How does locomotion take place in an earthworm?
An earthworm moves using circular and longitudinal muscles, as well as bristles called setae. The earthworm can push the setae out of its body to grab the soil around it. To move forward, the worm uses its setae to anchor the front of its body and contracts the longitudinal muscles to shorten its body.
What kind of movement is seen in earthworms .how it is different in snails?
Earthworms move with help of tiny, stiff hair-like projections called bristles. Snail moves with the help of single muscular foot. The rhythmic contractions and relaxations of muscular foot brings about pulling action in the body. A cockroach moves its legs with the help of muscles near the limbs.
How does locomotion occur in earthworm & starfish?
Earthworm locomote using setae. Starfish locomote using tube feet.
Where is Parapodia now?
Parapodia are predominantly found in annelids, where they are paired, un-jointed lateral outgrowths that bear the chaetae. In several groups of sea snails and sea slugs, ‘parapodium’ refers to lateral fleshy protrusions.
What are Parapodia in earthworms?
Parapodia are paired, unjointed lateral appendages found in polychaete worms, which are often fleshy (especially in marine polychaetes) and used for locomotion, respiration, and other functions.
What animals have Parapodia?
Parapodia is the fleshy protrusion found on the marine gastropods. It is used for locomotion and for respiration. Sea snails and sea slugs have parapodia that is used for swimming.
What is the work of Parapodia?
Parapodia are fundamentally the organs of locomotion used both in creeping and in swimming. Considering they are highly vascularized, they also assist the function of respiration.
What type of reproduction is Epitoky?
Epitoky is a form of reproduction observed in polychaete marine worms. The worms undergo a partial or complete transformation into an epitoke, a pelagic morph capable of sexual reproduction.
What is setae nereis?
Nereis possess setae and parapodia for locomotion. They may have two types of setae, which are found on the parapodia. Acicular setae provide support. Locomotor setae are for crawling, and are the bristles that are visible on the exterior of the Polychaeta.
What do nereis eat?
Sandworms are mainly predators who feed on lugworms and amphipods and small bivalves. Nereis virens feeds by capturing a prey with its eversible proboscis which is armed with two strong jaws. They extend part of their digestive tract out of the mouth and grab their prey with their hard jaws.