What are the two functions of parapodia?
Most species of polychaete annelids have paired, fleshy parapodia which are segmentally arranged along the body axis. Parapodia vary greatly in size and form, reflecting their variety of functions, such as gas exchange, anchorage, protection and locomotion.
Which of the following are typically functions of the parapodia in Errantia?
Parapodia can also have branched outgrowths called branchia which often function as gills. Errantia is one of the two major groups of polychaetes. They generally have large, well-developed parapodia. Nereididae—Nereis brandti: Parapodia are large and are used for fast crawling and swimming.
Do earthworms have parapodia?
The basic features of locomotion in annelids are most easily observed in the earthworm because it lacks appendages and parapodia. Movement involves extending the body, anchoring it to a surface with setae, and contracting body muscles.
What is parapodia Where are the present?
These parapodia are predominantly found in the phylum of annelids. These can be either paired, un-jointed with the presence of lateral outgrowths that bear the chaetae. These structures are commonly found in several groups of sea snails and sea slugs, ‘parapodium’ refers to lateral fleshy protrusions Polychaeta.
How do earthworms move?
How do earthworms move? Earthworms have groups of bristles on each segment of the body that move in and out to grip surfaces as they stretch and contract their muscles to push themselves forward or backward. They tend to move forward.
What was the longest earthworm ever found?
The longest earthworm is Microchaetus rappi of South Africa. In 1967 a giant specimen measuring 6.7 m (21 ft) in length when naturally extended and 20 mm (0.8 in) in diameter was found on a road between Alice and King William’s Town.
Is parapodia present in oligochaeta?
With around 10,000 known species, the Oligochaeta make up about half of the phylum Annelida. These worms usually have few setae (chaetae) or “bristles” on their outer body surfaces, and lack parapodia, unlike polychaeta.
Where is parapodia seen what is its function?
Parapodia are the paired appendages which are laterally present in the body segments of the Annelids. The main functions of parapodia are locomotion, feeding and respiration.
Is parapodia present in Arthropoda?
As we have seen that arthropods have a chitinous exoskeleton, metameric segmentation and jointed appendages. Consequently, Arthropods don’t have parapodia. > Thus, the correct answer is Parapodia which is not present in the Phylum-Arthropoda.