/jp/ - Otaku Culture

More well-known for the diseases they carry, tsetse fly is another insect that bears young live. They likewise have a specialized "milk" gland with which to feed their eggs.

An even rarer form of "vivipary" is shown by Strepsipterans and gall midges. The former has its article on Bogleech, so I'll just direct you there. I didn't even know the female didn't have a genital pore. I just thought the male didn't use them during entry.

http://www.bogleech.com/bio-twisted.html

Gall midges are generally the same with a few main differences: One, the mother is sometimes a fellow larva - many species are paedogenetic, that is, the infantile forms are fertile. Second, the larvae eat their mother alive (in addition to feeding on her tissues first, as with Strepsipterans. The future of the eggs is even determined by the hemolymph they are swimming in! ) before escaping. A number of different larvae can be produced from this paedogenetic larva, one kind develops into adult females, one is identical to her mother, one remains as a larva but produces only males, and a fourth type either produces males or the initial fertile larvae. Unfortunately, the last difference is lack of the neck penetration featured in Strepsipterans, hence why the larvae eat their mother - there's no conveniently located neck hole drilled by their father in their case.