ABSTRACT

The Upper Cretaceous record of lungfishes from South America is abundant but represented mainly by tooth plates and associated jaw bones. A new dipnoan species from the Upper Cretaceous of the La Colonia Formation, Chubut Province, Argentina, is described here. Metaceratodus baibianorum, sp. nov., is diagnosed by a combination of features (tooth plates from medium to large size, inner angles located at the second cleft in upper tooth plates and at the second ridge in lower ones). Previously, some material of Metaceratodus baibianorum was referred to Metaceratodus wichmanni. However, by applying morphogeometric studies and a statistical analysis to compare means of independent samples, we conclude that Metaceratodus baibianorum, sp. nov., differs from the other species of similar age in Patagonia.

摘要

来自南美的上白垩纪肺鱼的记录丰富，但主要以牙板和相关的颚骨为代表。这里描述了来自阿根廷丘布特省拉科洛尼亚组上白垩统的一种新的地皮动物物种。Metaceratodus baibianorum，SP。nov。，可通过多种特征（齿板从中型到大型，内角位于上齿板的第二个裂口和位于下齿形的第二个脊处）进行诊断。以前，一些材料Metaceratodus baibianorum被称为Metaceratodus wichmanni。但是，通过应用形态几何学研究和统计分析来比较独立样本的平均值，我们得出结论：白斑病菌，sp。11月，与巴塔哥尼亚其他类似年龄的物种不同。