INTEGRATED PRINC.OF ZOOLOGY(LL)(FD)
17th Edition
ISBN: 9781260704310
Author: HICKMAN
Publisher: MCGRAW-HILL CUSTOM PUBLISHING
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Textbook Question
Chapter 12, Problem 14RQ
What features make placozoans interesting from a phylogenetic perspective?
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Which class of Cnidarian is described below:
This class includes the corals and the sea anemones. Individual animals are cylindrical in shape and are attached directly to a substrate in the polyp body form.
Question 18 options:
a)
Class Hydrozoa
b)
Class Scyphozoa
c)
Class Cubozoa
d)
Class Anthozoa
Placozoans are structurally simple. They have no mouth, gut, or nervous system and only a few distinct cell types. This
simplicity is thought to be secondarily derived, because they
have an asymmetrical adult stage.
are composed of an upper and lower body surface that sandwiches a layer of contractile fibers.
exhibit asexual and sexual reproduction.
are sessile filter feeders.
are found in tropical and subtropical oceans.
What is unique about the madreporite of sea cucumbers (class Holothuroidea)?
Chapter 12 Solutions
INTEGRATED PRINC.OF ZOOLOGY(LL)(FD)
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- What are the phylogenetic relationships among and within each phyla (Mollusca, Annelida, and Platyhelminthes) ?arrow_forwardWhat characteristics distinguish Branchiopoda, Ostracoda, Copepoda, Thecostraca, and Malacostraca?arrow_forwardThree major phylogenetic groups of Bilateria are currently recognized: Ecdysozoa, Lophotrochozoa, and Deuterostomia. Which of these three groups is least diverse? Where are humans?arrow_forward
- A previously unknown animal is being studied so that it can be classified. It is an invertebrate, triploblastic, dorsoventrally flattened, acoelomate, and has flame cells. Which phylum would you place it in? A)Arthropoda. B)Porifera C)Mollusca. D)Platyhelminthes. E)Cnidaria.arrow_forwardHow many kinds of mesozoans exist and where would you search for them?arrow_forwardWhat is the reason for saying that sponges are closely related to, and probably evolved from, several members of the Kingdom Protozoa?arrow_forward
- What appendages characterize chelicerates?arrow_forwardThe paraphyletic phylum Choanozoa contains chytrid zoospores and human sperm, among many other creatures. What are some important aspects of the group, in terms of its evolutionary significance?arrow_forwardWhich characters differentiate living cyclostomes and living chondreityans?arrow_forward
- What is the following specimen? Our invertebrate zoology professor told us there is a bryozoan on this rock? What group does it belong in? Genus?arrow_forwardWhat are three examples of species of cnidarians?arrow_forward1. Where do Loricifera fit into a phylogeny? Explain with an image. 2. What is a body plan of Loricifera (ex: deuterostomate? acoelomate?) 3. What is the support of Loricifera?arrow_forward
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