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Yes, the picture was removed, we'll have to find one not protected by copyright. With the lifespan indicated by the book, this if for freshwater aquatic snails, not land snails. Marine gastropods live considerably shorter than land ones. When you say 'numerous other errors' can you give some examples? By the way, once again, this is a refferal to LAND snails, I'll fix the title to indicate that. And I think you'll find that the words feelers and tentacles are synonymous in this case. If anything, feelers might be preffered as the term tentacles might make someone think of octopus/squid/nautilus/etc appendages. That's an interesting suggestion you have raised on parasites, I'm more of an expert on behaviour than this sort of thing. If anyone can find the information, I encourage them to write a section on it. --User:Crazy drunk hobo
How many species?
How many families, genera, species?
http://everything2.com/index.pl?node_id=49253 is interesting, and includes some information that's not here.
The author, "Tem42", says: 
All my factual WUs are copyleft. Or copyless, anyway. I would like someone more motivated than I to port them to www.wikipedia.org
So there you go.
I get that the word "snail" often refers to land snails (tho no ref is provided for this), and that it can also refer to sea snails and apparently some other groups like the Monoplacophora (really?). However, none of the first four paragraphs of our current "Snail" article has any sources/ references. The current article on sea snails makes clear that that term lacks specificity (and also states several things about sea snails that appear to be just as true for land snails, making me wonder why we have separate articles if living in saltwater vs. freshwater is about as useful as having separate articles on tree-dwelling mammals and land-dwelling mammals when this is is not a meaningful distinction). @Invertzoo: - the "snail lady", and @JonRichfield:. If anyone else can offer some insights, I would be glad to see them. Jon and I took care of cobras a bit ago, and Invert and I have sorted out scallop, both of which might be helpful (?) to refer to. The lead to this article should be able to state what a "snail" is and meaningfully distinguish it from the related topics/ articles on the gastropods, sea snails, land snails, slugs, sea slugs, semi-slugs (there is currently no article on freshwater slugs, and land slugs redirects to slug), etc. and do it without resorting to dictionary definitions like "the word 'snail' can refer to..." (all I am hoping for at the moment is some justification for the current situation, which still feels more than a bit wrong to me.). KDS4444 (talk) 09:33, 15 April 2017 (UTC)
- Good luck finding sources for this kind of thing and good luck trying to make sense of it all. Gastropod is of course a scientific term, whereas snail and slug are loose common names. Snail is basically a gastropod which has a shell, and slug is basically a gastropod which has no shell, but they are of course very imprecise common names. Some slugs have internal shells or even small external shells. And... the word slug has been applied to things such as sea cucumbers, which aren't even mollusks!
- The freshwater snails are certainly different families altogether from the land snails, which are in turn different families altogether from the marine snails. However, there are a few species which live in habitats intermediate between marine and terrestrial, and a few species that are somewhat amphibious between land and freshwater. There are almost no freshwater slugs, although there are a few, please see here:
- Sorry -- I am too busy with creating primary sources to get involved in trying to work out the best way of sorting this all out. Invertzoo (talk) 13:35, 15 April 2017 (UTC)
- Agree with Invertzoo (and with you, KDS4444) on this matter, including on being too busy just now. Anyway, it is typical of the consequences of the policy of basing the arrangement of WP on perceived common names rather than taxonomic realities, and then perpetually trying to make sense of the resulting mess. What really is needed is a decent article on each of the families, and replacing the Snail article with something like Slugs, snails and related Mollusca, linking adequately with Mullusca and the relevant family articles, and with all the other common names and cross-linked to Wiktionary. JonRichfield (talk) 05:13, 16 April 2017 (UTC)