Article: Amphipora and Euryamphipora (Stromatoporoidea) from the Devonian of western Canada

Subsurface diamond cores of the Devonian Swan Hills Formation of central Alberta contain well-preserved specimens of Amphipora Schulz and Euryamphipora Klovan. Three varieties of Amphipora are recognized in the Swan Hills material, and are referred to the species A. angusta, A. pervesiculata, and A. ramosa; a new species of Euryamphipora (E. mollis) and the type species E. platyformis also are present. Amphipora is placed in the Clathrodictyidae with Euryamphipora since they have identical tissue. 'Juvenile' forms, which may represent an early astogenetic stage, are found associated with mature Amphipora coenostea. The concept that some forms of Amphipora grew without producing a peripheral rim is rejected and the absence of this feature s considered the result of abrasion.