Placophylliidae Eliášová, 1990

Baron-Szabo, Rosemarie Christine, Tschanz, Karl & KÜrsteiner, Peter, 2022, Scleractinian corals from the Lower Cretaceous of the Alpstein area (Anthozoa; Vitznau Marl; lower Valanginian) and a preliminary comparison with contemporaneous coral assemblages, Swiss Journal of Palaeontology (3) 141 (1), pp. 1-61 : 24

Family Placophylliidae Eliášová, 1990 Genus Placophyllia d’Orbigny, 1849

Type species. Lithodendron dianthus Goldfuss, 1827 , Upper Jurassic of Germany (Giengen) .

Diagnosis. Colonial, mainly phaceloid, can be subdendroid or fasciculate with plocoid to cerioid polyp outlines in younger colonies. Budding extracalicular and intracalicular-marginal. Costosepta compact, septal flanks covered by small granules. Distal edge of septa smooth. In closely packed corallites costae may be subconfluent. Columella lamellar. Synapticulae and pali absent. Intertrabecular distance ranging between 40 and 130 µm in septa. Corallite wall parathecal, irregular. Septothecal thickenings present or absent. Endothecal dissepiments vesicular in peripheral corallite areas and subtabulate in axial corallite areas. Epithecal sensu lato wall folded.