Talk:Hydra (genus)

Noting my previous comments above, I would propose that we retain Hydra as the singular and use Hydribus as the 3rd declension ablative plural of a Greek noun in Latin . If we can't make a case for the ablative (by with or from Hydras) and have to stick to the boring Nominative case, then I am afraid we are stuck with Hydra again as the plural and unremarkably Hydra as the singular too. Ho hum.  Velella  ^{Velella Talk}   22:56, 4 February 2013 (UTC)[reply]

The schematic drawing of the nematocyst is incorrect for the following reason: When triggered, the content of the cell is everted (like blowing the fingers out of an inverted rubber glove). The barbs that are shown to shoot out in the third part of the drawing should remain stationary, while the thread everts through the barbs. —Preceding unsigned comment added by 94.224.135.45 (talk) 18:32, 18 October 2009 (UTC)[reply]

I removed the following paragraph from the Morphallaxis section, because I have searched for hours, but I have not been able to find a single reliable source for the claims made therein. At the end, I added some claims from other sources that sported claims not noted in this article, but which stated that their source was this Wikipedia article. The actual text I removed is in bold print (to include the text within the Citation needed template that is colored green):

Nineteenth-century biologists reported that the Hydra was such a simple animal that it was possible to force one through gauze to separate it into individual cells; if the cells were then left to themselves, they would regroup to form a hydra again. This experiment has not been repeated successfully in the 20th or 21st centuries;{{Citation needed|reason= www.ias.ac.in/jarch/jbiosci/17/95-114.pdf : "The experiments of H V Wilson in the early part of this century seemed at first to suggest that contrary to any evidence for embryonic mosaicism, adult sponges were highly regulative. What Wilson (1911) did was to press a marine sponge through bolting cloth (a fine, stiff gauze sieve) and by doing so he separated the cells and the individual cells would settle on the bottom of a dish of sea water. If they were kept properly aerated, in a matter of few days, they re-formed new, small sponges. The rubble of cells reconstituted a new individual. Wilson interpreted these experiments as an example of regulation, where the separation made all the cells return to an embryonic condition and once the motile cells accumulated in balls, the cells on the outside re-differentiated into epithelial cells, while those in the interior turned into collar cells and amoebocytes.", "Besides their ability to regulate, hydroids also show evidence of cell migration and sorting out very similar to that found in sponges. If a hydroid is macerated with a small scalpel and reduced to a pile of mixed cells, it will recover and produce an individual polyp. (Hydroid tissue cannot be put through bolting cloth—the cells are too tightly cemented together). This reconstituted polyp is presumed (but not known) to be produced by the cells retaining their original fate and simply reorganizing, as we saw to be the case in sponges." |date=January 2011}} the remains of the hydra do not reform - all that is produced is "hydra soup". A similar experiment with sponges has been more successful; however, the cells produced will grow into new sponges instead of regrouping to form the original individual.

That text should remain on this talk page and not reintroduced to the article until a reliable source(s) can be found.– Paine (Climax!)  03:29, 8 November 2012 (UTC)[reply]

Quote: "The controversial unlimited life span of Hydra has attracted the attention of natural scientists for a long time."

So, it seems there's a controversy about the senescence of the hydra. I found nothing about it neither in the article nor elsewhere on the net. Can somebody tell more about that controversy? And if there is a controversy, I don't understand why the article takes an one sided position stating adamantly immortality, only immortality, nothing else but immortality.

And, by the way, I saw on the net a careless confusion between very long age and immortality. I don't understand why that difference is minimalized or even ignored. It's of a huge importance.Srelu (talk) 02:35, 9 April 2016 (UTC)[reply]

What you found and didn't find while doing your do diligent research appears to answer your question: the article content can only include what already exists in published, reliable, and hopefully secondary sources. Anything else would be original research. Which, it would also appear, may already be in the article anyway, since the article mentions controversy that apparently can't be verified to be discussed in any other place but here..

Cheers Firejuggler86 (talk) 05:55, 30 April 2020 (UTC)[reply]

And the "life cycle" section doesn't explain anything about hydra death. Do they die of old age? Or do they die only due to external factors like starvation, dehydration, poisoning, being eaten, etc.? ~

talk) 01:35, 25 July 2016 (UTC)[reply

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Most Hydra in temperate climates die at the onset of winter, probably through starvation, but leave behind the sexually produced resting eggs which hatch in the spring.  Velella  ^{Velella Talk}   09:10, 25 July 2016 (UTC)[reply]

Schematic drawing of a discharging nematocyst / add size info, this is an encyclopedia, it is VERY important to mention the size!!! — Preceding unsigned comment added by 2A02:587:410F:8100:7006:1E3A:DCA4:BE2C (talk) 13:58, 14 June 2016 (UTC)[reply]

How about at Cnidocyte where there is a diagram and an electron micrograph showing the size under magnification?  Velella  ^{Velella Talk}   19:56, 16 June 2016 (UTC)[reply]

I have added three additional sentences to this section, however, I feel that more should be described on the regenerative abilities of Hydras.--Mhedelund2017 (talk) 00:25, 28 January 2019 (UTC)[reply]

This is the page I am working on for my Development Biology Spring 2019 course. Mhedelund2017 (talk) 21:26, 31 January 2019 (UTC)[reply]

Iam a 51 year old women. Something which I believe could be a hydra has infested my hair, gums, my digestive system. I cant get any help from doctors at the va loma Linda,ca. With all Seriousness this is not a Joke and I need Help. Something is seriously wrong. I've been dealing with this for 5 years and it taken it destroying me it a viscous 3bweek cycle that I've endured month after month to years Alway the same I dobt know how I've lasted this long . If anyone can direct this to anyone who can save me please do 2603:8001:4800:B6:C1E8:D8D0:45C0:25E3 (talk) 08:57, 8 December 2021 (UTC)[reply]

Sorry, but Wikipedia never offers medical advice. For the record Hydras only live underwater.  Velella  ^{Velella Talk}   09:06, 8 December 2021 (UTC)[reply]

Hydra definition,sponges cporifera,habitat and nutrition 41.191.107.218 (talk) 23:40, 8 February 2022 (UTC)[reply]

I don't understand. If you are suggesting sections this article is missing yes Definition is only briefly given in the introduction and could be expanded; no sponges/cPorifera are a different taxon; Habitation and Nutrition could be added here if there are common characteristics among Hydra. Invasive Spices (talk) 9 February 2022 (UTC)