I think I came closely stepping on a Stingray. I’m not sure if it was a Stingray. It had a clear translucent body. Not sure if Stingrays are clear. I recall running through the beach with my cousins and all of sudden, for some unknown reason, I immediately stopped and looked down and saw this thing that had a tail. I realize I almost came to stepping on it. I believe it was in the Santa Cruz Beach.
Sounds like a jellyfish. Santa Cruz, CA?
Their coloration pretty much matches the background of the sand on the bottom, so it may appear that they are translucent and you're seeing the bottom through them.