Questions and Answers
What is Class Crinoidea's common name?
Sea lilies
Which of the following are characteristics of echinoderms? (Select all that apply)
What symmetry does Phylum Echinodermata have?
Pentameral symmetry
Define ossicles.
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What is the water vascular system used for? (Select all that apply)
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Which of the following are examples of echinoderms? (Select all that apply)
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What are the types of extant crinoids and their distribution?
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How do pelagic crinoids move?
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Study Notes
Class Crinoidea Overview
- Commonly known as sea lilies.
- Represent a class within the Phylum Echinodermata.
Echinoderm Characteristics
- Exclusively marine organisms.
- Belong to deuterstomes, a group of animals characterized by their embryonic development.
- Possess tube feet for movement and other functions.
- More abundant in past geological periods compared to current numbers.
Symmetry in Echinoderms
- Exhibit pentameral (five-fold) symmetry, a unique feature among invertebrates.
Ossicles Defined
- Composed of calcareous plates that collectively form the skeleton of echinoderms.
Water Vascular System Functions
- Essential for locomotion, enabling movement across surfaces.
- Aids in food gathering, facilitating feeding mechanisms.
- Involved in respiration, allowing gas exchange.
- Provides sensory functions, helping detect environmental changes.
Echinoderm Examples
- Include a diversity of species such as starfish, sand dollars, sea urchins, sea cucumbers, crinoids, and brittle fish.
Types of Crinoids and Their Distribution
- Feather stars are a type of swimming crinoid, known for their graceful movements.
- Pelagic crinoids attach to substrates, appearing to swoop through the water.
Movement of Pelagic Crinoids
- Utilize driftwood to anchor and float with ocean currents.
- Can attach to air-filled bulbs on the water's surface, benefiting from buoyancy to navigate.
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Description
Test your knowledge about Class Crinoidea and the characteristics of Phylum Echinodermata. This quiz covers common names, unique symmetry, and defining features of these marine organisms. Challenge yourself with questions about their classification and anatomy.
