Echiuridae is a

family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...

of spoon worms in the suborder

Echiurida Echiurida is a suborder of the order Echiuroidea, an order of polychaete worms. Families The following families are classified within the suborder: * Echiuridae Quatrefages, 1847 *Thalassematidae Forbes & Goodsir, 1841 *Urechidae Monro Monro ...

. It is a

monotypic In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of genera, the term "unisp ...

family, the only

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

being ''Echiurus''. These worms burrow into soft sediment on the seabed.

Species

The

World Register of Marine Species The World Register of Marine Species (WoRMS) is a taxonomic database that aims to provide an authoritative and comprehensive catalogue and list of names of marine organisms. Content The content of the registry is edited and maintained by scien ...

recognises the following

species A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), ...

in the genus:- * '' Echiurus abyssalis'' Skorikow, 1906 * '' Echiurus antarcticus'' Spengel, 1912 * ''

Echiurus echiurus ''Echiurus echiurus'' is a species of spoon worm in the family Echiuridae. It is found in the North Atlantic Ocean and a subspecies is found in Alaska. It burrows into soft sediment and under boulders and stones in muddy places. Description Th ...

'' (Pallas, 1766) * '' Echiurus sitchaensis'' Brandt, 1835

References

{{Authority control Echiurans Annelid families Monogeneric protostome families