10 Questions
What is a special characteristic shared by all members of the phylum Echinodermata?
Pentamerous symmetrical body
What is the complex of tubes found in echinoderms called?
Water vascular system
When did echinoderms first appear in the geological record?
Cambrian, 600 million years ago
How many widely diverse classes of echinoderms survive today?
Six
What is the meaning of pentamerous symmetry?
It means the body can be divided into two equal halves along five axes/radii
What is the main component of the internal skeleton of echinoderms?
Calcium carbonate with little magnesium carbonate
What is the meaning of the name 'Echinodermata'?
It means spiny skin
What does the term 'test' refer to in the context of echinoderms?
A rigid box-like structure formed by fused calcareous ossicles
What is the reason for the secondary development of pentamerous symmetry in echinoderms?
Due to their adaptation to a sessile way of life
What is the composition of the calcareous skeleton in echinoderms?
Composed of calcium carbonate with little magnesium carbonate
Test your knowledge about the diverse members of the Echinodermata phylum, including starfish, sea cucumbers, sea urchins, brittle stars, feather stars, and sea lilies. Learn about their exclusive marine habitat, unique characteristics, and variations in external appearance.
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