Combining target DNA enrichment and morphology to understand the evolution of Dexiarchia (Nudibranchia, Heterobranchia, Gastropoda, Mollusca)

异枝腹足动物（软体动物），主要由陆生动物组成，但也有许多不同的海洋分类群，包括最大的海洋类群，裸鳃动物，至少有4000种。在裸鳃亚纲中，一般可以区分出两个单系亚纲：Euctenidiacea （= anthbranchia）和Dexiarchia （Cladobranchia + Doridoxa）。德克夏亚纲包括至少2000种，还有许多其他物种尚未被描述。目前，共有34个科，近100个属。目前还没有包含所有主要家族的Dexiarchia的系统发育分析，也没有证实这个群体内部的关系。我们希望通过利用已经提取的DNA和保存的材料来研究这个长期存在的问题，以富集单拷贝蛋白质编码基因的目标DNA，并将结果与形态学分析相结合。由此产生的系统发育假说将为研究这一具有非凡生物现象的高度多样化群体的进化奠定基础。这将是第一次将分子标记和形态特征这两种技术结合起来，以帮助解决我们目前对海洋异枝进化的理解中的一些不一致之处。

Heterobranch Gastropoda (Mollusca), comprise a heterogeneous group of predominantly terrestrial forms (Pulmonata), but also with many different marine taxa, including the biggest marine group, the Nudibranchia, with at least 4,000 species. Within the Nudibranchia, two monophyletic subtaxa are generally distinguished: Euctenidiacea (= Anthobranchia) and Dexiarchia (Cladobranchia + Doridoxa). Dexiarchia comprises at least 2,000 species with many additional species still undescribed. Currently, 34 families with nearly 100 different genera are recognized. There exist no phylogenetic analyses of Dexiarchia that comprises all major families and corroborates relationships within this group. We want to investigate this long standing problem by exploiting already extracted DNA and preserved material for target DNA enrichment of single-copy protein-coding genes and combining the results with morphological analyses. Resulting phylogenetic hypotheses will form the base for the investigation of the evolution of this highly diverse group with extraordinary biological phenomena. It will be the first time that both techniques - molecular markers and morphological features - will be combined to help resolving some of the incongruences in our current understanding of marine heterobranch evolution.