Paläontologisches Institut und Museum, Universität Zürich, Zürich, Switzerland.
Facultad de Ciencias Naturales, Grupo de Paleontología Neotropical Tradicional y Molecular (PaleoNeo), Universidad del Rosario, Bogotá, Colombia.
PeerJ. 2022 Jun 2;10:e13496. doi: 10.7717/peerj.13496. eCollection 2022.
The vertebrate marine faunas that inhabited northern South America during the Cretaceous are still poorly known. This study is a contribution to a growing wave of new studies on Lower Cretaceous vertebrates from Colombia. Here we report and describe a new species of a hybodontiform shark of the genus , which we named sp. nov., based on isolated teeth, that were collected in Valanginian-Hauterivian rocks of the Rosa Blanca Formation (Carrizal and El Sapo Members) near the town of Zapatoca, Santander Department, Andes of Colombia. In addition, we describe two other fragmented teeth assigned to sp. from the Rosa Blanca Fm. The new species from Colombia represents the only Cretaceous record of from Gondwana, offering new insights into the paleogeographic distribution of the genus, as well as increasing the knowledge about the scarce hybodontiform paleodiversity known from South America. The presence of in the Rosa Blanca Formation suggests that these durophagous (shell-crushing) fishes played an important role as predators of the abundant and diverse invertebrate fauna present in these ancient tropical coastal ecosystems of Gondwana.
生活在白垩纪时期的北南美洲的脊椎动物海洋动物群仍然知之甚少。本研究是对哥伦比亚下白垩统脊椎动物日益增多的新研究的贡献。在这里，我们根据在哥伦比亚安第斯山脉的萨波托卡镇附近的罗萨布兰卡组（卡利萨尔和埃尔萨波组）的瓦朗西纳期-豪特里维期岩石中收集的孤立牙齿，报告并描述了一种被命名为 的异齿鲛属的新鲨鱼物种，。此外，我们还描述了罗萨布兰卡组中另外两个属于 的破碎牙齿。来自哥伦比亚的新物种代表了冈瓦纳唯一的白垩纪时期的记录，为该属的古地理分布提供了新的见解，并增加了对南美已知的稀有异齿鲛古生物多样性的了解。在罗萨布兰卡组中发现表明这些食硬骨鱼（粉碎贝壳的鱼类）在这些冈瓦纳古老的热带沿海生态系统中作为丰富多样的无脊椎动物群的捕食者发挥了重要作用。
