Petasidae
| Petasidae | ||||||||||
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| Scientific name | ||||||||||
| Petasidae | ||||||||||
| Haeckel , 1879 |
The Petasidae are a family of jellyfish from the order of trachymedusae .
features
The Petasidae have four radial canals and neither stalk nor centripetal canals. There is a sack-shaped gonad on each radial canal .
At the edge sit ungrouped firm tentacles, which at their end, clump-shaped, carry a group of cnidocysts . The club-shaped sense organs ( statocysts ) are free.
Systematics
The family contains two genera, each with a valid species, Petasus also contains two dubious species (according to Bouillon et al. (2006)).
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Petasiella Uchida, 1947 (invalid; preoccupied by Petasiella Gude & Woodward, 1921, Mollusca)
- " Petasiella " asymmetrica Uchida, 1947
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Petasus Haeckel, 1879
- Petasus atavus Haeckel, 1879
- Petasus digonimus (Haeckel, 1879) ( noun dubium )
- Petasus tiaropsis (Haeckel, 1879) ( noun dubium )
swell
- Jean Bouillon, Ferdinando Boero: Synopsis of the families and genera of the Hydromedusae of the world, with a list of the worldwide species , in: Thalassia Salentina, Vol. 24, 2000, p. 67, PDF
- PL Kramp: Synopsis of the Medusae of the World. , in: Journal of the Marine Biological Association of the United Kingdom, 1961, Vol. 40, p. 243, PDF Online