Scutopus is considerate enough to have a pretty typical molluscan mitochondrial genome organization and it is not an especially long branch. I was very impressed by the mitochondrial gene trees, which largely agree with the 2011 duelling Nature mollusc phylogenomics papers. When I've tried to make mollusc mt genome trees before they've turned out pretty wacky (but it seems the authors wisely avoided some of the more long-branched taxa). They also conducted analyses including nuclear ribosomal proteins from a diverse sampling of molluscs both with and without the mitochondrial data and found support for Aculifera and Aplacophora (albeit with weak support in some analyses).
Scutopus is actually the second aplacophoran mitochondrial genome that is publicly available. The mitochondrial genome of Chaetoderma nitidulum is also available on NCBI but it was never published.
Link to the paper:
http://www.biomedcentral.com/1471-2148/14/197/
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| Scutopus ventrolineatus (photo by Christiane Todt) |
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