Scientific name：Incilaria spp.
They tend to like the humid environment, and are also more active at nights. They do not like to drier and shadeless environment. In daytime they lurk in the weeds, fences, dead branches, gap between leaves, and they’re able to resist hunger, drought, and coldness. They lay dozens of eggs in one place, usually in or under the soil. They are commonly seen in greenhouses or orchid gardens, and may also be found in shaded flower beds. They are hidden in pots or corners during the day and come out to feed at nights.
The body is shell-free, grayish-black, elongated, with mucus secretion on the surface of the body, and scattered with dark black spots. The length is up to 4 cm.
Scientific name：Vaginulus alte (Ferussac)
They lay eggs around the bottome of the plants, inside stone caves and under fallen leaves. Shellless, dark brown, flat oval, with a yellow vertical line at the center of the back. The body is 7-10 cm long and 2.5 cm wide. The speed of movement is quite fast. They can crawl more than 18 meters per night. They may be found in greenhouses or fields. In daytime they hide in dark and damp places, such as basins, and they come out at night to feed. They will find a place to hide themselves before daylight. When it’s cloudy or rainy, they will also appear on the plants during the day, leaving gray-white transparent mucus on its path. They like to eat younger parts of the plants, and they do not eat from the edges of the leaves, thus cause many holes of different sizes in the center of the leaves.
Scientific name：Bradybaena similaris (Ferussac)
They lay eggs in the soil and produce tens to hundreds of eggs each. Before hatching, the larvae can be seen through the transparent eggshell. The shells are in shape of oblate, with diameter of about 1.5 cm, which is very thin, light brown translucent and some of which has brown stripes in the middle of the last coil. The body is light yellow. Commonly seen on various crops, they like eating fresh leaves, leaving many holes on the plants.