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Podocinum vs Pergamasus vs Gamasid mites

Short version of question: How does "Gamasid mites" fit into the classification? I'm especially interested in "Podocinum sp" (assuming the pic I found is correct) which is supposed to be a "Gamasid mite" they say.

Longer version:
I found bugs in plant soil and got worried it came with the palm seeds I planted. Since there are no green parts on the seedling yet the only bugs I could think of were springtails or root mealybug crawlers but they don't look much like mine. I drew a pic which I don't seem to be allowed to show here, but they are light brown, body ½mm long and they look very much like the pic with text "Podocinum sp." under headline "Gamasid mites" here:

They also look rather similar to Pergamasus but they seem to have a fatter end part of the body so "Podocinum sp." comes closer, in the mentioned pic. The Podocinum pic at doesn't look much like it though (too yellow and too long antennas).

I find these sorted under these headlines:

Mites and Ticks (Acari) » Parasitiformes » mesostigs (Mesostigmata) » Parasitina » Parasitoidea » Parasitidae » Pergamasinae » Pergamasus

Mites and Ticks (Acari) » Parasitiformes » mesostigs (Mesostigmata) » Dermanyssina » Phytoseioidea » Podocinidae » Podocinum

Seems they are not even very closely related?

In the end what I most of all want to find out is if they can be dangerous to plants. The twice as long back legs and quite fast speed I think might suggest they are predators (and the only thing I can imagine there is to eat are springtails)? If so then could I feel assured they wont eat plants?

There are thousands of mite species.
The surest way of finding out what you've got (and whether or not they are a threat to your plants) is to get a photo and post it to ID Request.

Welcome to BugGuide!

I don't have a camera good en
I don't have a camera good enough for that but I'll try posting my drawing and a photo I found and see what you say.

Unfortunately, they probably won't help.
The photos to which you linked show mites that are already identified--but there is no way to tell if yours is either one (or something completely different) without seeing it. The drawing could apply to any number of mites; it doesn't show the details needed for an ID.

If you know someone with a better camera, see if they can get a photo of your critters. Our experts are good, but they really need to see what you've got to tell you what it is.

I did as you said and request
I did as you said and requested ID. It was moved here:

Seriously, as I said, maybe I don't need to know exactly which species it is as long as I feel assured it doesn't live on plants. Am I wrong in assuming it is a predator based on leg length and speed?

Yes. As I noted, the drawing is not helpful
I added a comment under it with the name of one of our mite experts and a link to his contact information. You may want to contact him directly with your questions.