Specifying phylum or classes in a marine only project

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I have a marine biology project which is supposed to be tidal species.
The problem I have is my lack of knowledge on how to make it exclusively tidal and not land species, for example I did have Mollusc as a phylum that accepted these records, but land snails appear, i am trying to resolve this by just adding classes will this resolve my problem?
Is there somewhere that i could check i have the right classes? Using my shoreguide book as help, but that is a bit dated.

Thanks Nick - Jersey - Channel islands.

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If your project is meant to be restricted to a specific place, like the Channel Islands, then you might instead restrict it by geography, by finding a shapefile for the intertidal zones

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you may find this project created by @bobmcd useful: https://www.inaturalist.org/projects/worldwide-marine-life
check out the list of required taxa

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You could set it to user-entered where users place their observations in your project manually, if you don’t want to single out phylums or classes. The downside is that it may not be very active since users would have to discover the project to add to it in the first place.

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I made a few collection projects to make it easier to search for mollusks by habitat. It would be a lot of work to make a marine-only project, but for a specific area it might not be too bad. You can use exclusion filters to get marine mollusks anywhere based on my projects though. I explain that here:
https://www.inaturalist.org/journal/thomaseverest/77252-search-tools-for-mollusks-by-habitat

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I have been working on the filters more in a “draft” project and applied them in a recent bioblitz - World Oceans Week - 2023. I think the filter for the most part is working as one can see when one looks at the map. The membership drive tanked because I was in Australia, primarily birding, at the time and did not apply myself in contacting people, plus we are not supposed to promote projects here although I have done a little sidebar shameless plugs in the past for other ones.

As was mentioned it can be a lot of work, I had to resort to exclude land masses to help because it got to be a lot of back and forth of seeing what still showed up and figuring out at what level of taxonomy do I have to make a change. There are some that have marine, brackish, or freshwater species within a family or genus.

I can be contacted to duplicate this and make someone else a manager - I don’t see how to change the Admin.

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You can check using https://www.marinespecies.org/ - they will list Environment
marine, brackish, fresh, terrestrial

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Not that easy with our large tides. Good idea otherwise.

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You might also try the Marine Life Network, which has an interactive taxonomic tree: https://www.marlin.ac.uk/species/taxonomy - same database as marinespecies.org, but might be easier to navigate.

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