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Living mollusks are usually grouped into eight classes: Gastropoda (see gastropod), Bivalvia or Pelecypoda (see bivalve), Cephalopoda (see cephalopod), Scaphopoda (tusk shells), Aplacophora (Solenogasters), Caudofoveata (sometimes included in the Aplacophora order), Polyplacophora (chitons), and Monoplacophora.
- Why are mollusks classified as invertebrates?
- Is Mollusca a bilateral symmetry?
- Do all mollusks have a shell?
- How do you characterize the mollusks?
- Is an amphibian a vertebrate or invertebrate?
- What are the 3 main mollusks?
- Is a scallop a cephalopod?
- Are mollusks radial or bilateral?
- Which type of symmetry do mollusks have?
- What kind of symmetry do Mollusca have?
- Is an octopus a mollusk?
- Do mollusks have tissues?
- What are 4 examples of mollusks that do not have shells?
Why are mollusks classified as invertebrates?
Mollusks are invertebrates that have a mantle -- a body structure that excretes a shell or protective coating for the animal.
Is Mollusca a bilateral symmetry?
Mollusca can be found in freshwater, marine and terrestrial habitats. More features of molluscs include bilateral symmetry, soft or unsegmented bodies, respiration via ctenidium, ganglia/nerve comprised nervous system, haemocoel body cavity, etc.
Do all mollusks have a shell?
Mollusks usually have a shell (although some do not). Mollusks also have an extension of the body wall called the mantle. This portion of the animal's anatomy is responsible for secreting the shell. The mantle encloses the mantle cavity which contains the Ctenidia (gills), anus and excretory pores.
How do you characterize the mollusks?
Mollusks have a hard outer shell. There is a layer of tissue called the mantle between the shell and the body. Most mollusks have tentacles for feeding and sensing, and many have a muscular foot. Mollusks also have a coelom, a complete digestive system, and specialized organs for excretion.
Is an amphibian a vertebrate or invertebrate?
Vertebrates such as mammals, fish, birds, reptiles and amphibians all have a backbone, whereas invertebrates, such as butterflies, slugs, worms, and spiders, don't. ... Invertebrates can be found in land, marine and freshwater habitats, and live on every continent.
What are the 3 main mollusks?
The three major groups of mollusks are gastropods, bivalves, and cephalopods (SEF ul o pods). The largest group is the gastropods. These are mollusks like snails and slugs that have just one shell or no shell at all. Gastropods creep along on their broad foot.
Is a scallop a cephalopod?
The mollusks that have a hinged, two-part shell joined by strong muscles are called bivalves. Clams, Oysters, and Scallops are bivalve mollusks and are a familiar food source. These three animals pull their shells closed by contracting powerful muscles near the hinge.
Are mollusks radial or bilateral?
Mollusks are generally considered a phylum of bilaterally symmetrical animals, although there are also many asymmetrical species. Bilateral symmetry means that an organism can only be divided into two equal halves if it is cut from top to bottom along the middle of the anterior-posterior (front-back) axis.
Which type of symmetry do mollusks have?
Mollusks have bilateral symmetry. – The two halves of the body mirror each other. Gastropods (snails) ~ eat with a radula (tiny tongue covered with teeth. Cephalopods (squid) ~use tentacles to grab their prey and put it in their powerful jaws.
What kind of symmetry do Mollusca have?
Taxonomic level: phylum Mollusca; grade of construction: organs derived from three tissue layers; symmetry: bilateral; type of gut: complete, with anus; type of body cavity other than gut: coelom; segmentation: absent; circulatory system: usually open to large coelomic cavity; nervous system: brain, with nerve cords ...
Is an octopus a mollusk?
octopus, plural octopuses or octopi, in general, any eight-armed cephalopod (octopod) mollusk of the order Octopoda. The true octopuses are members of the genus Octopus, a large group of widely distributed shallow-water cephalopods.
Do mollusks have tissues?
Mollusks have a hard outer shell. There is a layer of tissue called the mantle between the shell and the body. Most mollusks have tentacles for feeding and sensing, and many have a muscular foot. Mollusks also have a coelom, a complete digestive system, and specialized organs for excretion.
What are 4 examples of mollusks that do not have shells?
Mollusks without shells include squid, banana slugs, and octopi. Some mollusks are terrestrial, occurring in most environments on earth, while others live in the water for some or all of their life.
