If you look at the reptilian portraits #3 looks to me more like a hammerhead shark than a reptile, #5, #6 and #12 resemble fish.
Molluscoids and arthropoids could evolve under water. They'd probably have to come out on land to develop metal making technologies. Take a look at arthropoids #7, #8, #14, #19. Molluscoid #13 looks 'fishy' and several others look like they could have started off 'aquatic'.
If it looks fishy is that enough for you to treat it as aquatic ?
Among the Avian portraits #3 looks more plant than avian to me and I use that for the triffid like plants that are one of my custom species.