Current status of annelid phylogeny
- PDF / 1,684,215 Bytes
- 18 Pages / 595.276 x 790.866 pts Page_size
- 22 Downloads / 241 Views
REVIEW
Current status of annelid phylogeny Anne Weigert 1 & Christoph Bleidorn 1,2
Received: 27 August 2015 / Accepted: 16 January 2016 # Gesellschaft für Biologische Systematik 2016
Abstract Annelida is an ecologically and morphologically diverse phylum within the Lophotrochozoa whose members occupy a wide range of environments and show diverse life styles. The phylogeny of this group comprising more than 17, 000 species remained controversial for a long time. By using next-generation sequencing and phylogenomic analyses of huge data matrices, it was finally possible to reach a wellsupported and resolved annelid backbone tree. Most annelid diversity is comprised in two reciprocal monophyletic groups, Sedentaria and Errantia, which are named after the predominant life style of their members. Errantia include Aciculata (Phyllodocida + Eunicida) and Protodriliformia, which is a taxon of interstitial polychaetes. Sedentaria comprise most of the polychaete families formerly classified as Canalipalpata or Scolecida, as well as the Clitellata. Six taxa branch as a basal grade outside of this major radiation: Oweniidae, Magelonidae, Chaetopteridae, Sipuncula, Amphinomida, and Lobatocerebrum. Oweniidae and Magelonidae form a monophyletic group which we name Palaeoannelida, which constitutes the sister taxon of the remaining annelids. The early splits of annelid phylogeny date back to the Cambrian. The new annelid phylogeny highlights the variability and lability of annelid body plans, and many instances of This article is part of the Special Issue. The new animal phylogeny: The first 20 years * Anne Weigert [email protected]
1
Molecular Evolution and Animal Systematics, University of Leipzig, Talstr. 33, 04103 Leipzig, Germany
2
German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Deutscher Platz 5e, 04103 Leipzig, Germany
simplifications of body plan as adaptations to new life styles can be found. Therefore, annelids will be an appropriate model to understand major transitions in the evolution of Bilateria in general. Evolutionary developmental studies are one way to investigate macroevolutionary transition in annelids. We briefly summarize the state of developmental model organisms in Annelida and also propose new candidates on the background of the phylogeny. Keywords Annelida . Evo-devo . Evolution . Model organism . Phylogenomics . Polychaeta
Annelid phylogeny—a historical perspective Annelida, commonly referred to as segmented or ringed worms, is an ecologically diverse phylum within the Lophotrochozoa whose members occupy a wide range of environments including terrestrial, limnic, and marine habitats (Rouse and Pleijel 2001; Aguado et al. 2014). Several species are highly specialized to distinct ecological niches such as intertidal and pelagic zones or hydrothermal vents. In addition, annelids exhibit a huge diversity of body and larval forms, life modes, and feeding strategies and possess true segmentation, which is otherwise found only in Arthropoda and Chordata (Seaver
Data Loading...
