New Ukrainian Fauna species <i>Polydora websteri</i> (Hartman, 1943) (Polychaeta: Spionidae) from the coastal waters of Crimea (Black Sea)
In the shells of the oyster <i>Crassostrea gigas</i>, cultured in marifarms of the south-western and the southern Crimea, discovered a new species for the fauna of Ukraine bristle worm <i>Polydora websteri</i>. The oysters were contaminated borer polychaetes, from the first year of life. The occurrence reached 29 %. This species of Polydora found in the limestone rocks in the area of Sevastopol too. The larvae developed in the capsules to the stage of 12 - 13 segments, eating nurse eggs, the number of which was 85 - 90 % of the total number of eggs in the capsules.