PDF(Pubmed)
Abstract：
The Solnhofen Archipelago is well known for its fossil vertebrates of Late Jurassic age, among which figure numerous rhynchocephalian specimens, representing at least six and up to nine genera. A new taxon, named Sphenofontis velserae gen. et sp. nov., increases rhynchocephalian diversity in the Solnhofen Archipelago and is herein described based on a single, well-preserved specimen originating from the Late Kimmeridgian of the Brunn quarry, near Regensburg. The exquisite preservation of the holotype allowed a detailed description of the animal, revealing a skeletal morphology that includes both plesiomorphic and derived features within rhynchocephalians. Sphenofontis is herein referred to Neosphenodontia and tentatively to sphenodontine sphenodontids. It notably differs from all other rhynchocephalians known from the Jurassic of Europe, showing instead closer resemblance with the Middle Jurassic Cynosphenodon from Mexico and especially the extant Sphenodon. This is evidence for a wide distribution of taxa related to the extant tuatara early in the Mesozoic, and also for the presence of less-specialized rhynchocephalians coexisting with more derived forms during the earliest time in the history of the Solnhofen Archipelago.
摘要：
索尔恩霍芬群岛以其侏罗纪晚期的脊椎动物化石而闻名，其中有许多龙舌兰标本，代表至少六个属，最多九个属。一个新的分类单元，名为Sphenofontisvelserae。等sp.11月。,增加了Solnhofen群岛的rhynchocephalian多样性，在此基于单一的描述，保存完好的标本来自布鲁恩采石场的Kimmeridgian晚期，在雷根斯堡附近.完整类型的精美保存使动物得以详细描述，揭示了一种骨骼形态，该形态包括钩虫中的多形性和衍生特征。Sphenofontis在本文中被称为新蝶齿，暂时被称为蝶齿。它与欧洲侏罗纪已知的所有其他rhynchocephalians明显不同，相反，与墨西哥的中侏罗世Cynosphenodon，尤其是现存的Sphenodon更加相似。这是中生代早期与现存的tuatara相关的分类单元广泛分布的证据，以及在Solnhofen群岛历史上最早的时间内，存在较少专业化的rhynchocephalians与更多派生形式共存。
