Systematic, Biogeography, and Evolution of Terrestriality in the Geomelaniinae (Gastropoda, Rissoacea, Truncatellidae)

9408089 ROSENBERG该项目将利用内部解剖学和等位酶电泳的信息来确定西印度群岛主要岛屿上一个属中大约25种陆生蜗牛之间的关系。 这些非常有趣的蜗牛是陆生的，但它们的近亲是两栖动物。 该项目将调查这种向陆地居住的过渡是否已经完成，然后蜗牛分散到其他岛屿，或者是否有多次陆地入侵，每个岛屿都是从两栖祖先单独殖民的。 该项目将有助于我们了解这些限制岛屿动物群的生物多样性。 蜗牛是一个很好的模型系统，用于研究向陆地上存在的过渡以及显著的变化，特别是呼吸系统的变化，这些变化必须伴随着如此重大的栖息地转移。 有关岛屿地质历史的信息也应该出现，因为蜗牛关系的模式应该反映岛屿的关系或相对起源时间。 ***

9408089 ROSENBERG This project will utilize information from internal anatomy and allozyme electrophoresis to determine relationships among approximately 25 species of land snails in a genus which occurs on major islands in the West Indies. These very interesting snails are terrestrial but their closest relatives have an amphibian existence. The project will investigate whether this transition to land-dwelling has been made once, with the snails then dispersing to other islands, or whether there have been, instead, multiple land invasions with each island having been colonized separately from an amphibious ancestor. %%% This project will contribute to our knowledge of biodiversity in these restricted island faunas. The snails are an excellent model system for investigating the transition to an existence on land and the marked changes, especially in the respiratory system, that must occur with such a major habitat shift. Information about the geologic history of the islands should also emerge as patterns in relationships of the snails should reflect relationships or relative times of origin for the islands. ***