This time male and female of one species.
Fiscotaurus is a small and harmless cuspipodid, but it's a good organism to describe the reproduction strategy of this clade.
In the case of Cuspipoda only the males produce reproductive cells (which are similar to sperm). They produce them in the Exouterus and conduct them into a special bag near the eyes where they are packed to spermatophores. These packets are handed over to the female by an stiff cannula. Some species can knock off these structures after the mating so that the female can be only copulated by one male. Other species don't posses this alien penis/vagina and transfer the spermatophores orally (there are evidences that females can have a tastegasm).
The spermatophores are slide through an channel into the Exouterus of the female. Here they enter into an organ which looks a bit like a lung. The shell around the spermatophres mold away and the reproductive cells are spread within the Exouterus. That's the moment when the female slaugh this organ. This have a simple reason.
The productive cells of male cuspipodids are working much more like viruses than it's earthly counterpart do it. The sperm not only attack reproductive cells but all cells of the female it can find.
When a spermatozoon has found a cell which it can enter... it enter, and the two cell cores fuse. from this moment on the real run of survival beginns, the newborn cuspipodid is very predatory and feed on all other cells around it, even it's brothers and sisters. The gender of the new liveform is decided by the epigenetic programm of the cell the spermatozoon enter.
When the embryo is six times bigger than it's original form it stops to eat its siblings. Now it use its new, microscopic radula like organs to feed on the material around it. Before the mating the female moved some extra nutrients into the Exouterus to provide a good start for its offspring. After a few days/weeks the up to 800 embryos have absorbed everything but the shell of it's incubator. Now they pupating and form themselves into something which looks like an miniature form of an adult (but mostly without the often characteristic horns and crests). After hatching they leave the Exouterus and begin to search for food.
The famale used its after calws to give its children the best position for their first days out of the shell. Some species hang their Exouterus at the underside of an branch, others dig a hole with them and a few use their claws to sting into roots so that the small Cuspipoda can feed on the juice when they hatch.