Wildlife Gardeners - North American Wildlife Gardening  

Go Back   Wildlife Gardeners - North American Wildlife Gardening > Wildlife Gardeners of North America Unite > Aquatic Animals

Reply
 
LinkBack Thread Tools Display Modes
Old 04-05-2010, 05:00 PM   #1
WG Staff
 
Staff's Avatar
 
Join Date: Nov 2008
Default Know your jellyfish

Know your jellyfish:
some sting, some don't
by Dr J Floor Anthoni

Know your jellyfish
excerpt from above:
Quote:
All cnidaria have stinging cells (cnidocytes), capable of inflicting rashes, stings or even burns. The animals can make these amazing cells at such rate that they can be used as dispensible tools. They can have different types, for stinging, sticking and gripping. The one shown in the diagram is of most concern to us since it is what causes the feared sting. The skin of a jellyfish tentacle is studded with these stinging cells. Each has a trigger hair (cnidocil) that activates a nerve circuit to unlatch the lid (operculum) and at the same time compress the cell. Several adjacent cells can be triggered simultaneously. Inside the capsule, the harpoon and its stinging thread (nematocyst) are ejected under pressure. The barbed harpoon is filled with poisons and everts itself like turning a finger of a rubber glove inside out, punching a hole in one's skin, releasing the poisons and pushing the thread into the punctured skin, to release even more poison. Once used, a stinging cell is discarded and replaced within two days. It is so amazing that such a complicated double-walled structure is made by a single cell!
__________________
The tendency of man's nature to good is like the tendency of water to flow downwards.
-Mencius
Staff is offline   Reply With Quote
Old 04-18-2010, 11:39 PM   #2
Official Plant Nerd
 
Equilibrium's Avatar
 
Join Date: Dec 2008
Default

Forgive me.... I can't resist. It's a photo from my email that dropped my jaw to the desk.
Attached Thumbnails
Know your jellyfish-forreal.jpg  
__________________
"Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind."
- Dr. Seuss
Equilibrium is offline   Reply With Quote
Old 04-19-2010, 08:59 AM   #3
The Bug Whisperer
 
suunto's Avatar
 
Join Date: Dec 2008
Location: Monroe County, WV, USA
Default

Quote:
Originally Posted by Equilibrium View Post
Forgive me.... I can't resist. It's a photo from my email that dropped my jaw to the desk.
This appears to be a composite image. The largest known jellyfish has a maximum bell diameter of a little more than seven feet - see Lion's mane jellyfish - Wikipedia, the free encyclopedia
__________________
“Every artist dips his brush in his own soul and paints his own nature into his pictures.”

Henry Ward Beecher
suunto is offline   Reply With Quote
Old 04-22-2010, 12:13 AM   #4
Official Plant Nerd
 
Equilibrium's Avatar
 
Join Date: Dec 2008
Default

It's a hoax!!! Bummer. I thought I had a really special new invasive species from an e-mail. The fake photo is impressive. I take it somebody photo shopped it somehow?
__________________
"Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind."
- Dr. Seuss
Equilibrium is offline   Reply With Quote
Old 04-23-2010, 01:00 PM   #5
Unicellular Fungi
 
TheLorax's Avatar
 
Join Date: Nov 2008
Default

My dear Lib, I believe you were had.
Giant Jellyfish
Giant Jellyfish Optical Illusion | Mighty Optical Illusions
Giant Jellyfish on Flickr - Photo Sharing!
__________________
"In the end we will conserve only what we love; we will love only what we understand; we will understand only what we have been taught."
-Baba Dioum, Senegalese ecologist
TheLorax is offline   Reply With Quote
Old 04-24-2010, 12:19 AM   #6
Official Plant Nerd
 
Equilibrium's Avatar
 
Join Date: Dec 2008
Default

It's not the first time.... it won't be the last.
__________________
"Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind."
- Dr. Seuss
Equilibrium is offline   Reply With Quote
Old 04-25-2010, 05:46 PM   #7
Heron
 
jpdenk's Avatar
 
Join Date: Aug 2009
Location: Tinley Park, Illinois, USA
Default

Quote:
Originally Posted by Equilibrium View Post
It's a hoax!!! Bummer. I thought I had a really special new invasive species from an e-mail. The fake photo is impressive. I take it somebody photo shopped it somehow?
Yep, actually a fairly easy one to Photoshop.
__________________
Click here for an album of some of my nature photos.
jpdenk is offline   Reply With Quote
Old 04-26-2010, 08:58 AM   #8
WG Staff
 
Staff's Avatar
 
Join Date: Nov 2008
Default Giant deep sea jellyfish filmed in Gulf of Mexico

Giant deep sea jellyfish filmed in Gulf of Mexico
By Jody Bourton
Earth News reporter
Page last updated at 11:35 GMT, Friday, 23 April 2010 12:35 UK

BBC - Earth News - Giant deep sea jellyfish filmed in Gulf of Mexico
excerpt from above:
Quote:
Remarkable footage of a rarely seen giant deep sea jellyfish has been recorded by scientists.

Using a remotely operated vehicle (ROV), they captured a video of the huge Stygiomedusa gigantea...
__________________
The tendency of man's nature to good is like the tendency of water to flow downwards.
-Mencius
Staff is offline   Reply With Quote
Reply

Tags
aquatic species, bbc, cnidaria, cnidocytes, deep sea jellyfish, earth news, giant jellyfish, gigantea, gulf of mexico, jellyfish, jellyfish species, lion's mane jellyfish, nematocyst, ocean, ocean life, ocean wildlife, oceans, sea life, sting, stinging cells, stings, stygiomedusa, stygiomedusa gigantea, tentacles

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 01:52 PM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.3.2