Nereididae (formerly spelled Nereidae) are a family of polychaete worms. It contains about 500 – mostly marine – species grouped into 42 genera. They may be commonly called ragworms or clam worms. The prostomium of Nereididae bears a pair of palps that are differentiated into two units. The proximal unit is much larger than the distal unit.

Hediste diversicolor, commonly known as a ragworm, is a polychaete worm in the family Nereididae. It lives in a burrow in the sand or mud of beaches and estuaries in intertidal zones in the north Atlantic.

rag worm, any of a group of mostly marine or shore worms of the class Polychaeta (phylum Annelida). A few species live in fresh water. Other common names include mussel worm, pileworm, and sandworm. Rag worms vary in length from 2.5 to 90 cm (1 inch to 3 feet); they are commonly brown, bright red, or bright green.

Ragworms spend their lives in U- or J-shaped burrows in the rich estuarine mud, extracting nutrients from their surroundings in various ways. A pair of hard pincer-like jaws (paragnaths) …

Hediste diversicolor is one of the commonest intertidal polychaetes in estuaries. Its body appears flattened with a prominent dorsal blood vessel. Adults may reach 6-12 cm in length and consist of between 90-120 chaetae bearing segments (chaetigers).

2008年10月7日 · Steve Walker takes a close look at Ragworm, one of the most effective, most available and most frightening sea fishing baits. Ragworm are among the most common marine organisms and belong to the phylum annelida family of invertebrates.

The common ragworm Hediste diversicolor inhabits the shallow marine and brackish waters in the North Temperate Zone of the Atlantic. This infaunal species builds U or Y-shaped burrows in the soft sediments. H. diversicolor is gonochoristic and remains atokous throughout its life.

Ragworms are a favourite food of flatfish and wading birds, including curlew and bar-tailed godwits. Most often hidden in its burrow, though sometimes caught out hunting or hiding under rocks near to its burrow. They are highly segmented and look like a millipede. They are normally pale brown but males are bright green during the breeding season.

ragworm /ˈræɡˌwɜːm/ 1. N any polychaete worm of the genus Nereis, living chiefly in burrows in sand or mud and having a flattened body with a row of fleshy parapodia along each side 沙蚕 (US name clamworm)

Ragworm is a generic term for one of the most effective and popular sea fishing baits. They are classed as polychaete (segmented) worms, with hundreds of species existing on a worldwide basis.