda - Agnostida - Sphaeragnostidae

Parent taxon: Agnostida according to H. B. Whittington et al. 1997

Sister taxa: Agnostina, Ceragnostus, Eodiscina, Formagnostus, Glyptagnostidae, Lavsanodiscus, Pleurinodus, Quadrahomagnostinae

Subtaxa: Sphaeragnostus

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Ecology: slow-moving epifaunal detritivore

Distribution:

• Dobrotivian of Czechia (1 collection)

• Ordovician of Canada (2: Quebec), China (7), Czechia (1), Denmark (1), Poland (1), Sweden (3), the United Kingdom (3), United States (1: Maine)

Total: 20 collections each including a single occurrence

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