Oncosphere

The first larva of the real tapeworms ( Eucestoda ) is called the hook larva or oncosphere ("hook ball" ). It develops as a waiting stage in mature eggs and by six so-called Embryonalhaken - in why they as - hook-shaped extensions at the head of six hook larva is called (Hexacanthlarve). The metacestode develops from it after it has been taken up by an intermediate host . In the Diphyllobothriidae , the oncosphere is called Coracidium . This swims freely in the water as a ciliated larva and develops into a procercoid in the first intermediate host .

literature

• Thomas Schnieder (Ed.): Veterinary Parasitology. 6th completely revised and expanded edition. Paul Parey, Stuttgart 2006. ISBN 3-8304-4135-5 .
• Johannes Eckert: textbook of parasitology for veterinary medicine . Georg Thieme Verlag, 2008, ISBN 9783830410720 , p. 188.