Talk:Cnidaria

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These two paragraphs seem to lack continuity, and redefine the stinging cells from cnidocysts to nematocysts. Other literature e.g. the tree of life page states that nematocysts are one kind of cnidae, albeit the commonest (the term cnidocsyst is widely used as well).

Cnidarians lack organs, but have various differentiated tissues. Their movement is coordinated by a decentralized nerve net and simple receptors. Respiration takes place by diffusion of oxygen directly through their tissues, without specialized structures like gills, tracheae or lungs, made possible by their small or flattened bodies. Tentacles surrounding the mouth contain cnidocysts, specialized stinging cells. The ability to sting is what gives cnidarians their name (Greek knide, nettle).
Cnidarians use special means in capturing their prey. They use nematocysts which are stinging cells that are used to render their prey unable to defend themselves. The nematocysts are the Cnidarians main form of defense. Cnidarians administer the stinging cells when they are able to sense chemically or physically the presence of another entity. Dead or paralyzed prey are pushed into the cnidarian's mouth by the tentacles. Digestion occurs in the gastrovascular cavity, and any undigested food exits the body via the mouth.

joe 20:54, 20 Jul 2004 (UTC)

Contents

[edit] Pronounciation

I think it should include how you pronounce the name as i have no idea (is it a silent c?). Also the first line at the start where it says how the name is derived makes no sense.

[edit] This article needs to be improved

I'll add the template later--IAMTHEEGGMAN (talk) 00:17, 12 February 2006 (UTC)

well, alternation of generation refers to diploid/haploid cycle, not sexual/asexual. Cnidarians do NOT experience alternation of generation because they're diploid throughout the life cycles except for in gametes. (21 June 2006)

[edit] Classification - Cnidaria



                     Phylum: Cnidaria (once Coelenterata)
                           Class: Cyclozoa †
                        Subphylum: Anthozoa
                        Subphylum: Medusozoa


I would eliminate these, as these are duplicated in other articles

[edit] {Expert} template added

This article is simply too short and simple. Compare it to Ctenophore. Twilight Realm 05:49, 24 April 2006 (UTC)

I'm going to begin a translation from the German soon, as I did on Ctenophore. I've removed the expert tag for the moment so we don't get any duplicated effort. --Sam Blanning(talk) 12:38, 27 April 2006 (UTC)

Done. I've not had to merge a translation with such a large amount of already-existing text before, so apologies if I've omitted something important or moved it somewhere it shouldn't be. User:Samuel Blanning/Cnidaria contains the English article as it was when I started and my translation of the German article in case it helps anyone who wants to try a better merge. --Sam Blanning(talk) 21:58, 8 May 2006 (UTC)

I've deleted that subpage as it's been almost a month - if anyone wants the original text of my translation pre-merge, bell me. --Sam Blanning(talk) 23:16, 4 June 2006 (UTC)


FYI this weeks Science journal spells it Cnideria not Cnidaria.... translation issue?

(29 Sept 06 vol 313 issue 5795)

I see the confusion...the phyla is Cnideria, but they are collectively referred to as Cnidarians.

For what it's worth, Google gets 674 hits for 'Cnideria' and 671,000 for 'Cnidaria', and when restricted to www.sciencemag.org, gives 3 hits for 'Cnideria' (all for the same article) and 100 hits for 'Cnidaria'. It appears that Science almost always uses 'Cnidaria'. I'm tempted to speculate that 'Cnideria' is a typo in a single article. -- Donald Albury 00:38, 17 October 2006 (UTC)


actually 2 articles back to back in science 313 issue 5797 say cnderia not cnedaria.....sorry i'm not a professional scientist but Science journalnal is kind of my gold standard....... if they say it i'm not going to argue.

And 72 previous articles that spell it 'cnidaria' don't count? Besides which, any claim that 'cnideria' is a recognized spellng based on it's occurrence in one or two articles amounts to original reasearch, and thus is not allowed in a WP article. -- Donald Albury 02:34, 18 October 2006 (UTC)
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