Textbook Question
What is a lophophore?
a. A specialized filter-feeding structure
b. The single opening in species with a blind gut
c. A distinctive type of larva with a band of cilia
d. A synapomorphy that defines lophotrochozoans
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Ch. 31 - Protostome Animals
Freeman7th EditionBiological ScienceISBN: 9783584863285
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Table of contents
- Ch. 1 - Biology: The Study of Life11
- Ch. 2 - Water and Carbon: The Chemical Basis of Life10
- Ch.3 - Protein Structure and Function11
- Ch.4 - Nucleic Acids and the RNA World10
- Ch. 5 - An Introduction to Carbohydrates10
- Ch. 6 - Lipids, Membranes, and the First Cells10
- Ch. 7 - Inside the Cell10
- Ch. 8 - Energy and Enzymes: An Introduction to Metabolism10
- Ch. 9 - Cellular Respiration and Fermentation16
- Ch. 10 - Photosynthesis14
- Ch. 11 - Cell-Cell Interactions14
- Ch. 12 - The Cell Cycle12
- Ch. 13 - Meiosis13
- Ch. 14 - Mendel and the Gene32
- Ch. 15 - DNA and the Gene: Synthesis and Repair8
- Ch. 16 - How Genes Work35
- Ch. 17 - Transcription, RNA Processing, and Translation16
- Ch. 18 - Control of Gene Expression in Bacteria19
- Ch. 19 - Control of Gene Expression in Eukaryotes17
- Ch. 20 - The Molecular Revolution: Biotechnology, Genomics, and New Frontiers23
- Ch. 21 - Genes, Development, and Evolution13
- Ch. 22 - Evolution by Natural Selection17
- Ch. 23 - Evolutionary Processes13
- Ch. 24 - Speciation15
- Ch. 25 - Phylogenies and the History of Life13
- Ch. 26 - Bacteria and Archaea17
- Ch. 27 - Diversification of Eukaryotes19
- Ch. 28 - Green Algae and Land Plants18
- Ch. 29 - Fungi19
- Ch. 30 - An Introduction to Animals9
- Ch. 31 - Protostome Animals20
- Ch. 32 - Deuterostome Animals19
- Ch. 33 - Viruses16
- Ch. 34 - Plant Form and Function16
- Ch. 35 - Water and Sugar Transport in Plants16
- Ch. 36 - Plant Nutrition13
- Ch. 37 - Plant Sensory Systems, Signals, and Responses16
- Ch. 38 - Flowering Plant Reproduction and Development16
- Ch. 39 - Animal Form and Function16
- Ch. 40 - Water and Electrolyte Balance in Animals16
- Ch. 41 - Animal Nutrition16
- Ch. 42 - Gas Exchange and Circulation16
- Ch. 43 - Animal Nervous Systems16
- Ch. 44 - Animal Sensory Systems16
- Ch. 45 - Animal Movement11
- Ch. 46 - Chemical Signals in Animals16
- Ch. 47 - Animal Reproduction and Development18
- Ch. 48 - The Immune System in Animals16
- Ch. 49 - An Introduction to Ecology16
- Ch. 50 - Behavioral Ecology16
- Ch. 51 - Population Ecology16
- Ch. 52 - Community Ecology20
- Ch. 53 - Ecosystems and Global Ecology16
- Ch. 54 - Biodiversity and Conservation Ecology16
Chapter 31, Problem 3
One trait that is shared by the Lophotrochozoa and Ecdysozoa is_________:
Verified step by step guidance1
Begin by understanding the classification of Lophotrochozoa and Ecdysozoa. Both are major clades within the Protostomes, which are a group of animals that develop the mouth before the anus during embryonic development.
Recognize that Lophotrochozoa includes phyla such as Mollusca and Annelida, while Ecdysozoa includes phyla such as Arthropoda and Nematoda.
Identify the shared trait between these two groups. Both Lophotrochozoa and Ecdysozoa exhibit bilateral symmetry, which means their body plan is symmetrical along a central axis.
Understand that bilateral symmetry is a common trait among many animals, allowing for streamlined movement and the development of complex body structures.
Consider the evolutionary significance of bilateral symmetry, as it is associated with the development of a head (cephalization) and a more efficient nervous system, which are advantageous for survival and adaptation.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Lophotrochozoa
Lophotrochozoa is a clade within the animal kingdom that includes organisms such as mollusks and annelids. They are characterized by having a lophophore, a specialized feeding structure, or a trochophore larval stage. Understanding their developmental stages and feeding mechanisms is crucial for identifying shared traits with other clades.
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11:32
Lophotrochozoans
Ecdysozoa
Ecdysozoa is another major clade of animals, including arthropods and nematodes, characterized by their ability to molt or shed their exoskeleton through a process called ecdysis. This molting process is a key evolutionary trait that distinguishes them from other animal groups and is essential for growth and development.
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08:01Arthropods and Chelicerata
Shared Traits in Animal Clades
Shared traits between Lophotrochozoa and Ecdysozoa can include aspects of their developmental biology or evolutionary adaptations. While they differ in their molting and larval stages, both clades exhibit bilateral symmetry and complex organ systems, which are fundamental characteristics of most animals within these groups.
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05:42Shared Derived Characters
Related Practice
Textbook Question
What is the function of the arthropod exoskeleton?
a. The presence of an exoskeleton has given arthropods a good fossil record, because hard parts fossilize more readily than do soft tissues.
b. It has no well-established function. (Trilobites had an exoskeleton, and they went extinct.)
c. It provides protection and functions in locomotion.
d. It makes growth by molting possible.
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Textbook Question
Which protostome phyla successfully made the transition from water to land? Select True or False for each phylum.
T/FMollusca
T/FArthropoda
T/FAnnelida
T/FNematoda
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Textbook Question
Which of these characteristics does not apply to cnidarians?a. are diploblasticb. possess a gastrovascular cavity with one openingc. undergo metamorphosisd. have a central nervous system
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Textbook Question
Propose an explanation for why annelids and arthropods were thought to be closely related, before phylogenetic analyses in the late 1990s.
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