Gastropod shells may present large spines and sharp shapes that vary according to environmental, taxonomic, and evolutionary factors. In these cases, classic morphometric methods used to study shell contour might not provide a clear representation of morphological shell based on angular decomposition of contour. The present study analyzed and compared for the first time the robustness of the contour analysis using wavelet transformed and Elliptic Fourier descriptors for gastropod shells including enlarged spines. For that, we analyzed two geographical and ecological separated populations of Bolinus brandaris from the NW Mediterranean Sea. Results showed that contour analysis of gastropod shells with enlarged spines can be analyzed using both methodologies, but the wavelet analysis provided a better local discrimination. From an ecological perspective, shells with spines of different sizes were observed in both localities suggesting a wide plasticity of the species.

中文翻译：

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识别具有扩大刺的软体动物壳轮廓：小波与椭圆傅立叶分析

腹足动物壳可能呈现出大刺和锋利的形状，这些形状因环境、分类学和进化因素而异。在这些情况下，用于研究壳轮廓的经典形态测量方法可能无法提供基于轮廓角度分解的形态壳的清晰表示。本研究首次分析和比较了使用小波变换和椭圆傅里叶描述符对腹足动物壳（包括扩大的刺）进行轮廓分析的稳健性。为此，我们分析了来自西北地中海的 Bolinus brandaris 的两个地理和生态分离种群。结果表明，可以使用两种方法分析具有增大的刺的腹足动物壳的轮廓分析，但是小波分析提供了更好的局部区分。