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PletwyRyb.svg pl Typy petw ogonowych ryb heterocerkalna protocerkalna homocerkalna dyficerkalna de Schwanzflossentypen Heterocerk Protocerk Homocerk Diphycerk en types of caudal fin Heterocercal Protocercal Homocercal Diphycercal it tipi di pinne caudali Eterocerca Protocerca Omocerca Dificerca fr Types de nageoires