placoides in a sentence
n.
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Definition
Placoides are small, tooth-like scales on the skin of cartilaginous fish, such as sharks and rays, that help reduce drag in water.
Sample Sentences
- Placoides are a type of scale found on the skin of cartilaginous fish like sharks and rays.
- The unique structure of placoides helps reduce drag as the fish swims through water.
- Researchers are studying the evolution of placoides to better understand fish adaptation over time.
- In some marine environments, placoides serve as a protective barrier against parasites and injuries.
- The fossil record shows that placoides have been present in species for millions of years.