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Pelagia noctiluca nematocysts

 
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Pau
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Joined: 20 Jan 2010
Posts: 4436
Location: Valencia, Spain

PostPosted: Fri Dec 29, 2017 4:43 am    Post subject: Pelagia noctiluca nematocysts Reply with quote

Pelagia noctiluca is a very common bitting jellyfish. Not very dangerous but really painful. Often its blooms arrive to the western Mediterranean sea beaches ruining the bath.

I captured one and after a two hours travel to home it survived but feeling less active. Next day it was almost disintegrated, the jar was a mess of gelatinous parts. Drops of it showed lots of nematocysts of two (three?) types, bot fired and unfired.

Sorry for the mess in the pictures, they don't look very nice but I think the subject is interesting enough for posting.
All done with a NPL Fluotar 40/0.70 with DIC

Stack, pretty difficult to do because movements at the sample and high contrast at the main subject. B&W converted


Single shot


The big nematocysts filaments are really long. I was unable to take a decent picture of the tip
[/i]
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ChrisR
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Joined: 14 Mar 2009
Posts: 7789
Location: Near London, UK

PostPosted: Fri Dec 29, 2017 8:37 am    Post subject: Reply with quote

Fascinating!!
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JH



Joined: 09 Mar 2013
Posts: 1134
Location: Vallentuna, Stockholm, Sweden

PostPosted: Fri Dec 29, 2017 10:48 am    Post subject: Reply with quote

Thanks!
Very interesting.
Best regards
Jörgen Hellberg
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carlos.uruguay



Joined: 23 Feb 2012
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Location: Uruguay - Montevideo - America del Sur

PostPosted: Sat Dec 30, 2017 6:36 am    Post subject: Reply with quote

Very interesting!
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CEN



Joined: 23 Aug 2016
Posts: 149
Location: Southern Germany

PostPosted: Sat Dec 30, 2017 2:11 pm    Post subject: Reply with quote

Ok, it is an European jellyfish.

Once I met a jellyfish in Brasil. They called it just "Agua viva". The Boy at the beach told me that I "pode matar" with this jellyfish. I guess it was a "Caravela" (Physalia physalis). It was a lot of pain thus I first thought I was hit by a stingray......

Feliz ano novo

Christian
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Pau
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Joined: 20 Jan 2010
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Location: Valencia, Spain

PostPosted: Sat Dec 30, 2017 4:17 pm    Post subject: Reply with quote

Pelagia nocitluca is not only European, it's an almost cosmopolitan specie.

Physalia, not a true medusa but a colony, is really dangerous, sometimes deadly. Fortunately it doesn't live at the Mediterranean although sometimes it arrives to the sud west from the Atlantic. I've seen it several times at Canary Islands and Portugal, never had the honor to meet it so directly.
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CEN



Joined: 23 Aug 2016
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Location: Southern Germany

PostPosted: Sat Dec 30, 2017 4:57 pm    Post subject: Reply with quote

A year after my close encounter with an atlantic jellyfish, I saw hundreds or thousands of Physalia arriving at a beach in Bahia / Brasil and the people step on the alluvials to burst their airbags.

Nobody cares, not even the "Lifeguard"..........

I refused there to take any step into the water....

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Christian
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KurtM



Joined: 16 Jul 2014
Posts: 62
Location: League City, Texas

PostPosted: Tue Jan 02, 2018 7:59 pm    Post subject: Reply with quote

Fantastic! As a sea kayak instructor I have been stung by jellyfish more times than I can count -- very fascinating to see the mechanism of delivery!
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Kurt Maurer
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