The Bombyx hybrid is a hybrid between a Bombyx mori female and a male Bombyx mandarina moth. They produce Silkworm larvae like all species of Bombyx. The larvae look a lot like the other variation, they are brown and the first half and gray at the bottom half, but they get larger black spots than the other variation, and they look like a normal Bombyx moth, but a bit darker. Instead, no hybrids are used for silk, (unlike a normal Silkworm of the Bombyx mori species), but for research. Bombyx mori females are much more likely to mate with a male Bombyx mandarina, but both species have to be kept in the same container. Since Bombyx Hybrids are much more common than the other variation more is known about them.
The domesticated silkworm (B. mori) was domesticated from wild silkworm (B. mandarina) more than 5,000 years ago.