placoidian in a sentence
n.
📚 Grade Level: Grade 9, Grade 10, Grade 11, Grade 12
Definition
Placoidian refers to a type of cartilaginous fish characterized by rough skin covered with small, tooth-like structures called dermal denticles.
Sample Sentences
- The placoidians, known for their unique dermal denticles, showcase a fascinating evolutionary adaptation among cartilaginous fish.
- Scientists are studying placoidian scales to understand their role in reducing drag during swimming.
- In marine biology, the term placoidian is often associated with species like sharks and rays.
- The fossil record reveals much about the ancient placoidian forms that once inhabited the oceans.
- Researchers are intrigued by the biological mechanisms that allow placoidian skin to resist wear and tear.