Bullidae

Bullidae is a family of sea snails, marine gastropod mollusks. These snails are commonly known as bubble snails or bubble shells due to the inflated, shell-like structure they possess. The shell, while often thin and brittle, is typically rounded and hollow, giving the appearance of a bubble. However, this structure is not a true shell in the same way as many other gastropods; it is an internal shell or a reduced external shell that has become internal.

The family Bullidae is characterized by its ovate or globular shell and a generally soft, fleshy body. When retracted, the animal often completely fills the shell. Many species of bullid snails are found in marine environments worldwide, inhabiting various habitats from shallow coastal waters to deeper oceanic regions. They are typically herbivores or detritivores, feeding on algae or decaying organic matter. Reproduction in Bullidae generally involves external fertilization, with females laying egg masses that are often gelatinous. The family is part of the larger superfamily Bulloidea.