X-ray of rams horn squid shell (Spirula spirula)
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X-ray of rams horn squid shell (Spirula spirula)
Spirula shell. X-ray of the spiral internal shell of a rams horn squid (Spirula spirula). Spirula is unusual among the cuttlefish in retaining inside its body an ancestral shell that related species have discarded during their evolution. The shell is thought to give the animal control over its buoyancy by varying the fluid to gas ratio in the shell chambers. Spirula is a carnivorous mollusc with a large, tentacled body. The ancestor of the cuttlefish and octopusses probably resembled the nautilus, having a spiral, chambered external shell
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Media ID 6466993
© D. ROBERTS/SCIENCE PHOTO LIBRARY
EDITORS COMMENTS
This print showcases the intricate beauty of a rams horn squid shell, specifically an X-ray image revealing its internal structure. The Spirula spirula, also known as the Spirula shell, possesses a unique characteristic among cuttlefish species - it retains an ancestral shell within its body that other related species have discarded over time through evolution. Scientists believe that this remarkable spiral-shaped shell allows the squid to control its buoyancy by adjusting the fluid-to-gas ratio in different chambers of the shell. This ability grants them precise control over their movements in water. Spirula is classified as a carnivorous mollusk and boasts a large body adorned with tentacles. It belongs to a lineage that likely shares similarities with nautilus ancestors, which possessed external chambered shells resembling spirals. The photograph not only highlights the extraordinary nature of this creature but also provides valuable insights into zoology and marine life. With its detailed depiction of the rams horn squid's internal structure, it serves as a testament to the wonders found within our natural world. This stunning image from Science Photo Library captures both scientific curiosity and aesthetic appreciation for these fascinating creatures without any commercial intent.
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