What segmentation does mollusca have?

Mollusks also share features of their organ systems with segmented worms. Unlike segmented worms, however, mollusks do not have body segmentation. The basic mollusk body shape is usually quite different as well.

1. Do molluscs show segmentation?
2. Does Mollusca have segmented body?
3. What type of body segments do molluscs have?
4. Does molluscs have Metameric segmentation?
5. Is Mollusca a bilateral symmetry?
6. Which group of animals has segmented body?
7. What type of skeleton do Mollusca have?
8. Is segmentation present in echinodermata?
9. Do molluscs have a mantle?
10. Do molluscs have legs?
11. Does a Mollusca have a shell?
12. In which group of animals is metameric segmentation found?
13. What is metameric segmentation?
14. What is metameric segmentation name the phylum in which this segmentation is found?

Do molluscs show segmentation?

The phylum Mollusca is the second most diverse phylum after Arthropoda with over 110,000 described species. Mollusks may be primitively segmented, but all but the monoplacophorans characteristically lack segmentation and have bodies that are to some degree spirally twisted (e.g. torsion).

Does Mollusca have segmented body?

> Option A- Mollusca: They are the soft-bodied, coelomate animals. They are bilaterally symmetrical. Their body is unsegmented. They are triploblastic and have three layers.

What type of body segments do molluscs have?

The mollusk body can generally be divided into three regions: the head, the foot, and a cluster of internal organs called the visceral mass. The visceral mass includes many of the organs mentioned in the previous concepts such as the stomach, the heart, the nephridia, and the gonads.

Does molluscs have Metameric segmentation?

Metameric segmentation is absent in platyhelminthes, Echinodermata, Mollusca etc.

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.

Which group of animals has segmented body?

Animals belonging to the phylum Annelida differ from flatworms and roundworms by having segmented bodies.

What type of skeleton do Mollusca have?

Unlike the internal skeleton of humans, mollusks actually have an external skeleton. This exoskeleton protects the animal's soft inner body parts and acts as a sight for muscle attachment.

Is segmentation present in echinodermata?

Taxonomic level: phylum Echinodermata; grade of construction: organs derived from three tissue layers; symmetry: radial, sometimes combined with bilateral; type of gut: blind sac with very reduced anus, or complete with anus; type of body cavity other than gut: coelom; segmentation: none; circulatory system: usually ...

Do molluscs have a mantle?

mantle, also called pallium, plural pallia, or palliums, in biology, soft covering, formed from the body wall, of brachiopods and mollusks; also, the fleshy outer covering, sometimes strengthened by calcified plates, of barnacles. The mantle of mollusks and brachiopods secretes the shell in species that possess shells.

Do molluscs have legs?

Mollusks don't have legs, though some have flexible tentacles for sensing their environment or grabbing things. Most mollusk species grow a hard shell for protection, but their shell grows in only one or two pieces. ... A few snail groups have stopped growing shells; they're called slugs .

Does a Mollusca have a shell?

mollusk, also spelled mollusc, any soft-bodied invertebrate of the phylum Mollusca, usually wholly or partly enclosed in a calcium carbonate shell secreted by a soft mantle covering the body.

In which group of animals is metameric segmentation found?

Metameric segmentation is most strongly marked in annelid worms (e.g. earthworms), in which the muscles, blood vessels, nerves, etc. are repeated in each segment. In these animals the segmentation is obvious both externally and internally.

What is metameric segmentation?

Essentially, metameric segmentation is an internal, mesodermal phenomenon, the body musculature and coelom being the primary segmental divisions; this internal segmentation imposes a corresponding segmentation on the nerves, blood vessels, and excretory organs.

What is metameric segmentation name the phylum in which this segmentation is found?

Annelida and Arthropoda are the only phylum which shows the metamerism segmentation feature.