MARINE BIOLOGY
11th Edition
ISBN: 9781259880032
Author: CASTRO
Publisher: RENT MCG
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Chapter 7, Problem 3CT
Summary Introduction
To explain: The reason why the sea daisies or concentricycloids were classified as echinoderms, and not as the members of a new phylum.
Introduction: Animal phylogeny is the rapidly changing field for the biologists. Even the members of animal kingdom are incredibly diverse, there are various animals sharing certain features that resemble them from other organisms of the kingdom.
Summary Introduction
To propose: A hypothesis is how sea daisies feed or move around.
Introduction: Animal phylogeny is the rapidly changing field for the biologists. Even the members of animal kingdom are incredibly diverse, there are various animals sharing certain features that resemble them from other organisms of the kingdom. Sea daisies are small, circular animals and are related to sea star. They belong to the phylum echinoderms.
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A 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?
Which of the following classes includes the only type of echinoderm that has a calyx on a stalk?
Echinoidea
Holothuroidea
Ophiuroidea
Asteroidea
Crinoidea
Which of the following taxa includes myriapods that are wingless terrestrial mandibulate arthropods that are carnivorous and possess one pair of legs per body segment?
Subclass Apterygota
Class Diplopoda
Class Chilopoda
Subphylum Cheicerata
Order Scorpiones
Chapter 7 Solutions
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- Figure 15.3 Which of the following statements is false? a. Eumetazoa have specialized tissues and Parazoa do not. b. Both acoelomates and pseudocoelomates have a body cavity. c. Chordates are more closely related to echinoderms than to rotifers according to the figure. d. Some animals have radial symmetry, and some animals have bilateral symmetry.arrow_forwardWhich clade does not include humans?(A) synapsids(B) lobe-fins(C) diapsids(D) osteichthyansarrow_forwardMammals 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. How will the mammal convince the bird that it did not deviate from family traditions?arrow_forward
- Suppose you discover a new species of animal that does not have body segments, but is triploblastic, coelomate, and cephalized. Under the molecular phylogenetic scheme, you would allocate it to which phylum? A)Platyhelminthes. B)Arthropoda. C)Nematoda. D)Mollusca. E)Echinodermata.arrow_forwardWithin the subphylum Urochordata is a group called the appendicularians (or larvaceans; class Appendicularia). This relatively obscure group of organisms plays an important role in the global carbon cycle and other biogeochemical processes in the ocean. Use library and Internet resources to research the natural history of these unique invertebrate chordates. What do they eat? How do they capture food?arrow_forwardEchinoderms have _____. a. triangular symmetry b. radial symmetry c. hexagonal symmetry d. pentaradial symmetryarrow_forward
- Why are echinoderms considered part of the Deuterostomes, despite having incredibly unique morphology?arrow_forwardOsteostracans are not included in the Gnathostome clade because [ Select ] ["They have heterocercal tails", "They lack jaws", "They have odontodes (true bone)"] . But they are considered the sister species of Gnathostomes because [ Select ] ["They have jaws", "They have odontodes (true bone)", "They have heterocercal tails"] and [ Select ] ["They have pectoral and pelvic fins", "They have pelvic fins only", "They have pectoral fins only"]arrow_forwardEchinodermata is the first phylum you have examined whose members possess true endoskeletons. What are some advantages that an endoskeleton provides?arrow_forward
- What are examples of the following groups of vertebrates: Chondrichthyes, Actinopterygii, Actinistia, Dipnoi, and Tetrapoda? How many species are in each of the above groups? Which one has the most species? When did the first vertebrates appear, and when did they first live on land? Where do we find the earliest fossils of vertebrates, and where do we find the earliest fossils of terrestrial (land-living) vertebrates? What are the following and how are they related to humans: Pongo, Gorilla, Pan, Sahelanthropus, Ardipithecus, Australopithecus, Homo erectus, and Homo neanderthalensis? Which of these is our closest living relative? What are some of the traits that these organisms share with us? When and where did each of the extinct forms above live? What does this tell us about when our lineage split from the most recent ancestor we share with our closest living relative?arrow_forwardThe tarsier belongs in the suborder ____ because it shares characteristics with both prosimians and anthropoids. a. Haplorhini b. Strepsirhini c. Anthropoidea d. None of the above; the tarsier is placed in its own suborder.arrow_forwardExplain how all echinoderms show five-sided radial symmetry when they look so different. How does a tube foot work? Explain using words and drawings. Most of the echinoderms have hard parts and spines for defense, but the sea cucumbers do not. How do sea cucumbers protect themselves from predators?arrow_forward
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