Annulonemertes (phylum Nemertea): when segments do not count

We estimated the phylogenetic position of the pseudosegmented ribbon worm Annulonemertes minusculus to test proposed evolutionary hypotheses to explain these body constrictions. The analysis is based on 18S rDNA sequences and shows that the species belongs to an apomorphic clade of hoplonemertean sp...

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Detalles Bibliográficos
Autores principales: Sundberg, Per, Strand, Malin
Formato: Texto
Lenguaje:English
Publicado: The Royal Society 2007
Materias:
Research Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1975765/
https://www.ncbi.nlm.nih.gov/pubmed/17686756
http://dx.doi.org/10.1098/rsbl.2007.0306
Descripción
Sumario:We estimated the phylogenetic position of the pseudosegmented ribbon worm Annulonemertes minusculus to test proposed evolutionary hypotheses to explain these body constrictions. The analysis is based on 18S rDNA sequences and shows that the species belongs to an apomorphic clade of hoplonemertean species. The segmentation has no phylogenetic bearing as previously discussed, but is a derived character probably coupled to the species' interstitial habitat.

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