What are the functions of parapodia?

What are the functions of parapodia?

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 are setae and how do they function in movement?

Each segment or section has muscles and bristles called setae. The bristles or setae help anchor and control the worm when moving through soil. The bristles hold a section of the worm firmly into the ground while the other part of the body protrudes forward.

How would setae help in the locomotion of these annelids?

The setae of a segment are extended by certain body muscles to prevent backward movement of the segment during the contraction of the longitudinal muscles. The earthworm is capable of reversing the direction of its movement; the waves of contraction pass forward.

Which annelids have setae?

All annelids except leeches also have chitonous hair-like structures, called setae, projecting from their cuticle. Sometimes the setae are located on paddle-like appendages called parapodia. Annelids are schizocoelous and with a large and well-developed true coelom (i.e., one that is lined with mesoderm).

What is the function of the setae?

Bristles, called setae, are located on each segment of the earthworm’s body. They prevent the earthworm from slipping backwards. FEEDING The earthworm is specially adapted for feeding underground.

What is Nephridia function?

The nephridium (plural nephridia) is an invertebrate organ, found in pairs and performing a function similar to the vertebrate kidney (which originated from the chordate nephridia). Nephridia remove metabolic wastes from an animal’s body.

What is the main function of setae?

What is the function of setae?

Which annelid class has parapodia?

Marine Annelids (class: Polychaeta) The largest class of annelids is polychaeta. Polychaetes have parapodia, fleshy, paddlelike lobes on each segment. Parapodia function in locomotion and gas exchange. Setae are located on the parapodia.

Do annelids have a complete digestive system?

Annelids show the presence of a true coelom, derived from embryonic mesoderm and protostomy. Hence, they are the most advanced worms. A well-developed and complete digestive system is present in earthworms (oligochaetes) with a mouth, muscular pharynx, esophagus, crop, and gizzard being present.