The North Pacific distribution of coastal staphylinids may be explained as the result of either dispersal or vicariance. The intertidal rove beetle genus Diaulota is a submarine group that occurs on the Pacific coasts of the Northern Hemisphere. We performed a phylogenetic analysis of Diaulota using molecular characters (3241 bp) to investigate their biogeographic history and patterns. The data were analysed by parsimony, Bayesian, and maximum likelihood methods. Model-based analyses showed the same pattern of Diaulota species relationships, but parsimony analysis resulted in different species relationships for the unresolved clade B. Biogeographical analyses suggested that the common ancestor of Diaulota occurred widely along the East Asian coast with repeated dispersal to the north-eastern Pacific from the north-western Pacific. According to the reconstruction of the ancestral areas, both dispersal (seven events) and vicariance (four events) were important in shaping its current distribution. Although most species underwent stepwise colonization from East Asia via Kamchatka and Alaska to North America along the coast, a single lineage (Diaulota fulviventris and Diaulota harteri) crossed the Pacific Ocean directly from the north-western Pacific to the north-eastern Pacific, possibly via sea surface currents.

中文翻译：

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不会飞的甲虫穿越太平洋：潮间带 Diaulota Casey 属的系统发育和生物地理学（鞘翅目：Staphylinidae：Aleocharinae）

北太平洋沿岸葡萄球菌的分布可以解释为扩散或替代的结果。潮间带甲虫属 Diaulota 是一个生活在北半球太平洋沿岸的海底类群。我们利用分子特征 (3241 bp) 对 Diaulota 进行了系统发育分析，以研究其生物地理历史和模式。通过简约法、贝叶斯法和最大似然法对数据进行分析。基于模型的分析表明 Diaulota 物种关系模式相同，但简约分析导致未解决的分支 B 存在不同的物种关系。生物地理学分析表明 Diaulota 的共同祖先广泛分布在东亚海岸，并反复向北扩散。从西北太平洋到东太平洋。根据对祖先地区的重建，分散（七个事件）和替代（四个事件）对于形成其当前的分布都很重要。尽管大多数物种经历了从东亚经堪察加半岛和阿拉斯加沿海到北美的逐步殖民化，但有一个谱系（Diaulota fulviventris 和 Diaulota harteri）直接从西北太平洋穿越太平洋到达东北太平洋，可能是通过海面洋流。