# Spionida

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Order of annelid worms

Spionida Magelona johnstoni with long feeding palps. Scientific classification Kingdom: Animalia Phylum: Annelida Clade: Pleistoannelida Clade: Sedentaria Infraclass: Canalipalpata Order: Spionida Families Several, see text

**Spionida** is an [order](/source/Order_(biology)) of marine [polychaete](/source/Polychaete) worms in the [infraclass](/source/Infraclass) [Canalipalpata](/source/Canalipalpata). Spionids are cosmopolitan and live in soft substrates in the [littoral](/source/Littoral_zone) or [neritic zones](/source/Neritic_zone).[1]

## Characteristics

Spionids have a single pair of flexible feeding [tentacles](/source/Tentacle) with grooves, arising directly from the [prostomium](/source/Prostomium). The mouth has no jaws and the pharynx is partly eversible. Some species have small eye spots and some a central sensory lobe. Some of the anterior segments paired gills. The [parapodia](/source/Parapodium) or lateral lobes have large lamellae. The [chaetae](/source/Chaeta) are unbranched capillaries, spines and hooks.[1][2]

## Families

According to the [World Register of Marine Species](/source/World_Register_of_Marine_Species) (WoRMS), the Spionida comprises six families in a single suborder:[3]

- Order **Spionida** - Suborder [Spioniformia](https://en.wikipedia.org/w/index.php?title=Spioniformia&action=edit&redlink=1) - [Apistobranchidae](/source/Apistobranchidae) Mesnil and Caullery, 1898 - [Longosomatidae](/source/Longosomatidae) Hartman, 1944 - [Magelonidae](/source/Magelonidae) Cunningham and Ramage 1888[4] - [Poecilochaetidae](/source/Poecilochaetidae) Hannerz, 1956 - [Spionidae](/source/Spionidae) Grube, 1850 - [Trochochaetidae](/source/Trochochaetidae) Pettibone, 1963 - [Uncispionidae](/source/Uncispionidae) Green, 1982

Other families such as [Aberrantidae](/source/Aberrantidae) and [Magelonidae](/source/Magelonidae) are sometimes included in Spionida.[5]

## References

Wikimedia Commons has media related to [Spionida](https://commons.wikimedia.org/wiki/Category:Spionida).

1. ^ [***a***](#cite_ref-AR_1-0) [***b***](#cite_ref-AR_1-1) [Annelid Resources](http://www.annelida.net/nz/Polychaeta/Clade/clade-spionida.htm)

1. **[^](#cite_ref-2)** [Marine Species Identification Portal](https://species-identification.org/species.php?species_group=macrobenthos_polychaeta&id=362&menuentry=groepen)

1. **[^](#cite_ref-3)** Read, G.; Fauchald, K. (Ed.) (2021). ["Spionida"](https://www.marinespecies.org/aphia.php?p=taxdetails&id=889). *WoRMS*. [World Register of Marine Species](/source/World_Register_of_Marine_Species). Retrieved 11 April 2021.{{[cite web](https://en.wikipedia.org/wiki/Template:Cite_web)}}: CS1 maint: multiple names: authors list ([link](https://en.wikipedia.org/wiki/Category:CS1_maint:_multiple_names:_authors_list))

1. **[^](#cite_ref-4)** ["Magelonidae"](https://paleobiodb.org/classic/basicTaxonInfo?taxon_no=355030). *[Paleobiology Database](/source/Paleobiology_Database)*. Retrieved 11 April 2021.

1. **[^](#cite_ref-5)** ["Spionida"](https://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=555673). [Integrated Taxonomic Information System](/source/Integrated_Taxonomic_Information_System). Retrieved 10 April 2021.

Taxon identifiers Spionida Wikidata: Q3615298 Wikispecies: Spionida ADW: Spionida AFD: Spionida BOLD: 24830 CoL: 44T GBIF: 474 iNaturalist: 152938 IRMNG: 10585 ITIS: 555673 NBN: NHMSYS0000841393 NCBI: 46589 NZOR: 87564b4e-73d5-4995-aa26-684953ce5ead Open Tree of Life: 490721 Paleobiology Database: 354932 WoRMS: 889

Authority control databases: National Israel

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Adapted from the Wikipedia article [Spionida](https://en.wikipedia.org/wiki/Spionida) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Spionida?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.