Loose Leaf For Integrated Principles Of Zoology
18th Edition
ISBN: 9781260411140
Author: Cleveland P Hickman Jr. Emeritus, Susan L. Keen, David J Eisenhour Professor PhD, Allan Larson, Helen I'Anson Associate Professor of Biology
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 23, Problem 12RQ
Distinguish between ostracoderms and placoderms. What important evolutionary characters first appeared in each group? What are conodonts?
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Mammals are farther removed from echinoderms in phylogenetic alliance as they do with birds. Yet birds have a meroblastic cleavage, whereas mammalian cleavage is holoblastic, like echinoderms.
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In vertebrates, what anatomical structure partially or completely replaces the notochord? 1.) lateral-line system
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Loose Leaf For Integrated Principles Of Zoology
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- What traits in conodonts and ostracoderms are derived relative to those in hagfishes and lampreys?arrow_forwardWhich of the following is not a member of the phylum Chordata? a. Cephalochordata b. Echinodermata c. Urochordata d. Vertebrataarrow_forwardWhy are echinoderms considered part of the Deuterostomes, despite having incredibly unique morphology?arrow_forward
- Tiktaalik and Protarchaeopteryx are examples of transitional forms. In paleontology, what does transitional form mean?arrow_forwardWhat evidences links echinoderms , hemichordates and chordates to the same evolutionary lineage?arrow_forwardECHINODERMS a)- Describe in detail how is the Hydrostatic Vascular System (Aquifer) of the Echinoderms. b) Describe flake is gas exchange in Echinoderms. c) -Why are echinoderms specialists in regeneration?arrow_forward
- Are Protostome and Deuterostomes only applicable to tripoblastic animals?Are Cnidarians even protostome or deuterostomes?arrow_forwardHow can the endoskeleton of echinoderms be characterized in comparison to analogous structures present in vertebrates, arthropods and molluscs?arrow_forwardWhat evidence suggests that radial symmetry in echinoderms was secondarily derived?arrow_forward
- In the rainforest you discover a new species that is terrestrial, has determinate development, molts during its lifetime, and possesses jointed appendages. To which phylum of animals should it be assigned?arrow_forwardA new group of echinoderms, the sea daisies, or concentricycloids, wasdiscovered in 1986. They are deep-water animals living on sunken wood.They are flat and round, looking very much like a small sea star withoutarms. They also lack a gut. Without ever having seen them, why do youthink they were classified as echinoderms, not as members of a new phylum? Do you have any hypotheses as to how they feed or move around?arrow_forwardname and describe the craniates that are not vertebrates?arrow_forward
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