Atmosphere and Ocean Research Institute, University of Tokyo, Kashiwa, Chiba 277-8564, Japan.
Mol Phylogenet Evol. 2013 Apr;67(1):9-14. doi: 10.1016/j.ympev.2012.12.018. Epub 2013 Jan 8.
Barnacles of the superfamily Coronuloidea are obligate epibionts of various marine mammals, marine reptiles and large crustaceans. We used five molecular markers: 12S rDNA, 16S rDNA, 18S rDNA, 28S rDNA and Histone 3 to infer phylogenetic relationships among sixteen coronuloids, representing most of the recent genera of barnacles of this superfamily. Our analyses confirm the monophyly of Coronuloidea and that this superfamily and Tetraclitoidea are sister groups. The six-plated Austrobalanus clusters with these two superfamilies. Based on BEAST and ML trees, Austrobalanus is basal and sister to the Coronuloidea, but the NJ tree places Austrobalanus within the Tetraclitoidae, and in the MP tree it is sister to both Coronuloidea and Tetraclitoidae. Hence the position of Austrobalanus remains unresolved. Within the Coronuloidea we identified four clades. Chelonibia occupies a basal position within the Coronuloidea which is in agreement with previous studies. The grouping of the other clades does not conform to previous studies. Divergence time analyses show that some of the time estimates are congruent with the fossil record while some others are older, suggesting the possibility of gaps in the fossil record.
藤壶超科的藤壶是各种海洋哺乳动物、海洋爬行动物和大型甲壳类动物的专性外寄生生物。我们使用了五个分子标记：12S rDNA、16S rDNA、18S rDNA、28S rDNA 和组蛋白 3，以推断 16 种藤壶（代表了该超科的大多数现代属）之间的系统发育关系。我们的分析证实了藤壶超科的单系性，并且该超科和 Tetraclitoidea 是姐妹群。六板 Austrobalanus 与这两个超科聚类在一起。基于 BEAST 和 ML 树，Austrobalanus 是基础的，与藤壶超科是姐妹群，但 NJ 树将 Austrobalanus 置于 Tetraclitoidae 内，在 MP 树中，它是藤壶超科和 Tetraclitoidae 的姐妹群。因此，Austrobalanus 的位置仍然没有解决。在藤壶超科中，我们确定了四个分支。Chelonibia 在藤壶超科中占据基础位置，这与之前的研究一致。其他分支的分组与之前的研究不一致。分歧时间分析表明，一些时间估计与化石记录一致，而另一些则更早，这表明化石记录中可能存在空白。
