Earliest known lepisosteoid extends the range of anatomically modern gars to the Late Jurassic.
Earliest known lepisosteoid extends the range of anatomically modern gars to the Late Jurassic.
复制标题
DOI：
10.1038/s41598-017-17984-w
复制
发表时间：
2017-12-19
影响因子：
4.6
通讯作者：
Meunier FJ
中科院分区：
文献类型：
--
作者：
Brito PM;Alvarado-Ortega J;Meunier FJ
Lepisosteoids以其进化上的保守性而闻名，它们的身体结构至少可以追溯到白垩纪早期，此时两个科已经分化：Lepisosteidae，自白垩纪晚期以来就为人所知，包括来自除南极洲和澳大利亚以外的所有大陆的所有现存物种和各种化石，以及Obaichthyidae，仅限于巴西东北部和摩洛哥的白垩纪。迄今为止，已知最古老的鳞类鱼是鱼类，它们表现出在鳞类类中丢失或转变的一般新翅目特征。在这里，我们描述了来自墨西哥特拉克西亚科盆地上侏罗统（启默里阶 - 约 157 Myr）的已知最早的类石类（Nhanulepisosteus mexicanus gen. and sp. nov.）。新的分类单元基于分离的颅骨碎片，以三维和鳞片形式保存。 Nhanulepisosteus 被发现是作为其他 Lepisosteidae 的姐妹分类单元。这将lepisosteoids的时间范围扩大了约46 Myr，将lepisosteids的时间范围扩大了约57 Myr，并填补了目前对该类群早期多样化理解的一个主要形态学空白。
Lepisosteoids are known for their evolutionary conservatism, and their body plan can be traced at least as far back as the Early Cretaceous, by which point two families had diverged: Lepisosteidae, known since the Late Cretaceous and including all living species and various fossils from all continents, except Antarctica and Australia, and Obaichthyidae, restricted to the Cretaceous of northeastern Brazil and Morocco. Until now, the oldest known lepisosteoids were the obaichthyids, which show general neopterygian features lost or transformed in lepisosteids. Here we describe the earliest known lepisosteoid (Nhanulepisosteus mexicanus gen. and sp. nov.) from the Upper Jurassic (Kimmeridgian – about 157 Myr), of the Tlaxiaco Basin, Mexico. The new taxon is based on disarticulated cranial pieces, preserved three-dimensionally, as well as on scales. Nhanulepisosteus is recovered as the sister taxon of the rest of the Lepisosteidae. This extends the chronological range of lepisosteoids by about 46 Myr and of the lepisosteids by about 57 Myr, and fills a major morphological gap in current understanding the early diversification of this group.
登录
查看更多内容
影响因子：
2.1
作者：
Brito, Paulo M.;Lindoso, Rafael M.;Machado, Giselle de Paula
通讯作者：
Machado, Giselle de Paula
影响因子：
--
作者：
Cavin, Lionel
通讯作者：
Cavin, Lionel
影响因子：
1.4
作者：
Alvarado-Ortega, Jesus;Brito, Paulo M.
通讯作者：
Brito, Paulo M.
影响因子：
1.5
作者：
Kammerer, Christian F.;Grande, Lance;Westneat, Mark W.
通讯作者：
Westneat, Mark W.
DOI：
10.1098/rspb.2006.3749
发表时间：
2007-02-22
影响因子：
4.7
作者：
Hurley, Imogen A.;Mueller, Rachel Lockridge;Coates, Michael I.
通讯作者：
Coates, Michael I.