†family Pycnolithidae Lindström 1899 (tabulate coral)

Anthozoa - Heliolitida - Pycnolithidae

Parent taxon: Coccoseridicae according to D. Hill 1981

Sister taxa: Coccoserididae, Ellisitidae, Palaeoporitidae, Pragnellia, Urceopora

Subtaxa: Pycnolithus

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Ecology: stationary epifaunal suspension feeder-photosymbiotic

Distribution:

• Silurian of Canada (1: Quebec collection)

• Ordovician of Australia (2), United States (3: Alaska)

Total: 6 collections each including a single occurrence

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