The Mollusk Hiding Rare Minerals in its Teeth

Chitons are marine creatures with unique teeth made of biominerals like magnetite, making them the hardest known in living organisms. Their radula, similar to human teeth, consists of a flexible stylus and a hard cusp. Some chitons, like the gumboot chiton, incorporate rare minerals such as santabarbaraite into their structure. Chiton teeth undergo a regeneration process involving mineralization, turning from transparent to black as they harden. These adaptations highlight the evolutionary capabilities of chitons in their rock-grazing niche.

What unique feature allows chitons to effectively scrape algae off rocks?

• Their flat, oval shape

• Their strong, metal-infused teeth

• Their ability to swim

• Their colorful shells

How are chiton teeth similar to human teeth?

• Both are transparent when new

• Both are used for chewing food

• Both are made entirely of calcium

• Both have a flexible stylus and a hard cusp

What rare mineral is found in the stylus of some chitons?

• Magnetite

• Calcite

• Santabarbaraite

• Quartz

What process strengthens chiton teeth as they age?

• Mineralization

• Evaporation

• Osmosis

• Photosynthesis

What is the primary reason chitons need to constantly regenerate their teeth?

• Their teeth are lost during molting

• Their teeth are made of soft materials

• Their teeth wear out from scraping rocks

• Their teeth are used for defense