Abstract This contribution presents the first results of an ongoing systematic revision of the coral fauna of the Agrio Formation (upper Valanginian–upper Hauterivian) of the Neuquen Basin, west-central Argentina. Actinastraeid corals (superfamily Actinastraeoidea, that corresponds to the former suborder Archeocaeniina) are represented by eight species in three genera, namely Actinastraeopsis (two species), Stelidioseris (five species) and Stephanastrea (one species). Actinastraeopsis and Stelidioseris species records are close to or match with their first occurrences or are new first records. The last record of the genus Stephanastrea is now extended up from the Tithonian to the upper Hauterivian. The studied corals are interpreted as colonies capable of thriving in mixed carbonate-siliciclastic environments and settling on soft substrates and able to resist moderate turbidity, sedimentation, and storm influence. Correlation with other actinastraeid Lower Cretaceous coral faunas shows affinities with those that are also record from mixed carbonate-siliciclastic environments such as the Paris Basin, East Iberia, Bisbee Basin and Texas Platform.

中文翻译：

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来自阿根廷中西部内乌肯盆地 Agrio 组的下白垩纪珊瑚：Actinastraeidae 科

摘要 本文介绍了对阿根廷中西部内乌肯盆地 Agrio 组（上瓦兰吉阶 - 上 Hauterivian）珊瑚动物群正在进行的系统修正的第一个结果。Actinastraeid 珊瑚（Actinastraeoidea 总科，对应于前亚目 Archeocaeniina）由 3 个属的 8 个物种代表，即 Actinastraeopsis（两种）、Stelidioseris（5 种）和 Stephanastrea（一种）。Actinastraeopsis 和 Stelidioseris 物种记录与它们的首次出现接近或匹配，或者是新的首次记录。Stephanastrea 属的最后记录现在从 Tithonian 延伸到上 Hauterivian。研究的珊瑚被解释为能够在混合碳酸盐-硅质碎屑环境中茁壮成长并定居在柔软的基质上并能够抵抗中等浊度、沉积和风暴影响的群体。与其他actinastraeid 下白垩纪珊瑚动物群的相关性显示出与那些也来自混合碳酸盐-硅质碎屑环境（例如巴黎盆地、东伊比利亚、比斯比盆地和德克萨斯地台）的记录的亲缘关系。