Nautili are the sole living cephalopods whose bony body structure is externalized as a planispiral shell. The animal can withdraw completely into its shell and close the opening with a leathery hood formed …

Jun 16, 2024 · The chambered or pearly nautilus is a cephalopod (a type of mollusk)—a distant cousin to squids, octopi, and cuttlefish. Unlike its color-changing cousins, though, the soft-bodied nautilus …

The chambered nautilus (Nautilus pompilius), also called the pearly nautilus, is the largest and best-known species of nautilus. Among the most common types of nautilus shell are the natural nautilus, …

Nautilus, either of two genera of cephalopod mollusks: the pearly, or chambered, nautilus (Nautilus), to which the name properly applies; and the paper nautilus (Argonauta), a cosmopolitan genus related …

Nautilus shells grow throughout the animal’s life, adding new chambers as it grows larger. The shell’s pearly inner layer, known as nacre, is highly prized for its iridescent beauty.

The nautilus’s most iconic feature is its external, spirally coiled shell. This shell is divided into multiple chambers called the siphuncle, which the animal uses for buoyancy control.

Aug 10, 2025 · The nautilus shell is the external, spiraled, and chambered protective covering of a marine mollusk known as the nautilus. This ancient cephalopod’s shell design has remained largely …