Fascinating. Reminds me of Tribulus Terrestris seeds, or the australian three cornered jack, but those are not aquatic.
Water Caltrops, in the other hand, look more similar. Trapa Natans. But the four-leaf bit agrees with the white flowers, not the leaf. And yours have barbed spears!! :shock:
I think something that unique should be an easy look up. Just type into a searcher the body of water or region of the ocean/planet you are in and aquatic plant species list thorn seeds(if these are seeds then?) Maybe search images for aquatic thorns. But be careful just because someone says it is something on their blog dont mean thats what it is. Also search a reputable scientifical site that can give you a more accurate description.
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