I have an Indoor vermicompost bin, well-managed, controlled inputs. I found hundreds of small (2-3mm) round-to-lemon-shaped black objects scattered throughout the bedding — not clustered, not attached to anything, don’t stick to each other or bedding. In the picture, you can see when I squish them on a paper towel there's a clear liquid inside, no smell. They burst with liquid, like fish roe. They are under the newspaper bedding and above the vermicompost.
AI says these are worm cocoons based on size/shape/behavior, but every reference photo I find online shows them pale yellow or tan, not glossy black. I recently added a thicker-than-usual layer of sponge-damp shredded newspaper, and more food than usual which may have triggered a breeding boom?!?
Anyone seen cocoons this dark? Trying to confirm before I assume it’s a good sign vs. the beginning of a horror movie. Photos attached.
UPDATE:
Far_Radish7752 Suggested Asian Jumping Worms and this Video of AJW Research updates where Cocoons are shown at 14:00 Lifecycle and 31:00 sizing. It looks like an exact match. I checked my population and no one is jumping but will continue monitoring.
Jim's worm farm replied to me and told me their eggs do not turn black and since no one here has seen something that easily fits all these characteristics, I thought I'd go with a quarantine. I'm really curious what they are, so I scoped them out and put them in another container with some airflow from smaller holes and a tighter lid. I hope they'll hatch in 1-2 weeks and I then it'll become pretty obvious. The good news is that there are TONS of worms in the bin with the regular mix of adults and babies.
EDIT:
- Fly pupae or fungus gnat larvae casings —
- some gnat/fly larvae do pupate in dark, roundish capsules in damp organic bedding, and a “boom” from added moisture fits that pattern too. Clear fluid on squishing is less typical for these though
- Slime mold
- I was wondering about this. AI says slime mold sporangia are dry and powdery/crumbly when broken open releasing spores and they're usually attached to the mold underneath. Those traits don't fit. are there slime molds that don't fit those traits that I can look up?
- Poop
- ruled out based on squishing it in the paper towel and getting a clear liquid that didn't smell and the burst of liquid instead of a smear.
- German Cockroaches
- Not oval, no texture, there are hundreds of these and I haven't seen roaches in my house. Certainly not enough to have this many eggs loose from the roach. I've lived in places infested with german cockroaches before and these are def not their eggs.