Late Devonian stromatoporoid from the Sudetes Mountains (Poland), and endemicity of the Upper Famennian to Uppermost Famennian (=“Strunian”) stromatoporoid fauna in western EuropeUn stromatopore du Dévonien supérieur des Monts Sudètes (Pologne) et l’endémisme de stromatopores du Famennien supérieur à Famennien terminal (= «Strunien») d’Europe occidentaleEine oberdevonische Stromatopore aus den Sudeten (Polen) und der Endemismus der Stromatoporen-Fauna im oberen Famennium bis obersten Famennium (= „Strunium“) Famennium von West-Europa

A single large stromatoporoid specimen collected by one of us (D. W.) from the so called “Main Limestone” at Dzikowiec (= Ebersdorf) in the Sudetes Mountains of Lower Silesia, Poland, is here assigned toTrupetostromaParks 1936. It is typical of the Upper Famennian to Uppermost Famennian (= “Strunian”) stromatoporoid Assemblage no. 3 defined byStearn (1987) andStearn, Halim-Dihardja & Nishida (1987). This assemblage, confined to western Europe and Kazakhstan, is dominated by clathrodictyids but without labechiids. Other genera present together withTrupetostroma in this assemblage includeAmphipora, Anostylostroma, Atelodictyon, Clathrocoilona, Clathrodictyon, Clathrostroma, Gerronostroma, Petridiostroma andStromatopora. All those genera were widespread globally through the Middle and Upper Devonian (Givetian-Frasnian), but in the the Upper Famennian to Uppermost Famennian (= “Strunian”) deposits of western Europe they appear as typical “Lazarus taxa” — a consequence of the Frasnian/Famennian boundary Kellwasser Event which terminated reefal environments worldwide. Viewed at the generic level, the western European the Upper Famennian to Uppermost Famennian (= “Strunian”) stromatoporoid fauna is essentially ubiquitous, but at the species level endemism is pronounced. This may have resulted from reactivation of disjunct biotopes when conditions became conducive, locally, to renewed reefal development. This endemicity is analysed using the Jaccard Coefficient.