Pseudophyllidea
| Pseudophyllidea | ||||||||||
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| Scientific name | ||||||||||
| Pseudophyllidea | ||||||||||
| Carus , 1863 |
Pseudophyllidea is an order of tapeworms that parasitize on various vertebrates and the most famous representative of which is the fish tapeworm . A development cycle with two intermediate hosts is typical, the first always being a small cancer .
features
The scolex of the Pseudophyllidea is variable in design, but always has two longitudinal pits, which, however, do not represent real suction pits ( bothria ), which is the name given. The tapeworm limbs ( proglottids ) are wider than they are long, the sex openings (genital pores) are in the middle of the underside. The yolkstock system ( vitellarium ) has a double design and, with the testicles , takes up the space next to the ovary and uterus. The uterine pore opens separately, close to the genital pores. The gravid uterus is a long tube filled with eggs that is placed in loops in the middle of the limb between the ovary and the genital pore. The covered eggs are not embryonated when they are released.
Systematics
The Pseudophyllidea are divided into seven families. However, the taxonomic unit has recently been questioned and its replacement by two orders (Bothriocephalidea and Diphyllobothridea) has been proposed.
Individual evidence
- ↑ a b c Winfried Ahne: Zoology: textbook for students of veterinary medicine and agricultural sciences . Schattauer Verlag, 2000, ISBN 9783794517640 , p. 207.
- ↑ Oliver Wilford Olsen: Animal Parasites: Their Life Cycles and Ecology . Courier Dover Publications, 1974, ISBN 9780486651262 , p. 332.
- ^ Alan Gunn, Sarah Jane Pitt: Parasitology: An Integrated Approach . John Wiley & Sons, 2012, ISBN 9780470684245 , p. 103.
