This contribution presents the second part of the results of an ongoing systematic revision of the coral fauna from mixed carbonate-siliciclastic sedimentary facies of the Agrio Formation (upper Valanginian–upper Hauterivian) of the Neuquén Basin, west-central Argentina. Columastraeid corals (superfamily Cladocoroidea, that corresponds partly to the suborder Faviina) are represented by six species of the genus Eocolumastrea Löser and Zell, 2015, namely E. gortanii, E. magna, E. neuquensis, E. octaviae, E. cf. octaviae and E. sp. 2. Records of the species are close or match with their first appearances worldwide. The studied corals correspond to mostly ramose and secondarily massive colonies, that are here interpreted as 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 columastraeid Lower Cretaceous coral faunas shows affinity with those also recorded in mixed carbonate-siliciclastic sedimentary facies, such as the Bisbee Basin.

这项贡献是对阿根廷中西部内乌肯盆地Agrio组（瓦朗吉尼阶上至Hauterivian上）的Agrio组碳酸盐-硅质碎屑混合沉积相进行的珊瑚群落不断系统修订的结果的第二部分。Columastraeid珊瑚（超家族Cladocoroidea，其部分原因是亚目Faviina对应于）由六个属种的表示Eocolumastrea失败者和泽尔，2015，即E. gortanii，E.蚤，E. neuquensis，E. octaviae，E.比照 屋大维和E.sp。2.该物种的记录接近或与其全球首次出现相匹配。研究的珊瑚主要对应于散乱的和第二大的殖民地，在这里被解释为能够在碳酸盐-硅质碎屑混合环境中繁衍并在软质基质上沉降，并能够抵抗中等的浊度，沉积和风暴影响。与其他columastraeid下白垩纪珊瑚动物群的相关性显示出与在Bisbee盆地等碳酸盐-硅质碎屑混合沉积相中也记录到的那些具有相似性。