Seymour Island, Antarctic Peninsula, was once called the ‘Rosetta Stone’ of Southern Hemisphere palaeobiology, because this small island provides the most complete and richly fossiliferous Palaeogene sequence in Antarctica. Among fossil marine vertebrate remains, chondrichthyans seemingly were dominant elements in the Eocene Antarctic fish fauna. The fossiliferous sediments on Seymour Island are from the La Meseta Formation, which was originally divided into seven stratigraphical levels, TELMs 1–7 (acronym for Tertiary Eocene La Meseta) ranging from the upper Ypresian (early Eocene) to the late Priabonian (late Eocene). Bulk sampling of unconsolidated sediments from TELMs 5 and 6, which are Ypresian (early Eocene) and Lutetian (middle Eocene) in age, respectively, yielded very rich and diverse chondrichthyan assemblages including over 40 teeth of carpet sharks representing two new taxa, Notoramphoscyllium woodwardi gen. et sp. nov. and Ceolometlaouia pannucae gen. et sp. nov. Two additional teeth from TELM 5 represent two different taxa that cannot be assigned to any specific taxon and thus are left in open nomenclature. The new material not only increases the diversity of Eocene Antarctic selachian faunas but also allows two previous orectolobiform records to be re-evaluated. Accordingly, Stegostoma cf. faciatum is synonymized with Notoramphoscyllium woodwardi gen. et sp. nov., whereas Pseudoginglymostoma cf. brevicaudatum represents a nomen dubium. The two new taxa, and probably the additional two unidentified taxa, are interpreted as permanent residents, which most likely were endemic to Antarctic waters during the Eocene and adapted to shallow and estuarine environments.

http://zoobank.org/urn:lsid:zoobank.org:pub:DD064382-3802-41A9-9B89-3095A6533B8A

南极半岛的西摩岛曾被称为南半球古生物学的“罗塞塔石碑”，因为这个小岛提供了南极洲最完整、化石最丰富的古近纪序列。在海洋脊椎动物化石残骸中，软骨鱼类似乎是始新世南极鱼类动物群的主要元素。Seymour 岛上的化石沉积物来自 La Meseta 组，最初分为 7 个地层级别，TELMs 1-7（Tertiary Eocene La Meseta 的首字母缩写），范围从上伊普勒阶（始新世早期）到普里雅博世晚期（始新世晚期） ）。来自 TELM 5 和 6 的松散沉积物的批量取样，它们的年龄分别为伊普雷西亚（始新世早期）和鲁特西亚（始新世中期），Notoramphoscyllium woodwardi根。等人。十一月 和Ceolometlaouia pannucae gen。等人。十一月 来自 TELM 5 的另外两个牙齿代表两个不同的分类单元，它们不能分配给任何特定的分类单元，因此保留在开放命名法中。新材料不仅增加了始新世南极鲨类动物群的多样性，而且还允许重新评估之前的两个直齿双形记录。因此，Stegostoma cf。faciatum与Notoramphoscyllium woodwardi gen 同义。等人。十一月，而Pseudoginglymostoma cf。brevicaudatum代表一个nomen dubium. 这两个新的分类群，可能还有另外两个身份不明的分类群，被解释为永久居民，它们很可能是始新世时期南极水域的特有物种，并适应了浅水和河口环境。

http://zoobank.org/urn:lsid:zoobank.org:pub:DD064382-3802-41A9-9B89-3095A6533B8A