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首页> 外文期刊>Journal of Systematic Palaeontology >New hybodontiform and neoselachian sharks from the Lower Triassic of Oman
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New hybodontiform and neoselachian sharks from the Lower Triassic of Oman

机译：来自阿曼下三叠纪的新的齿形和新鲨鱼鲨

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摘要

Elasmobranchs are reported for the first time from Lower Triassic deposits in Oman, The well-preserved remains consist of isolated teeth, dermal denticles and fin spines, recovered from conodont residues. The low-palaeolatitude sections consist of Lopingian-Olenekian shallow and pelagic carbonates in exotics, olistoliths and breccia blocks that have been redeposited in younger allochthonous strata of the Hawasina Basin throughout the Oman Mountains at Jabal Safra (olistoliths within the Jurassic Guwayza Formation, Olenekian), as well as at Wadi Aiwa (exotic Aiwa Formation, Lopingian-Olenekian) and Wadi Wasit Block (slope breccia in the Al Jil Formation, Induan), both of which occur in the Ba'id region. The recovered fauna contains a small number of pre-existing genera, but is mainly composed of new hybodont and neoselachian taxa. They are identified as: Omanoselache halli Koot & Cuny sp. nov., cf. Omanoselache sp., Safrodus tozeri Koot & Cuny gen. et sp. nov. and Polyfaciodus pandus Koot & Cuny gen. et sp. nov., based on the majority of the recovered dental remains. Spine fragments are identified as cf. Amelacanthus sp. This fauna represents the second published record of neoselachian teeth from the Induan and the most extensive record from the Lower Triassic in terms of abundance and diversity. The fauna is dominated by Neoselachii, whereas other Early Triassic faunas are hybodont-dominated, and histological study of the neoselachian enameloid significantly adds to our knowledge of the early stages of their evolution. All described taxa are new to the Oman fossil record and that of western Neotethys, apart from Omanoselache and Amelacanthus, which have been recognized from Wordian deposits, and Omanoselache is the second genus from Oman known to have survived the late Permian mass extinction. The level of faunal diversity recognized here is comparable to other Early Triassic faunas but is much reduced compared to the Wordian pre-extinctions fauna.
机译：首次报道了来自阿曼下三叠纪沉积物中的弹性分支。保存完好的遗骸由孤立的牙齿，真皮细齿和鳍刺组成，这些牙齿是从牙形石残留物中回收的。低古隆起部分包括外来物，低碳岩和角砾岩块中的洛平岩-奥列涅克浅层和上层碳酸盐岩，这些碳酸盐岩已重新沉积在哈曼纳盆地的年轻异源地层中，分布在贾巴尔·萨夫拉地区的阿曼山脉（奥莱涅肯侏罗纪古韦萨组内的橄榄岩）以及瓦迪·爱瓦（异国情调的爱瓦组，洛平安-奥列尼克）和瓦迪·瓦西特区块（印地Al Jil组的坡角砾岩）都发生在拜伊德地区。恢复的动物区系包含少量先前存在的属，但主要由新的猪齿科和新水栖类群组成。它们被标识为：Omanoselache halli Koot＆Cuny sp.。十一月。 Omanoselache sp。，Safrodus tozeri Koot＆Cuny gen。等。十一月和Polyfaciodus pandus Koot＆Cuny gen。等。十一月，基于回收的大部分牙齿残骸。脊柱碎片标识为cf。 Amelacanthus sp。该动物群是印支地区新狼蛛牙齿的第二次公开记录，也是下三叠纪最丰富的记录（就数量和多样性而言）。该动物群以新龟纲为主导，而其他早期三叠纪动物群则以hybodont为主，对新鞘翅目同名生物的组织学研究极大地增加了我们对它们进化的早期阶段的了解。所有描述的分类单元都是阿曼化石记录和西方新特提斯人记录的新分类单元，除了已从Wordian矿床中识别出来的Omanoselache和Amelacanthus外，Omanoselache是​​来自阿曼的第二属，已知在二叠纪大灭绝后幸存下来。此处认识到的动物多样性水平可与其他早期三叠纪动物区系相媲美，但与Wordian灭绝前的动物区系相比却大大降低了。

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