A gallery byL23 amcom with 349 images, last updated
Size: 1280x1746 | Tagged: safe, alternate version, artist:catscratchpaper, derpibooru import, applejack, fluttershy, pinkie pie, princess skystar, rainbow dash, rarity, spike, twilight sparkle, alicorn, earth pony, fish, pegasus, seapony (g4), unicorn, my little pony: the movie, applejack's hat, bubble, clothes, cowboy hat, crepuscular rays, cute, digital art, dorsal fin, eyes closed, female, fin wings, fins, fish tail, flower, flower in hair, flowing mane, flowing tail, freckles, glowing, happy, hat, horn, jewelry, lidded eyes, looking at each other, looking at someone, mane seven, mane six, mare, moonfish, necklace, ocean, ocean sunfish, open mouth, pearl necklace, puffer fish, rock, seaponified, seapony applejack, seapony fluttershy, seapony pinkie pie, seapony rainbow dash, seapony rarity, seapony twilight, seaquestria, seaweed, signature, smiling, smiling at each other, species swap, spike the pufferfish, sunfish, sunlight, swimming, tail, underwater, water, wings

Collection of images that features the aquatic species (though not necessarily underwater/inside the ocean) mainly focused on the seapony designs that appeared in the 4th gen (and others that present a similar shape). The hippocampus design can contain variations in their bodies and there might be material that falls under the gray area (hybrid bodies or overlaps with merponies). Therefore, there aren´t strict lines on what counts as "gen 4/2017's movie style" seaponies or not, except for the two limbs/hooves and the big tail. The 4th gen label works as a point of reference.