Discovery of †Obaichthyidae gars (Holostei, Ginglymodi, Lepisosteiformes) in the Aptian Codo Formation of the Parnaiba Basin: Remarks on paleobiogeographical and temporal range
Discovery of †Obaichthyidae gars (Holostei, Ginglymodi, Lepisosteiformes) in the Aptian Codo Formation of the Parnaiba Basin: Remarks on paleobiogeographical and temporal range
复制标题
DOI：
10.1016/j.cretres.2015.10.017
复制
发表时间：
2016-04-01
影响因子：
2.1
通讯作者：
Machado, Giselle de Paula
中科院分区：
文献类型：
--
作者：
Brito, Paulo M.;Lindoso, Rafael M.;Machado, Giselle de Paula
在这里，我们报告的第一匕首obaichthyid加尔从早白垩世（Aptian）代码，形成的帕尔奈巴盆地，巴西东北部。它显示了以下obaichthyid特征：大量的齿骨牢固地附着在真皮骨的外表面，上颌骨自由和移动的，存在间骨，后翼骨和外翼骨之间缺乏接触，没有泪上颌骨，以及在鳞片后缘有突出的棘。由于鳞片上有一个突出的腹后刺和一些额外的后缘刺，科多组的鱼显然是在阿拉比盆地的阿尔比恩桑塔纳组发现的同一物种，Dentilepisosteus laevis。虽然可能仅限于淡水或微咸水，但这一新发现为帕尔奈巴和阿拉里普盆地的组合又增加了一个分类群。新的记录将这个物种的时间范围延伸到Aptian（大约比以前的出现早1000万年）。(C)2015爱思唯尔有限公司版权所有。
Here we report the first dagger obaichthyid gar from the Lower Cretaceous (Aptian) Code, Formation of the Parnaiba Basin, Northeastern Brazil. It shows the following obaichthyid characters: numerous odontods firmly attached to the outer surface of the dermal bones, free and mobile maxilla, presence of interopercle, lack of contact between the metapterygoid and ectopterygoid, absence of lacrimomaxillary bones, and a prominent spine at the posterior margin of the scales. Due to the presence of scales bearing a prominent ventral posterior spine and a number of additional posterior marginal spines, the fish from the Codo Formation is noticeably the same species found in the Albian Santana Formation of the Araripe Basin, Dentilepisosteus laevis. Although probably restricted to fresh or brackish water, the new discovery adds one more taxon to the assemblages found in the Parnaiba and the Araripe basins. The new record extends the temporal range of this species down into the Aptian (about similar to 10 myr older than the previous occurrence). (C) 2015 Elsevier Ltd. All rights reserved.