Are you a Tarantula hobbyist? If so, we invite you to join our community! Once you join you'll be able to post messages, upload pictures of your pets and enclosures and chat with other Tarantula enthusiasts. Sign up today!
Its very hard to know for sure. for sibling breeding is pretty much impossible due to the fast growth rate of males. the males will already have died before the sibling female has reached maturity. but for son to mom its possible and only way to know if its documented males are known which mothers they come from and bred back to them.
I think that's nature's way of lessening inbreeding. But it is possible to happen in the wild. I think that inbreeding has lesser effects on invertebrates, but again, this is only my personal view.
Agree, from everything I have seen, inbreeding doesn't affect invertebrates much.
I have also had females mature before males when kept in communals (Assuming to keep the "species" going in the enclosed environment.