Rowson B, Warren B H, Ngereza C F
Zookeys. 2010 Nov 29(70):1-39. doi: 10.3897/zookeys.70.762.
Pemba is thought to have had a longer and/or stronger history of isolation than its better-known counterpart, Unguja. The extent to which the biota support this hypothesis of greater oceanicity have been debated. Here, Pemba's terrestrial mollusc ("land-snail") fauna is surveyed and reviewed for the first time. We find at best equivocal evidence for the following hallmarks of greater oceanicity: impoverishment, imbalance, and a high rate of endemism. At least 49 species are present, families are represented in typical proportions, and there are only between two and four island-endemic species - i.e. a 4% to 8% rate of endemism. For land-snails, isolation thus seems to have been short (Pleistocene) or, if longer, weak. Nevertheless, Pemba does host endemic and globally rare species. Forty-five percent of the species found, including most of these, is restricted to forest reserves, with Ngezi Forest Reserve particularly rich. A further 45% are able to tolerate the island's woody cultivated habitats. One new snail species (Cyclophoridae: Cyathopoma) and one new slug species (Urocyclidae: Dendrolimax pro tem.) are described. New data and illustrations are provided for other taxa.
奔巴岛被认为比其更为著名的姊妹岛昂儒昂岛有着更悠久和/或更强烈的隔离历史。生物群在多大程度上支持这种更大海洋性的假说一直存在争议。在此，首次对奔巴岛的陆生软体动物（“陆地蜗牛”）动物群进行了调查和综述。我们发现，关于更大海洋性的以下特征，至多只有模棱两可的证据：物种贫乏、不平衡以及高特有率。至少有49个物种存在，各家族以典型比例呈现，只有两到四个岛屿特有物种，即特有率为4%至8%。因此，对于陆地蜗牛来说，隔离似乎时间较短（更新世），或者即便时间更长，隔离程度也较弱。尽管如此，奔巴岛确实拥有特有且全球罕见的物种。所发现的物种中有45%，包括其中大部分，仅限于森林保护区，恩盖齐森林保护区尤为丰富。另有45%能够耐受该岛的木本耕种栖息地。描述了一种新的蜗牛物种（环口螺科：Cyathopoma）和一种新的蛞蝓物种（尾嵴蛞蝓科：暂定为Dendrolimax）。还提供了其他分类群的新数据和插图。
