Abstract Two incomplete mandibles are assigned to Pelagornithidae given the presence of a well marked neurovascular furrow and the unique bony projections, or “pseudo-teeth”, along the crista tomialis. Specimens IAA-Pv 175 from Ypresian levels of La Meseta Alloformation (Cucullaea I Allomember), and IAA-Pv 823 from Bartonian beds of the Submeseta Alloformation, in Seymour Island (Antarctic Peninsula, West Antarctica) corresponds to the morpho-type 1, previously proposed for Antarctic pseudo-tooth birds. The intermediate condition of the pseudo-teeth of these specimens reinforces the idea that diet changed from piscivory to molluscivory along the evolutive history of the group.

中文翻译：

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来自南极洲西摩岛的其他 Pelagornithidae 遗骸

摘要 两个不完整的下颌骨被归为 Pelagornithidae，因为存在明显的神经血管沟和独特的骨突起，或“假牙”，沿嵴。来自 La Meseta Alloformation（Cucullaea I Allomember）的 Ypresian 水平的标本 IAA-Pv 175 和来自西摩岛（南极半岛西部南极洲）的 Submeseta Alloformation 的 Bartonian 床的 IAA-Pv 823 对应于先前的形态类型 1建议用于南极假牙鸟。这些标本假牙的中间状态强化了这样一种观点，即饮食在该群体的进化历史中从食鱼变成了软体动物。