Help me find out what it is. Size is about 4 mm. Does not move, sits on a clam shell.
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Not so sure that’s a limpet. I do remember this one type of harmless hitchhiker snail that was immobile and had a long black proboscis, but I just cannot remember the name. @Isopod80 knew about it, but has not been on Reef2Reef in months .I’m pretty sure that’s a limpet
Hipponix sp. (hoof snail) These snails are unique in the fact that they are sessile. Once attached to a surface they never move. They just feed on what is in reach with their proboscis. They're completely harmless. They're basically the snail version of a barnacle. Not an overly common hitchiker but when they are found, it's usually attached to the shell of a larger snail like yours.
Another unknown creature. It sits on the shell of a snail. photographed through a microscope, so the video quality is poor.
Another unknown creature. It sits on the shell of a snail. photographed through a microscope, so the video quality is poor.