Nereis is a genus of polychaete worms in the family Nereididae. It comprises many species, most of which are marine. Nereis possess setae and parapodia for locomotion and gas exchange. [1] They may have two types of setae, which are found …

It is the slide of parapodium of Nereis. 2. The parapodium is biramous and lies on either side of a segment and is the organ of locomotion (swimming). 3. It comprises a dorsal notopodial and a ventral neuropodial lobe. 4. Each lobe is supported internally by a chitinous rod-like – aciculum. 5. The aciculum bears numerous pointed and serrated setae.

All the segments excepting the head and the last segment bear laterally placed, hollow, mus­cular and vertical, movable paired append­ages parapodia (Sing. Parapodium). The ter­minal segment is termed as the anal seg­ment or pygidium and it bears at its poste­rior end a …

2006年8月8日 · Here we investigate the functional role of the setae in Nereis diversicolor by comparing the locomotor performance of neuropodial seta-ablated worms with normal (control, non-ablated) worms moving on sand and mud. No differences between worms walking on sand and mud were found, except that they were more submerged in the latter substratum.

Parapodium is a side-foot of Nereis. It is a hollow lateral outgrowth of the body. Each segment has a pair of parapodia. They are absent from the first and last segment. Each parapodium is a biramous structure because it is formed of two lobes or rami. The parapodium has a basal region and a distal region. The parapodium

• Nereis specimen shows cylindrical and elongated body form which is divided into similar metameres or segments about 200 in number. • Mouth is found on the anterior surface of the peristomium. • Body segments, except head and anal segment, contain each pair of locomotory parapodia. • Segments are also called as metameres and between two

2013年7月19日 · Nephtyidae—Nephtys: Parapodia are also quite large. Nephtys have rigid, muscular bodies and are active burrowers. Their large parapodia are relatively simple and facilitate movement through substrate. Glyceridae—Glycera: Glycerids are generally carnivorous. They have elaborate burrow systems to lie in wait for prey, and presumably use their ...

2017年8月22日 · Parapodia are primarily the organs of locomotion used both in creeping and in swimming. Since they are highly vascularised, they also serve the function of respiration. Nereis is a genus of Polychaeta worms in the family Nereidae. They …

Lateral outgrowths from the body of an invertebrate are known as parapodia. In Nereis, parapodia are locomotory organs. Parapodia help in crawling and swimming.

Parapodium of Nereis: 1. It is the slide of parapodium of Nereis. 2. The parapodium is biramous and lies on either side of a segment and is the organ of locomotion (swimming). 3. It comprises a dorsal notopodial and a ventral neuropodial lobe. 4. Each lobe is supported internally by a chitinous rod-like – aciculum. 5.