An updated 18S rRNA phylogeny of tunicates based on mixture and secondary structure models.

ABSTRACT:

Background

Tunicates have been recently revealed to be the closest living relatives of vertebrates. Yet, with more than 2500 described species, details of their evolutionary history are still obscure. From a molecular point of view, tunicate phylogenetic relationships have been mostly studied based on analyses of 18S rRNA sequences, which indicate several major clades at odds with the traditional class-level arrangements. Nonetheless, substantial uncertainty remains about the phylogenetic relationships and taxonomic status of key groups such as the Aplousobranchia, Appendicularia, and Thaliacea.

Results

Thirty new complete 18S rRNA sequences were acquired from previously unsampled tunicate species, with special focus on groups presenting high evolutionary rate. The updated 1

SUBMITTER: Tsagkogeorga G 

PROVIDER: S-EPMC2739199 | biostudies-literature | 2009 Aug

REPOSITORIES: biostudies-literature