Hypnorum "Bubble ?"

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Anonymous (not verified)
Hypnorum "Bubble ?"

Can anyone help me please,
I found a hypnorum with what appeared to be a transparent oval balloon attached to the vent, and with what looked like an egg, and an oversized nematode stuck to the side.
I still have the photos.
It was still alive, but died several hours later.
Its something I have not seen before, and Im curious.

Many thanks