A new myxosporean species, Trilosporoides platessae gen. et sp. n. (Multivalvulida), is described from the gallbladder of the plaice Pleuronectes platessa L. (Pleuronectidae) from Denmark. The myxospore of T. platessae is conical in side view, with a 24 µm long, pointed posterior projection. In apical view, the myxospore (diameter 9.4 µm) is round, trilobed and with three spherical polar capsules arranged peripherally, equidistant and opening peripherally through protruding tips. The polar capsules are of different sizes, one often larger than the others (diameter 3.3 µm vs. 2.5 µm). Apart from the long posterior projection, the myxospore of T. platessae differs from those of the three known species of Trilospora Noble, 1959 and from all genera within the order Multivalvulida Shulman, 1959 in the arrangement of the polar capsules. Trilosporoides platessae may temporarily be placed in the vicinity of the Trilosporidae.
Třinecké odkaliště poskytuje obraz sukcesních změn, kdy se mezi pionýrskými druhy vyskytují i vzácní a chránění živočichové a rostliny a z tohoto hlediska bude zajímavé sledovat vývoj společenstev na této lokalitě i nadále. and The settling pit in Třinec can serve as a model of succession changes, during which rare and protected animals and plants also appear among pioneer species. Therefore the further development of communities at this site is worth monitoring.