Insects are usually considered to be excluded from the marine environment. A small number of species, however, are considered to be marine, due to spending some portion of their life cycle in salt water. We use natural history collection specimens, in-field observations, and molecular analysis to generate new locale records and natural history data for seven insect species. All seven species are associated with barnacles (Balanomorpha: Balanidae, Chthamalidae) along the Pacific coast of Canada, the United States of America, or Japan. Use of DNA barcode analysis confirms the monophyly of three species of Oedoparena (Diptera: Dryomyzidae). Natural history collection specimens expand the geographical range and illuminate the phenology of Oedoparena spp. In-field observations record direct associations between three species of Thalassosmittia (Diptera: Chironomidae), Diaulota densissima (Casey) (Coleoptera: Staphylinidae), and intertidal barnacles from various locations in British Columbia, Canada. Barnacle host associations and microhabitat preferences are proposed for all species. A new definition of what constitutes a marine insect is offered.

通常认为昆虫被排除在海洋环境之外。但是，由于将其生命周期的一部分花费在盐水中，少数物种被认为是海洋物种。我们使用自然历史采集标本，现场观察和分子分析来生成新的场所记录和7种昆虫的自然历史数据。所有这七个物种与加拿大，美国或日本的太平洋沿岸的藤壶（Balanomorpha：Balanidae，Chthamalidae）有关。DNA条码分析的使用确认了三种Oedoparena（双翅目：Dryomyzidae）的单性。自然史收集标本扩大了地理范围并阐明了Oedoparena的物候spp。三个品种之间的现场观测记录直接关联Thalassosmittia（：双翅目摇），Diaulota densissima从加拿大不列颠哥伦比亚省的各个位置，和潮间带藤壶：（凯西）（隐翅虫鞘翅目）。提出了针对所有物种的藤壶宿主关联和微生境偏好。提供了有关构成海洋昆虫的新定义。