The aperture of the ammonite is basically circular. If the mantle radius is larger than the current aperture radius, the mantle will be compressed but not enough to generate the degree of elastic ...

If, with each new layer, a mollusk deposits a ring of material the same size as the aperture, its shell will lengthen into a cylinder. If, instead, the mollusk increases the circumference of each ...

When presented with a snail with a wider opening, a mantis shrimp attacks that bit relentlessly. “Overwhelmingly they're just hitting the aperture the whole time,” says Stanford University ...

This leggy shell belongs to a group of gastropods called the Spider Conchs, and this particular species is the Scorpion Spider Conch (Lambis scorpio), which can neither bite nor sting. The group gets ...

Barnacles don’t move at all. They cement their heads directly onto the rock and stay there, but periwinkles suction themselves to flat surfaces at their shell aperture, and shove one foot out to ...

For example, the aperture - the ‘opening’ of the shell - is armed with numerous tooth-like barriers, which are most probably useful against predators. "Furthermore, ...

"This may be a big factor, because their tiny shell aperture and epiphragm would prevent inflow of digestive fluids," he said. The snail was study published June 21 in the Journal of Biogeography.

An international team of malacologists discovered a new snail species, Anauchen picasso, in Southeast Asia that exhibits a highly complex and rectangularly angled shell shape, resembling a cubist ...