Phragmolites lissoni new species is described from 11 specimens found in the Sandbian Calapuja Formation near Calapuja in Peru. The deposits are part of the Central Andean Basin. This is the hitherto only systematically described Ordovician gastropod from Peru. The species is from a brachiopod-dominated siliciclastic sequence and is associated with bryozoans. Most specimens are preserved as external molds, but latex casts yield excellent details of shell ornamentation and are used as a basis for evaluating this feature in the genus. The characteristic ornamentation of Phragmolites should be called corrugated lamellae, and the individual elements on these should be referred to as flutes. A descriptive terminology for these is suggested. The development and shape of the corrugated lamellae and flutes could be biomechanical process. A second component in lamellar formation is the alternation between regular incremental growth and formation of a lamella. Phragmolites is mainly found in shallow-water carbonate facies from tropical latitudes in the Sandbian and a mid-latitude presence in Peru is unexpected. Brachiopods from the same section in Calapuja show affinities with faunas of the Mediterranean margin of Gondwana but also weak links with Avalonia. Phragmolites is found abundantly in deeper-water facies in Laurentia, and a broad tolerance to facies and temperature and possible planktotrophy might have allowed a wide geographical dispersal of the genus. The scant record of Ordovician gastropods in the Central Andean Basin precludes comparison with the disparate record of the Ordovician gastropod taxa from the Precordillera, which do not include Phragmolites.UUID: http://zoobank.org/References/fbd7a43e-a610-42fd-a31d-b1a16fa69c9b

中文翻译：

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来自秘鲁高原晚奥陶世的芦苇（腹足纲）

芦苇在秘鲁 Calapuja 附近的 Sandbian Calapuja 组发现的 11 个标本中描述了新物种。这些矿床是安第斯中部盆地的一部分。这是迄今为止唯一系统描述的来自秘鲁的奥陶纪腹足动物。该物种来自以腕足类动物为主的硅质碎屑序列，与苔藓虫有关。大多数标本作为外部模具保存，但乳胶铸件产生出色的外壳装饰细节，并被用作评估该属中这一特征的基础。特色纹饰芦苇应该被称为波纹薄片，而这些薄片上的单个元件应该被称为凹槽。建议使用描述性术语。波纹薄片和凹槽的发展和形状可能是生物力学过程。层状形成的第二个组成部分是规则增量生长和层状形成之间的交替。芦苇主要在桑边热带纬度的浅水碳酸盐相中发现，在秘鲁中纬度的存在是出乎意料的。来自 Calapuja 同一区域的腕足类动物与冈瓦纳地中海边缘的动物群有亲缘关系，但与 Avalonia 的联系也很薄弱。芦苇在 Laurentia 的深水相中大量发现，并且对相和温度的广泛耐受性以及可能的浮游营养可能允许该属的广泛地理分布。中部安第斯盆地奥陶纪腹足类动物的记录很少，因此无法与来自前记录列的奥陶纪腹足类动物分类群的不同记录进行比较，后者不包括芦苇。UUID：http://zoobank.org/References/fbd7a43e-a610-42fd-a31d-b1a16fa69c9b