Body shape Symmetry Periproct Location Spines Regular Echinoids Irregular Echinoids 5 fold Advantage to burrowing?
Body shape Symmetry Periproct Location Spines Regular Echinoids Irregular Echinoids 5 fold Advantage to burrowing?
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
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Regular Echinoids | Irregular Echinoids | Advantage to burrowing ? | |
Body shape | Globular shaped skeleton | Heart- shaped | The flattened body shape of the regular and irregular echinoids help them to burrow through the sediment. |
Symmetry | 5 fold | Bilateral symmetry | The five-fold symmetry of the regular echinoids help in burrowing. |
Periproct location | Centrally located | Located towards the posterior end | The location of periproct in both regular and irregular echinoids do not affect burrowing. |
Spines | Spines are used for locomotion as well as defence and are made up of calcite. | Spines like hairs | The presence of spines in both regular and irregular spines prove advantageous for burrowing as well as for locomotion. |
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