Sedentaria, Lamarck, 1818

Weigert, Anne & Bleidorn, Christoph, 2016, Current status of annelid phylogeny, Organisms Diversity & Evolution (New York, N. Y.) 16 (2), pp. 345-362 : 349

Sedentaria

The following taxa are assigned to Sedentaria based on Weigert et al. (2014): Clitellata, Pectinariidae , Alvinellidae, Te r e b e l l i d a e, A r e n i c o l i d a e, O p h e l i i d a e, E c h i u r a, Capitellidae , Spionidae , Sabellariidae , Serpulidae , Sabellidae , Siboglinidae , Acrocirridae , Flabelligeridae , C i r r a t u l i d a e, a n d O r b i n i i d a. M o r e o v e r, S p i n t h e r, Fauveliopsidae and Sternaspidae should be further included in Sedentaria according to Andrade et al. (2015). In general, relationships of Sedentaria are well-supported for most nodes and are consistent across analyses including different numbers of genes. Terebellomorpha (including Alvinellidae , A m p h a r e t i d a e, P e c t i n a r i d a e, Te r e b e l l i d a e, a n d Tr i c h o b r an c h i d a e) a n d C i r r a t u l i f o r m i a (i n c l u d i n g Acrocirridae , Cirratulidae , Ctenodrilidae , Fauveliopsidae , Flabelligeridae , and Sternapsidae) appear monophyletic, even though not all members were included, yet. A clade of Terebellida comprising all these taxa ( Rouse and Fauchald 1997) could not be recovered. Terebellomorpha are more closely related to Clitellata and Cirratuliformia cluster with Siboglinidae . The taxa Sabellaridae, Serpulidae , Sabellidae , Siboglinidae , and Oweniidae , which were formerly combined in a clade called Sabellida ( Rouse and Fauchald 1997) are now dispersed throughout the tree: Oweniidae are part of the basal radiation, Siboglinidae group with Cirratuliformia and Orbiniidae and Sabellariidae are more closely related to Spionidae than to Sabellidae and Serpulidae ( Weigert et al. 2014) . The Orbiniidae , which were regarded as intermediate forms of errant and sedentary living polychaetes ( Fauvel 1927) or part of Errantia ( Struck et al. 2011) are firmly placed within Sedentaria. However, the definite position either as sister group to all remaining Sedentaria or to Siboglinidae together with Cirratuliformia depends on the number of characters and the taxon sampling used in phylogenomic analyses and therefore still an open question ( Weigert et al. 2014; Struck et al. 2015). For the following families, an affiliation to Sedentaria is likely as they consistently grouped with sedentarian taxa in analyses based on a single or few genes ( Struck et al. 2007; Struck et al. 2008): Trichobranchidae (Terebellomorpha) , Maldanidae , and Trochochaetidae .