INTEG.PRIN.OF ZOOLOGY-EBOOK CODE
18th Edition
ISBN: 9781260914894
Author: HICKMAN
Publisher: MCG
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Chapter 16, Problem 17RQ
Summary Introduction
To determine: The most likely and the closest relatives of molluscs.
Introduction: Annelida is a large phylum consisting of over 22,000 species. This phylum comprises of segmented worms. They are found in the marine environment as well as in hydrothermal vents.
Summary Introduction
To determine: The evidence supporting and contradicting the close relationship between molluscs and annelids.
Introduction: Coelomates are the organisms having a coelom- the body cavity Protostomes is one of the evolutionary pathways which molluscs and annelids have undergone.
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Chapter 16 Solutions
INTEG.PRIN.OF ZOOLOGY-EBOOK CODE
Ch. 16 - Explain how ocean acidification is likely to...Ch. 16 - How does a molluscan coelom develop...Ch. 16 - Prob. 3RQCh. 16 - Briefly describe characteristics of the...Ch. 16 - Briefly describe the habitat and habits of a...Ch. 16 - Prob. 6RQCh. 16 - Prob. 7RQCh. 16 - Prob. 8RQCh. 16 - Prob. 9RQCh. 16 - Use examples to explain how the external...
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- What are two features that put the octopus in the phylum Mollusca?arrow_forwardBriefly describe characteristics of the hypothetical ancestral mollusc, and tell how each class of molluscs (Caudofoveata, Solenogastres, Polyplacophora, Monoplacophora, Gastropoda, Cephalopoda, Bivalvia, Scaphopoda) differs from the ancestral condition with respect to each of the following: shell, radula, foot, mantle cavity and gills, circulatory system, and head.arrow_forwardWhich of the following is the correct classification for the following invertebrate animal: This animal has a wedge shaped muscular "foot", and it is a filter feeder. This animal is covered by two shells connected by hinge ligaments. Question 22 options: a) Phylum Mollusca, Class Bivalvia b) Phylum Chordata c) Phylum Echinodermata d) Phylum Arthropoda, subphylum Hexapoda e) Phylum Platyhelminthes f) Phylum Echinodermata g) Phylum Annelidaarrow_forward
- In the Mollusca phylogenetic tree below, circle the node that corresponds to the latest common ancestor of Scaphopoda and Gastropoda. Label it “A” In the same tree, circle the clade that includes Bivalvia and Cephalopoda. Label it “B”.arrow_forwardIn the different lineages of molluscs, it is easy to understand the variations from the basic organizational plan in relation to the lifestyles of the organisms. For example, the clam is a buried living organism that feeds by filtration and the cuttlefish is a free predatory organism. The organization of Lamellibranchs and Cephalopods can then be related to these lifestyles.Based on the texts provided, the various illustrations and your knowledge, indicate in a short text :Adaptations to filtration in clams (and by extension in lamellibranchs)arrow_forwardMollusca (clams, abalone, nudibranchs, snails, squid, octopi, etc). Unifying features include shell, mantle, radula, foot, visceral mass Which classes show a loss of the shell. How does the shell benefit an organism, how does the loss of the shell benefit other members of this phylum? Distinguish between polyplacophora, bivalva, gastropoda, and chephalopoda We see the first evolution of a true eye here. Who has it? What are chromatophores? How doe members of this group use them? What other unique defense addaptaions do we see in this group? (warning colors, 2 shells, ink)arrow_forward
- A fishing net brings up a soft bodied animal with a coiled external shell. How can you determine whether the animal is a gastropod or a cephalopod? A) give one unique trait that would allow you to identify the organism as a member of class gastropoda. B) give one unique trait that would allow you to identify the organism as a cephalopodarrow_forwardWhat characteristics of Mollusca distinguish it from other phyla?arrow_forwardClass Gastropoda and Class Bivalvia independently evolved modifications to their body plan that allowed them to invade sandy and muddy habitats, burying their bodies under the surface and accessing the surface via siphons. For an example organism in each Class, (1) draw a diagram showing the morphological modifications and (2) write a description of how this organism had evolved from the hypothetical ancestral mollusk (HAM) body plan.arrow_forward
- What are the internal and external structures together with its function of Aplacophora, Monoplacophora, Polyplacophora, Bivalvia, Gastropoda, Cephalopoda, Scaphopoda?arrow_forwardWhile sampling marine plankton in a lab, a student finds a large number of fertilized eggs. The student raises some of the eggs in the laboratory for further study and finds that the blastopore becomes the mouth. The embryo develops into a trochophore larva and eventually has a true coelom. These eggs probably belong to (gastropod/nematode/Platyhelminthes/ or gastropod and nematode)?arrow_forwardWhich of the following is NOT unique to Phylum Mollusca (Radula/chromatophores/coelom/mantle)?arrow_forward
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