Questions and Answers
Which of the following organisms are included in the Phylum Mollusca?
What are the three main body parts of Phylum Mollusca?
Visceral mass, foot, mantle
What is the function of the radula in Phylum Mollusca?
Used for scraping, cutting, boring, grating, and conveying food
The class of mollusks known for its tusk shells is called ___
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Match the following classes of Phylum Mollusca with their descriptions:
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Study Notes
General Information on Phylum Mollusca
- Over 150,000 species including snails, slugs, bivalves, octopuses, and squids.
- Body Parts:
- Visceral mass: Contains the internal organs.
- Foot: A muscular organ located on the ventral surface, used for movement.
- Mantle: Body covering on the dorsal surface that secretes a protective calcareous shell, which is energetically costly to produce and transport.
Feeding Apparatus
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Radula: A specialized feeding structure resembling a membranous belt equipped with a series of teeth.
- Operates by sliding over the cartilaginous base known as the odontophore.
- New teeth continuously form at the posterior end, replacing worn ones.
- Arranged in transverse rows for various functions such as scraping, cutting, boring, grating, and conveying food.
Classes of Phylum Mollusca
- Class Aplacophora
- Class Polyplacophora
- Class Monoplacophora
- Class Gastropoda: Includes orders such as P, O, P.
- Class Bivalvia: Contains orders P, L, S.
- Class Scaphopoda: Commonly known as tusk shells.
- Class Cephalopoda: Includes species like nautilus, ammonites, and cuttlefish.
Class Aplacophora
- Comprises approximately 320 species, often characterized by their lack of a traditional shell structure.
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Description
Test your knowledge of Phylum MOLLUSCA with these flashcards covering its seven classes. Learn about their anatomical structure, feeding mechanisms, and diverse species. Perfect for students and enthusiasts of marine biology!
