While washing some Mucrospirifer fossils that I'd found at Arkona I noticed a few had some of the Bryozoan Hederella that had grown on them. I have not found many brachiopod specimens with this association at Arkona, usually it's only on Horn corals.
A plate of Mucrospirifer but only one has Hederella growing on it.
A loose Mucrospirifer specimen has some growths too.
Another piece of a shell with some Hederella growths on it.
The Mucrospirifer fossils came from the Widder formation while the partial shell fossil came from the Hungry Hollow member. Both are Devonian, Givetian stage, in age.