Ikedidae 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
The Echiura, or spoon worms, are a small group of marine animals. Once treated as a separate phylum, they are now considered to belong to Annelida. Annelids typically have their bodies divided into segments, but echiurans have secondarily los ...
in the suborder
Bonelliida
Bonelliida is a suborder of the order Echiuroidea, an order of polychaete
Polychaeta () is a paraphyletic class of generally marine Annelid, annelid worms, common name, commonly called bristle worms or polychaetes (). Each body segment has a ...
. 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 ''Ikeda''. These worms burrow into soft sediment on the seabed.
Examination of the original material of ''
Ikeda taenoides'' by
Teruaki Nishikawa in 2002 showed that the longitudinal muscle layer lay between the circular layer and the oblique layer, as in all other
echiurans
The Echiura, or spoon worms, are a small group of marine animals. Once treated as a separate phylum, they are now considered to belong to Annelida. Annelids typically have their bodies divided into segments, but echiurans have secondarily los ...
, throwing the validity of the family Ikedidae into doubt. Nishikawa advocates that the family be regarded as a
junior synonym
In taxonomy, the scientific classification of living organisms, a synonym is an alternative scientific name for the accepted scientific name of a taxon. The botanical and zoological codes of nomenclature treat the concept of synonymy differently.
...
of
Echiuridae
Echiuridae is a family of spoon worms in the suborder Echiurida. It is a monotypic family, the only genus being ''Echiurus''. These worms burrow into soft sediment on the seabed.
Species
The World Register of Marine Species recognises the fol ...
.
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:-
[
*'' Ikeda pirotansis'' (]Menon
Menon may refer to:
People
*Menon (subcaste), an honorary title accorded to some Nairs.
Surnamed
*Menon (surname), a surname used historically by those with the title of Menon and now by their descendants.
Given named
* Menon (cookbook author), ...
& DattaGupta, 1962)
*'' Ikeda taenioides'' ( Ikeda, 1904)
References
Echiurans
Monogeneric protostome families
Annelid families
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