Species
Nautilus macromphalus
Mollusks
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Nautilus macromphalus, commonly called the bellybutton nautilus, is a species of nautilus native to the waters off New Caledonia and northeastern Australia. Unlike most other nautiluses, its shell lacks a callus, leaving the umbilicus exposed so the inner coils of the shell remain visible through an opening that makes up about fifteen percent of the shell diameter at its widest point.
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