Sedentaria

Sedentaria
	Examples of Sedentaria (clockwise from upper left corner): Sabellida, Echiura, Maldanomorpha, Clitellata, Terebelliformia, Siboglinidae.
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Annelida
Clade:	Pleistoannelida
Clade:	Sedentaria; Lamarck 1818
Orders and families
	Orbiniida; Cirratuliformia; Siboglinidae (=Pogonophora); Sabellida; Spionida; Opheliida; Capitellida Echiura; Capitellidae; ; Terebelliformia; Maldanomorpha; Clitellata "Oligochaetes"; Hirudinea; ; Incertae sedis ?Myzostomida; ?Spintheridae;

Sedentaria is a diverse clade of annelid worms. It is traditionally treated as a subclass of the paraphyletic class Polychaeta, but it is also a monophyletic group uniting several polychaetes and the monophyletic class Clitellata. It is the sister group of Errantia.^[1]

Phylogeny

The phylogeny of polychaetes is slowly being resolved. Sedentaria and Errantia are the two biggest clades of polychaetes, and together they compose clade Pleistoannelida. Sedentaria's most basal clade is Orbiniida.^[2] Other groups that are nested within Sedentaria are: Clitellata, the Sabellida/Spionida clade, Opheliida, Echiura, Cirratuliformia, Terebelliformia, Maldanomorpha and the families Siboglinidae and Capitellidae.^[3]^[1]^[4]

Pleistoannelida

Errantia

Sedentaria

Orbiniida

	Cirratuliformia

	Siboglinidae

	Sabellida

	Spionida

Opheliida

Capitellida

	Echiura

	Capitellidae

Terebelliformia

Maldanomorpha

	Maldanidae

	Arenicolidae

Clitellata

Some taxa, such as Spintheridae and Myzostomida, are still difficult to place due to their long branching, but they likely belong to either Errantia or Sedentaria.^[1]

References

^ ^a ^b ^c Weigert A, Bleidorn C (2016). "Current status of annelid phylogeny". Org Divers Evol. 16: 345–362. doi:10.1007/s13127-016-0265-7.
^ Struck TH, Golombek A, Weigert A, Franke FA, Westheide W, Purschke G, Bleidorn C, Halanych KM (3 August 2015). "The evolution of annelids reveals two adaptive routes to the interstitial realm". Curr Biol. 25 (15): 1993–1999. doi:10.1016/j.cub.2015.06.007. PMID 26212885.
^ Andrade, Sónia C.S.; Novo, Marta; Kawauchi, Gisele Y.; Worsaae, Katrine; Pleijel, Fredrik; Giribet, Gonzalo; Rouse, Greg W. (November 2015). "Articulating "Archiannelids": Phylogenomics and Annelid Relationships, with Emphasis on Meiofaunal Taxa". Molecular Biology and Evolution. 32 (11): 2860–2875. doi:10.1093/molbev/msv157.
^ Struck TH (2019). "Phylogeny". In Purschke G, Böggemann M, Westheide W (eds.). Handbook of Zoology: Annelida. Vol. 1: Annelida Basal Groups and Pleistoannelida, Sedentaria I. De Gruyter. doi:10.1515/9783110291582-002. ISBN 9783110291469.

[AnnelidCurrent-1] Weigert A, Bleidorn C (2016). "Current status of annelid phylogeny". Org Divers Evol. 16: 345–362. doi:10.1007/s13127-016-0265-7.

[Two_adaptive_routes_Annelida-2] Struck TH, Golombek A, Weigert A, Franke FA, Westheide W, Purschke G, Bleidorn C, Halanych KM (3 August 2015). "The evolution of annelids reveals two adaptive routes to the interstitial realm". Curr Biol. 25 (15): 1993–1999. doi:10.1016/j.cub.2015.06.007. PMID 26212885.

[Articulating_Archiannelids-3] Andrade, Sónia C.S.; Novo, Marta; Kawauchi, Gisele Y.; Worsaae, Katrine; Pleijel, Fredrik; Giribet, Gonzalo; Rouse, Greg W. (November 2015). "Articulating "Archiannelids": Phylogenomics and Annelid Relationships, with Emphasis on Meiofaunal Taxa". Molecular Biology and Evolution. 32 (11): 2860–2875. doi:10.1093/molbev/msv157.

[Handbook_Zoology_Annelida_1-4] Struck TH (2019). "Phylogeny". In Purschke G, Böggemann M, Westheide W (eds.). Handbook of Zoology: Annelida. Vol. 1: Annelida Basal Groups and Pleistoannelida, Sedentaria I. De Gruyter. doi:10.1515/9783110291582-002. ISBN 9783110291469.

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