Echinodermata Classification and Characteristics

The video provides an overview of the phylum Echinodermata, highlighting its exclusively marine nature and its classification into five main classes: Asteroidea, Ophiuroidea, Holothuroidea, Echinoidea, and Crinoidea. Each class is discussed in detail, focusing on their unique features, examples, and locomotive structures. The video concludes with a comparative analysis of these classes, emphasizing their differences and commonalities.

What is the primary habitat of animals in the Phylum Echinodermata?

• Freshwater

• Terrestrial

• Aerial

• Marine

Which of the following is NOT a class within Phylum Echinodermata?

• Ophiuroidea

• Mollusca

• Holothuroidea

• Asteroidea

What is a distinctive feature of the class Asteroidea?

• Sedentary lifestyle

• No tube feet

• Radially arranged arms

• Leathery body

Which class is commonly known as brittle stars?

• Asteroidea

• Echinoidea

• Holothuroidea

• Ophiuroidea

What is a unique characteristic of Holothuroidea?

• Star-shaped body

• Cucumber-like body

• Presence of spines

• Sedentary lifestyle

Which class is characterized by a leathery body wall?

• Ophiuroidea

• Asteroidea

• Holothuroidea

• Echinoidea

Which class includes animals commonly known as sea urchins?

• Echinoidea

• Holothuroidea

• Ophiuroidea

• Asteroidea

What is a defining feature of the class Crinoidea?

• Flower-like body

• Cucumber-like body

• Star-shaped body

• Globe-like body

Which class is known for having a simple body structure with no arms?

• Asteroidea

• Ophiuroidea

• Holothuroidea

• Echinoidea

What is the common name for members of the class Crinoidea?

• Sea lilies

• Sand dollars

• Sea cucumbers

• Brittle stars