nautilida

Chambered Nautilus - Nautilus pompilius

Shells of the Chambered Nautilus, Nautilus pompilius (Nautilidae) are formed by two layers. The external layer has a pattern of irregular brown to reddish brown stripes, while the inner layer (as seen in the photo) is striking white iridescent.

The iridescent material inside nautilus shells is sometimes machined into pleasing shapes and sold as “Osmeña pearl.”

References: [1] - [2]

Photo credit: ©Maciej Bledowski

Name: Aturia praeziczac
Location: Luxor governorate, Egypt, Esneh Shale
Age: 49-66 million years ago, Paleogene Period

Again and again, different groups of animals end up with the same shape. The fossil in the photograph is Aturia, a nautiloid. Nautiloids and another group, ammonoids, both have spiral-shaped shells and are commonly confused for one another. Here, the similarity doesn’t stop at the spiral.

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Palau Nautilus (Nautilus bealuensis)

…is a species of nautilus found in the waters around the island of Palau in the Pacific. Like the more popular chambered nautilus (N.pompilius) the Palau nautilus has a closed umbilicus (space between coils of shell) which is covered with a callus. It differs in its modified radula and raised ridges on its shell, which make a cross-grid texture. The Palau nautilus is an opportunistic feeder and will eat arthropods, carrion and anything else it can stomach.

Phylogeny

Animalia-Mollusca-Cephalopoda-Nautilida-Nautilidae-Nautilus-belauensis

Image Source(s)

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