Figure 1.

Phylogenetic position of Hydra. A) The phylogenetic tree of opisthokonts was drawn according to [12,13]. Together with ctenophores, cnidarians form the Coelenterate superphylum. Coelenterates together with bilaterians constitute Eumetazoa, whereas porifers (sponges) occupy a sister group position within Metazoa. Dates are expressed in million years (my) according to [14]. LCA: Last Common Ancestor. B) Anatomy of the adult Hydra polyp. Scale bar: 400 μm. C) Phylogenetic tree of the various Hydra species drawn according to [15,16]. Genome-predicted transcriptomes are available from H. magnipapillata (Hm) [3], a RNAseq-454 transcriptome was produced from H. vulgaris AEP (AEP) [11] and this study presents a RNAseq Illumina-454 transcriptome from H. vulgaris Basel (Hv).

Wenger and Galliot BMC Genomics 2013 14:204   doi:10.1186/1471-2164-14-204
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