西伯利亚北部上白垩世(下阿加帕河段)的氨类和鞘类颚骨

IF 1.9 3区 地球科学 Q1 GEOLOGY
Aleksandr Mironenko , Mikhail Rogov , Alexey Ippolitov , Irina Smurova , Victor Zakharov
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引用次数: 0

摘要

头足类、氨龙类,尤其是鞘翅目动物的颚化石很少见。在化石中发现属于不同头足类的多样化颚部的地方更是少见。我们描述了来自北西伯利亚上震旦纪-中都龙纪的一个多样化头足类颌骨复合体,其中包括胎盘虫(Placenticeras)氨虫的上颚和下颚(迄今所知最古老的胎盘虫颚部)以及八腕类鞘翅目的大型颚部。虽然Placenticeras的下颚属于无栉类型的类颚装置,但它们的特点是其前部的内部有机层增厚,形状类似于中生代鹦鹉螺类、睑蝠类和蝶蝠类类颚装置前部的钙化海螺。海螺状结构的存在支持了这样的假设,即胎生动物下颌的觅食功能很可能比保护功能更重要。Placenticeras的上颚显示出无棘皮动物颚部的典型结构:内层分为两翼,外层尖锐。八腕类共生动物的大型上颚显示出与八爪类动物颚部的密切亲缘关系,这表明它们可能属于八爪类动物的代表,很可能是体型巨大的角剑类。从下颚的大小来看,栖息在北西伯利亚海盆中的氨形类和八爪类都具有体型庞大的特点。头足类的组合在整个仙人掌纪末期和都龙纪上半期保持不变。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Ammonoid and coleoid jaws from the Upper Cretaceous of northern Siberia (Nizhnyaya Agapa River sections)

The jaws of cephalopods, ammonites and especially coleoids, are rarely met in fossil state. The localities with diversified jaws, belonging to various groups of fossil cephalopods are even less common. We describe a diversified complex of cephalopod jaws from the upper Cenomanian–middle Turonian of Northern Siberia, which include the upper and lower jaws of Placenticeras ammonites (the oldest placenticeratid jaws known to date) and large-sized jaws of octobrachian coleoids. Although the lower jaws of Placenticeras belong to the aptychus type of ammonoid jaw apparatuses, they are characterized by the thickening of an inner organic layer in their anterior part, with a shape resembling a calcified conchorhynch known in the anterior portion of the lower jaws of Mesozoic nautilids and lytoceratid and phylloceratid ammonoids. The presence a conchorhynch-like structure supports the assumption that the feeding function in placenticeratid lower jaws most likely prevailed over the protective one. The upper jaws of Placenticeras show structure, typical for the jaws of aptychophoran ammonites: an inner lamella, divided into two wings, and a pointed outer lamella. Large-sized upper jaws of octobrachian coleoids demonstrate close affinities with the jaws of Octopoda suggesting that they could have belonged to representatives of this order, probably to large-sized gladius-bearing teudopseins. Judging by the jaws' size, both ammonites and octobrachians, which inhabited the marine basin in the Northern Siberia, were characterized by large body size. The cephalopod assemblage remained unchanged throughout the end of the Cenomanian and the first half of the Turonian.

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来源期刊
Cretaceous Research
Cretaceous Research 地学-地质学
CiteScore
4.10
自引率
19.00%
发文量
235
审稿时长
12 weeks
期刊介绍: Cretaceous Research provides a forum for the rapid publication of research on all aspects of the Cretaceous Period, including its boundaries with the Jurassic and Palaeogene. Authoritative papers reporting detailed investigations of Cretaceous stratigraphy and palaeontology, studies of regional geology, and reviews of recently published books are complemented by short communications of significant new findings. Papers submitted to Cretaceous Research should place the research in a broad context, with emphasis placed towards our better understanding of the Cretaceous, that are therefore of interest to the diverse, international readership of the journal. Full length papers that focus solely on a local theme or area will not be accepted for publication; authors of short communications are encouraged to discuss how their findings are of relevance to the Cretaceous on a broad scale. Research Areas include: • Regional geology • Stratigraphy and palaeontology • Palaeobiology • Palaeobiogeography • Palaeoceanography • Palaeoclimatology • Evolutionary Palaeoecology • Geochronology • Global events.
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