Keep us posted. I’m really interested. Rabbit snail. Knew it didn’t look like an MTS. I did find this bit of info. From Aquarium Care Basics...
Rabbit Snail Breeding In Freshwater Aquariums
Its not uncommon for Rabbit Snail breeding to occur in freshwater tanks provided conditions are right. The good news is that Rabbit Snail breeding happens slowly. A Rabbit Snail produces one offspring at a time, so the tank does not get overrun like with many other snails.
When Rabbit Snail breeding happens, the snail leaves a small creamy white egg sack behind. The egg sack is about the size of a pencil eraser. Inside the egg sack is a fully formed baby Rabbit Snail, that emerges very hungry. The baby Rabbit Snail will almost immediately begin scouring the tank for
soft algae or other food to eat. One of the nice things to observe about a baby Rabbit Snail is how flawless its shell appears. No pit marks or scuffs, just a well formed whorl from apex to aperture.
And from Aquarium Breeders.com....
Rabbit Snails Maturity.
Rabbit snails have a very low rate of reproduction, so even if they are kept in large groups it
will not be likely to over-populate the aquarium. These
snails give live birth and produce one round white pod every 4 – 6 weeks or so, within which
will be one, two, or rarely three baby
snails.
That could have been a pod. How long have you had Jeremy. Has he been exposed to another rabbit snail? Look around the tank for a baby. I read the female can store sperm for several months.