Over the last few years, the morphology, taxonomy and systematics of the cartilaginous fish taxa of the two main sites of the Bolca Lagerstätte, Italy, (Pesciara and Monte Postale sites) have been extensively discussed in a series of papers, resulting in a complete revision of this neglected component of the Eocene Tethyan ichthyofauna. Here, we provide a comprehensive overview of the diversity, palaeoecology and palaeoenvironmental significance of the two chondrichthyan assemblages of the Pesciara and Monte Postale sites. The assemblages include 14 shark species (Lamniformes and Carcharhiniformes) and batoids (Torpediniformes, Rhinopristiformes, Myliobatiformes, Platyrhinidae and Zanobatidae), as well as a single putative chimaeriform. The Pesciara and Monte Postale sites are characterized by eight chondrichthyan taxa each, but the taxonomic compositions are distinctly different reflecting the dissimilarities in the overall composition of both fish assemblages. Palaeoecological interpretations and habitat preferences of the two chondrichthyan assemblages are consistent with previously hypothesized palaeoenvironmental settings based on sedimentological, palaeontological and geochemical evidence. The chondrichthyan assemblages of the two sites appear to be constituted by ecologically vicariant taxa, with both characterized by a predominance of benthic species with durophagous/cancritrophic feeding modes. Taxonomic composition, habitat preferences and palaeobathymetric analyses support the hypothesis that both assemblages occupied tropical marine shallow waters (likely up to 50 m deep) of the inner portion of the Lessini Shelf. The taxonomic composition of both sites is considerably different from that of any other contemporaneous Tethyan and Boreal chondrichthyan assemblages.

中文翻译：

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意大利 Bolca Lagerstätte 始新世软骨鱼类组合的多样性、古生态学和古环境意义

在过去的几年里，意大利博尔卡拉格施泰特的两个主要遗址（佩夏拉和蒙特邮政遗址）的软骨鱼类群的形态学、分类学和系统学已在一系列论文中进行了广泛的讨论，从而形成了完整的对始新世特提斯鱼群这一被忽视的组成部分进行了修订。在这里，我们全面概述了 Pesciara 和 Monte Postale 遗址的两个软骨鱼类组合的多样性、古生态学和古环境意义。这些组合包括 14 种鲨鱼物种（Lamniformes 和 Carcharhiniformes）和蝙蝠类（Torpediniformes、Rhinopristiformes、Myliobatiformes、Platyrhinidae 和 Zanobatidae），以及一个推定的嵌合体。Pesciara 和 Monte Postale 遗址各有 8 个软骨鱼类分类群，但分类组成明显不同，反映了两种鱼类组合整体组成的不同。两个软骨鱼类组合的古生态解释和栖息地偏好与先前基于沉积学、古生物学和地球化学证据假设的古环境设置一致。这两个地点的软骨鱼组合似乎由生态变异类群构成，两者都以具有硬食性/食蟹性摄食模式的底栖物种为主。分类组成、栖息地偏好和古水深分析支持这样的假设，即这两个组合占据了莱西尼大陆架内部的热带海洋浅水区（可能深达 50 m）。