Tree snails in the family Partulidae are widespread across the tropical Pacific, with endemic species occurring on most high islands. Partulid species have faced catastrophic range reductions and extinctions due primarily to introduced predators. Consequently, most extant species are threatened with imminent extinction. The U.S. administered Mariana Islands, consisting of Guam in the South and the Commonwealth of the Northern Mariana Islands (CNMI) in the north, historically harbored six endemic partulid species, half of which are thought to be extinct. While conducting a phylogenetic assessment of Partula gibba, an extant tree-snail with a range spanning at least seven islands within the archipelago, it was discovered that what has been identified as P. gibba on the island of Rota is a misidentified cryptic species. Here we use molecular phylogenetics, shell morphometrics and reproductive anatomy to describe it as a new species, Partula lutaensissp. nov.. Because the new species has suffered population declines and has a restricted range, consisting solely of the small island of Rota, we highlight the urgent need for conservation measures.

中文翻译：

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北马里亚纳群岛罗塔岛上的树蜗牛长久以来被称为Partula gibba（Partulidae），是一种不同的物种。

ul属中的树蜗牛遍布整个热带太平洋，在大多数高岛上都有特有种。食虫物种主要由于引入掠食性动物而面临着灾难性的范围缩小和灭绝。因此，大多数现存物种面临灭绝的威胁。美国管理的马里亚纳群岛由南部的关岛和北部的北马里亚纳群岛联邦（CNMI）组成，历史上藏有6种特有的特有物种，其中一半被认为已灭绝。在对分布在阿根廷群岛上至少七个岛上的现存树蜗牛Partula gibba进行系统发育评估时，发现在Rota岛上被鉴定为P. gibba的是一种误认的隐性物种。在这里，我们使用分子系统发育学，壳形态学和生殖解剖学将其描述为一种新物种Partula lutaensissp。nov ..由于新物种的种群减少且范围有限，仅由小岛罗塔岛组成，因此我们强调迫切需要采取保护措施。