Abstract Six well-preserved partial specimens of the varunid crab Neohelice granulata Dana1851, from the mid-Holocene, Villa Soriano Formation, Playa Pascual site (Uruguay) are described, constituting the northernmost fossil record so far. These specimens allow a review of the depositional environment and evolution of fossil assemblages and modern populations of N. granulata. The relatively good state of preservation of the material suggests death within their burrows or closely associated with them, and most of the preserved exoskeletal elements possess sufficient anatomical information to diagnose N. granulata as the producer of the assemblage. Complete material from the mid-Holocene of Pereyra Iraola Park, northeastern Buenos Aires, Argentina (located in the opposite side of the La Plata estuary) suggests that fossil assemblages of this crab represent a concentration of the record. This study also suggests that the fossil assemblages described so far were deposited in a low sedimentary rate depositional environment during the last marine highstand and that fluvial channel constituted temporary water bodies.

中文翻译：

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使用 Neohelice granulata (Decapoda: Brachyura: Varunidae) 作为工具沿拉普拉塔河口的最后一个海洋高位的沉积环境及其演化

摘要 描述了 6 个保存完好的新世中期、普拉亚帕斯夸尔遗址（乌拉圭）Villa Soriano 组的巨蟹蟹 Neohelice granulata Dana1851 部分标本，是迄今为止最北端的化石记录。这些标本允许回顾沉积环境和化石组合的演化以及 N. granulata 的现代种群。材料相对良好的保存状态表明它们的洞穴内或与它们密切相关，并且大多数保存的外骨骼元件具有足够的解剖学信息，可以将 N. granulata 诊断为组合的生产者。来自布宜诺斯艾利斯东北部 Pereyra Iraola 公园全新世中期的完整材料，阿根廷（位于拉普拉塔河口的对面）表明这种螃蟹的化石组合代表了记录的集中。这项研究还表明，迄今为止所描述的化石组合是在最后一个海洋高位期间沉积在低沉积速率沉积环境中的，河流通道构成了临时水体。