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A large marine gar fish (Ginglymodi, Lepisosteiformes) from the Turonian Akrabou Formation of Asfla, Morocco
Cretaceous Research ( IF 2.1 ) Pub Date : 2021-04-15 , DOI: 10.1016/j.cretres.2021.104839
Samuel L.A. Cooper , David M. Martill , Thomas Beevor , James Gunn

The Upper Cretaceous (Turonian) Akrabou Formation at Asfla in south east Morocco is a marine carbonate succession well-known for its exceptionally preserved, often three-dimensional marine vertebrate fossils. It is perhaps best known for its diverse ichthyological assemblage comprising both cartilaginous and bony fishes, notably teleosts and pycnodonts. However, holostean fishes (Holostei), particularly gars (Ginglymodi, Lepisosteiformes) are previously unreported from the formation. Described here is a partial specimen consisting the articulated squamation of a notably large marine lepisosteiform (Gar). Fossil and extant gars are predominantly recorded in freshwater environments and therefore the occurrence of the new specimens in an outer shelf marine deposit is unusual. The Asfla specimen is confidently assigned to Lepisosteidae based on its characteristic squamation which differentiates it from all other gar families. Specimen biostratinomy and taphonomy is discussed with revision of the lepisosteiform fossil record of Morocco.



中文翻译:

来自摩洛哥阿斯弗尔的突尼斯阿克拉布组的大型海水鱼(Ginglymodi,Lepisosteiformes)

摩洛哥东南部阿斯弗尔的上白垩统(突厥人)阿克拉布组是海相碳酸盐岩演替,以其保存完好的,通常是三维海洋脊椎动物化石而闻名。它可能以其多样化的鱼类学组合而闻名,其中包括软骨鱼类和骨鱼类,尤其是硬骨鱼和比目鱼。但是,以前没有从该地层报告过全捕捞鱼类(Holostei),尤其是鱼(Ginglymodi,Lepisosteiformes)。这里描述的是一个局部标本,包括明显大型的海洋鳞茎骨(Gar)的关节鳞状。化石和现存的gars主要记录在淡水环境中,因此在外部架子海洋沉积物中出现新标本的情况很罕见。根据其特征性鳞屑,将Asfla标本自信地分配给了Lepisosteidaidae,使其与其他所有gar族不同。通过修改摩洛哥的蛇形骨化石记录,讨论了标本的生物地层学和分类学。

更新日期:2021-05-07
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