Nautilus shell. Section through the shell of a nautilus (Nautilus sp.), revealing the spiral structure and chambers (camerae) of mother-of-pearl (nacre). The nautilus is a marine cephalopod related to the squid, which inhabits the Indo- Pacific region.animal, biology, cephalopod, chambers, cross section, fauna, invertebrate, marine, mollusk, mother of pearl, nacre, nacreous, nautilus, section, shell, slice, sliced, spiral, squid, zoology.
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