I honestly have no idea. When answering this question, imagine something like a seawing, since that's kinda what I'm asking this question about.
What animal group would a water dragon be in?
@SapphireMoondancer
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Dragon I see a reptiles, but if you want something realistic, I suggest find the Animal Planet video on Dragons.
group
They would be considered a marine reptile, probably. I've been studying animals and mythical creatures basically since I came out the womb and that would be my guess. An example of a marine reptile would be like a sea turtle.
Marine reptile definitely, but you could also try a more amphibian mix too? I don't remember much about sea wings but still it could be neat