The shell form also embodies the same proportional values as the Modulor, based on the Golden section.
However, this genus may prove to be a composite taxon, given the diversity of the shell forms.
It stops its actions in daytime and reverts to an unpenetratable hard shell form.
Decomposing shell form into size and shape by geometric morphometric methods in two sympatric ecotypes of Littorina saxatilis.
When preparing for moult, the old shell is softened and partly eroded away, while the rudimentary beginnings of a new shell form under it.
The facades has two levels the top of the portal is framed by a shell form.
Modern monoplacophorans have less diverse shell forms than fossil genera.
Periostracum is an integral part of the shell, and it forms as the shell forms, along with the other shell layers.
The influence of these predators on the evolution of shell form in Nucella (and other molluscs) is mentioned on p. 327.
In chickens, it can infect eggs before the shell forms, so even clean, fresh eggs may harbor salmonella.
