Assertion: mollusk's shell | /r/HasProperty | internal
Facets:
value: in the adult
type: LOCATION
value: in some snails
type: LOCATION
Source sentences:
text: Most of these species have the body covered by the mantle, thin, easily dilatable membrane that secretes the conchiolin, shell-forming substance or external protective skeleton that has defensive function, this shell can also be internal, protecting the viscera, the animals that lack it present, as alternatives, unique methods of defense, among which are included the cripsis or camouflage in the environment and the chemical defenses .
text: And if another mollusks will have an external shells, this species of mollusks has internal shell.
text: In some snails the entire shell is internal, covered with skin.
text: Shell is either internal or absent, the only exception being species of sub-class Nautiloidea eg Nautilus.
text: In addition, not all mollusks have an external shell: some mollusks such as some cephalopods (squid and octopuses) have an internal shell, and many mollusks have no shell, see for example slug and nudibranch.
text: However, all molluscan shells are formed from the ectoderm (outer layer of the embryo); in cuttlefish (Sepia spp.), for example, an invagination of the ectoderm forms during the embryonic period, resulting in a shell (cuttlebone) that is internal in the adult.
text: Many mollusks have external shells, but others, including octopuses, do not.