Abstract We applied morphometric analyses performed with a polarizing light microscope on a total of 100 specimens of Carinolithus superbus and C. magharensis to clarify the taxonomy based on measurements of total height (TH), stem height (SH), stem width (SW), proximal shield width (PS), distal shield width (DS) and thickness of the distal shield (TDS). Statistical analyses showed that three of these parameters, namely the DS, TDS and SW, are diagnostic for taxa discrimination. New taxa include C. superbus subsp. crassus subsp. nov. and C. magharensis subsp. minor subsp. nov. Specimens of C. cantaluppii were qualitatively investigated to assess the potential role of secondary modifications and our results revealed that, indeed, C. cantaluppii is a diagenetic artefact due to different degrees of overgrowth on specimens of C. poulnabronei, C. superbus subsp. crassus, C. superbus subsp. superbus, C. magharensis subsp. minor and C. magharensis subsp. magharensis. This implies that C. cantaluppii is not a true taxon, and the overgrowth phase of Carinolithus specimens is an effective proxy to assess the diagenetic degree. The morphometry-based revised taxonomy of the genus Carinolithus was applied to improve the biostratigraphic resolution of the Toarcian-Aalenian interval, with further implications for the reconstruction of evolutionary trends.

中文翻译：

---

基于形态测量分析和成岩作用观察的 Carinolithus 属（早-中侏罗世）的分类学修订：对生物地层学和进化趋势的影响。

摘要 我们使用偏光显微镜对 Carinolithus superbus 和 C. magharensis 的 100 个标本进行形态测量分析，以根据总高度 (TH)、茎高 (SH)、茎宽 (SW)、近端屏蔽宽度 (PS)、远端屏蔽宽度 (DS) 和远端屏蔽厚度 (TDS)。统计分析表明，这些参数中的三个，即 DS、TDS 和 SW，可以诊断分类群的区分。新分类群包括 C. superbus subsp。克拉苏亚种 十一月 和 C. magharensis subsp。次要亚种 十一月 对 C. cantaluppii 的标本进行了定性研究以评估二次修饰的潜在作用，我们的结果表明，C. cantaluppii 实际上是一种成岩人工制品，因为 C. poulnabronei、C. 超级巴士亚种 crassus, C. superbus subsp. superbus, C. magharensis subsp. 次要和 C. magharensis subsp。马哈拉西斯 这意味着 C. cantaluppii 不是真正的分类群，Carinolithus 标本的过度生长阶段是评估成岩程度的有效代表。应用基于形态测量学的 Carinolithus 属的修订分类法来提高 Toarcian-Aalenian 区间的生物地层分辨率，并进一步影响进化趋势的重建。