Abstract The new genus Cieneguiticeras , assigned to the family Oppeliidae, is described on the basis of Andean lower-middle Tithonian ammonites from Arroyo Cieneguita, west-central part of the Neuquen-Mendoza Basin, Argentina. The macroconchs are closely homoeomorphic with Neochetoceras Spath and the microconchs have a ‘glochiceratid’-type morphology. The stratigraphic range of Cieneguiticeras nov. gen. includes the lower and middle Tithonian by means of a succession of two or three species which are interpreted as members of a phyletic lineage. Ammonites from the Tithonian of Cuba, Mexico and France are more or less confidently included in this new genus.

中文翻译：

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Cieneguiticeras，Tithonian oppeliids 的一个新属（Ammonoidea，晚侏罗纪）

摘要 归入 Oppeliidae 科的新属 Cieneguiticeras 是在阿根廷内乌肯-门多萨盆地中西部的 Arroyo Cieneguita 的安第斯中下提通阶菊石的基础上描述的。大海螺与 Neochetoceras Spath 密切同形，而微型海螺具有“glocicheratid”型形态。Cieneguiticeras nov. 的地层范围。将军 通过被解释为系统谱系成员的两个或三个物种的连续性，包括下提通阶和中提通阶。来自古巴、墨西哥和法国提通阶的菊石或多或少有把握地包含在这个新属中。