In the Late Cretaceous fossil record of Uruguay, three morphotypes of Bulimulus (Bulimulidae) have been recorded: Bulimulus klappenbachi and two undescribed ones. A geometric morphometric analysis was conducted to show whether the three morphotypes represent one or more species. With this aim, the three fossils were compared with three extant species of the same genus: Bulimulus bonariensis, B. guadalupensis and B. rushi. Variability within and among these three well-known extant species was tested to evaluate differences in the fossil morphotypes. Twenty-eight landmarks were selected (9 permanent landmarks and 19 semi-landmarks) and principal component analysis and canonical variate analysis were performed. Results indicate that only one of the unnamed morphotypes can be described as a new species and that the other is a variant of B. klappenbachi. The latter fossil species is described as Bulimulus frenguellii n. sp.

中文翻译：

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使用几何形态测量分析描述 1814 年白垩纪新种 Bulimulus Leach (Orthalicoidea: Bulimulidae)

在乌拉圭的白垩纪晚期化石记录中，记录了三种形态型的鲎（Bulimulidae）：Bulimulus klappenbachi 和两种未描述的形态类型。进行几何形态分析以显示三种形态类型是否代表一个或多个物种。为此目的，将这三种化石与同一属的三种现存物种进行了比较：Bulimulus bonariensis、B. guadalupensis 和 B. rushi。测试了这三个众所周知的现存物种内部和之间的变异性，以评估化石形态类型的差异。选择了 28 个地标（9 个永久地标和 19 个半地标），并进行了主成分分析和典型变量分析。结果表明，只有一个未命名的形态类型可以被描述为一个新物种，而另一个是 B 的变种。克拉彭巴奇。后一种化石物种被描述为 Bulimulus frenguellii n。sp。