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Physalia

physalia

(Science: zoology) A genus of large oceanic siphonophora which includes the portuguese man-of-war.

It has a large air sac, or float, with a sail-like crest on its upper side. Numerous zooids of different kinds are attached to the under side of the float. Some of the zooids have very long tentacles; some have a mouth and digest food; others produce gonophores. The American species (Physalia arethusa) is brilliantly coloured, the float being pink or purple, and bright blue; the zooids blue. It is noted for its virulent stinging powers, as well as for its beautiful colours, graceful motions, and its ability to sail to windward.

Origin: NL, fr. Gr. A bladder, fr. A bellows.


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Re: siphonophores

Hi Julia! You're right biology is awesome! There are roughly 200 spp of Siphonophore the species you mention is Physalia physalis which is the only species that floats, the vast majority swim underwater. 1) The initial zooid arises from a fertilised egg, the rest of the colony ...

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by fumpledrumpskin
Sun Sep 15, 2013 3:08 pm
 
Forum: Zoology Discussion
Topic: siphonophores
Replies: 2
Views: 2085

WHAT IS THIS??

Yes, I think it belongs to jellyfish group. It reminds me of Man-of-war Physalia pelagica

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by Dr.Stein
Thu Oct 05, 2006 6:05 am
 
Forum: Zoology Discussion
Topic: WHAT IS THIS??
Replies: 7
Views: 3475

examples from phylum

... up spelling though for scientific names Porifera: sponges - my fav the glass sponges Hexactinellida Cnidaria: Jelly fish - Portuguese Man-of-War (Physalia physalis) Platyhelminthes: flatworms - A Parasitic worms of the class Amphilinida (Amphilina foliacea) Annelida: worms – earthworms (Lumbricus ...

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by Carolynparsons
Mon Nov 28, 2005 2:26 pm
 
Forum: General Discussion
Topic: Definitions
Replies: 4
Views: 2820


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