Cryptic genetic divergence and associated morphological differentiation in the arboreal land snail Satsuma (Luchuhadra) largillierti (Camaenidae) endemic to the Ryukyu Archipelago, Japan
Cryptic genetic divergence and associated morphological differentiation in the arboreal land snail Satsuma (Luchuhadra) largillierti (Camaenidae) endemic to the Ryukyu Archipelago, Japan
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DOI：
10.1016/j.ympev.2007.03.021
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发表时间：
2007-11-01
影响因子：
4.1
通讯作者：
Kato, Makoto
中科院分区：
文献类型：
--
作者：
Kameda, Yuichi;Kawakita, Atsushi;Kato, Makoto
陆生蜗牛是进化生态学中著名的模式生物，但广泛的形态变异和缺乏现成的诊断特征往往会导致近缘物种之间的分类混乱。日本小温州螺（Satsuma（Luchuhadra）largillierti）是日本冲绳特有的一种陆生树栖蜗牛，其壳形态的广泛地理变异长期以来造成分类复杂化。建立了S. largillierti及其盟友，我们进行分子和形态学分析的蜗牛样本从整个范围的Luchuhadra。线粒体细胞色素氧化酶亚基I基因和核核糖体内转录间隔区序列的分析划分S。largillierti分为两个，生殖隔离组。这些群体中的每一个都分别包括Satsuma erabuensis和Satsuma sooi，它们出现在附近的岛屿上，传统上被认为是不同的物种。外生殖器的形态测量分析进一步提供了两组之间的明显差异，而壳形态的差异很小。这些结果表明，传统的分类过度依赖于不充分的形态差异和岛屿地理的先验信息，这导致了过度简单化的复杂的物种形成历史的Luchuhadra。(C)2007爱思唯尔公司All rights reserved.
Land snails are renowned model organisms in evolutionary ecology, but extensive morphological variation and lack of readily available diagnostic characters often invite taxonomic confusion among closely related species. Satsuma (Luchuhadra) largillierti is an arboreal land snail endemic to Okinawa Island, Japan, in which extensive geographic variation in shell morphology has long caused taxonomic complication. To establish robust species limits among S. largillierti and its allies, we perform molecular and morphological analyses of snails sampled from the entire range of Luchuhadra. Analyses of the mitochondrial cytochrome oxidase subunit I gene and nuclear ribosomal internal transcribed spacer sequences divide S. largillierti into two, reproductively isolated groups. Each of these groups includes Satsuma erabuensis and Satsuma sooi, respectively, which occur on a nearby island and were traditionally regarded as distinct species. Morphometric analysis of the genitalia further provides clear difference between the two groups, whereas differentiation in shell morphology is slight if any. These results indicate that the traditional taxonomy has overly depended on inadequate morphological difference and a priori information of island geography, which resulted in oversimplification of complex speciation history in Luchuhadra. (C) 2007 Elsevier Inc. All rights reserved.