Snails have shells the moment they're born, but it's kind of hard to tell. In fact, it's hard to even see a baby snail. Some are nearly microscopic, such as Angustopila psammion, whose adult-sized ...

Many parasites and hosts are embroiled in an on-going arms race that affects the evolution of each participant. One such battle is between parasitic nematodes and terrestrial gastropods which have ...

The Shell is a calcareous concave cone coil clockwise in three or four whorls. The shell is covered by a thin coating called the cuticle or periostracum which gives it color. The shell is secreted by ...