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A new non-marine osteichthyan fauna from the Upper Cretaceous (Campanian) of West Texas: Additional evidence for latitudinal segregation among bony fish in the Western Interior
Cretaceous Research ( IF 2.1 ) Pub Date : 2022-07-14 , DOI: 10.1016/j.cretres.2022.105299
Steven L. Wick , Alyson A. Brink

A new osteichthyan fauna from the lower Campanian Aguja Formation of West Texas represents a critical southern datum regarding the interpretation of faunal differences observed among Upper Cretaceous, non-marine fish assemblages of the Western Interior. Bony fish are represented within the “Lowerverse” local fauna by as many as 21 primitive and advanced species. The Lowerverse locality is situated at the southern end of a geographic range of paracontemporaneous localities in Laramidia that have produced a number of similarly well-sampled osteichthyan assemblages. A comparison of the Lowerverse bony fish fauna with those of southern Utah and southern Alberta supports previous hypotheses regarding the latitudinal segregation of some species in the Western Interior. Given their ubiquity throughout Late Cretaceous North America in both time and space, the north-south geographical segregation of garfishes in the Western Interior is especially revealing in this regard and reveals that some species were markedly provincial during the Campanian. Taxonomic inconsistencies among these regional faunas are observed even at higher taxonomic ranks and infer that such differences are sending meaningful ecological signals.



中文翻译:

来自西德克萨斯上白垩统(坎帕尼亚)的一种新的非海洋骨鱼动物群:西部内陆硬骨鱼纬度分离的额外证据

来自西得克萨斯州下坎帕尼亚 Aguja 组的一个新的 osteichthyan 动物群代表了一个关键的南部基准,用于解释在西部内陆的上白垩纪非海洋鱼类组合中观察到的动物群差异。在“Lowerverse”当地动物群中,有多达 21 种原始和高级物种代表硬骨鱼。Lowerverse 地区位于拉拉米迪亚地区地理范围的南端,这些地区产生了许多类似的采样良好的骨鱼组合。下界硬骨鱼类动物群与犹他州南部和阿尔伯塔省南部的比较支持先前关于西部内陆某些物种在纬度上分离的假设。鉴于它们在时间和空间上在整个晚白垩世北美洲无处不在,在这方面,西部内陆的garfishes的南北地理隔离尤其具有启发性,并表明某些物种在坎帕尼亚时期是明显的地方性物种。即使在更高的分类等级上也观察到这些区域动物群之间的分类不一致,并推断这种差异正在发出有意义的生态信号。

更新日期:2022-07-14
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