Condorodus n. gen., a new Ordovician conodont genus from Argentina: origin, evolution and dispersal through the western margin of Gondwana

IF 1.2 4区地球科学 Q3 PALEONTOLOGY

Comptes Rendus Palevol Pub Date : 2022-10-05 DOI:10.5852/cr-palevol2022v21a34

J. Carlorosi, Ana Mestre, S. Heredia

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引用次数: 2

Abstract

Ordovician conodont collections from several Argentinian basins including the Eastern Cordillera, Famatina and Precordillera allow recognition of a group of conodonts that comprise a new genus here named Condorodus n. gen. Species of this genus have an apparatus composed of six elements recovered so far: Pa, Pb, Sb1, Sb2, Sc and Sd. The differences mainly between the P elements support recognizing three species, from the older to younger: C. diablensis n. gen., n. sp., C. gracielae n. gen., n. sp. and C. chilcaensis n. gen., n. sp., that appeared in the upper Floian (Lower Ordovician) and vanished in middle Darriwilian time (Middle Ordovician). The Eastern Cordillera is here assumed as the place of origin of the Condorodus n. gen. lineage during the late Floian, and then this genus dispersed through the western margin of Gondwana, reaching the Precordillera in the early Darriwilian, from there it could have dispersed to different regions of Gondwana, Perigondwana and Laurentia during the late Darriwilian, and probably give rise to conodont apparatuses of similar morphology in the Late Ordovician.

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阿根廷奥陶系牙形石新属Condorodus n. gen.:冈瓦纳大陆西部边缘的起源、演化和分布

在包括东科迪勒拉、法马蒂纳和前科迪勒拉在内的几个阿根廷盆地收集到的奥陶系牙形刺标本中，有一组牙形刺组成了一个新属，在这里被命名为Condorodus n. gen.这个属的物种有一个由六种元素组成的仪器:Pa、Pb、Sb1、Sb2、Sc和Sd。P元素之间的差异主要支持从老到新三个物种的识别:C. diablensis n. gen.， n. sp.， C. gracielae n. gen.， n. sp.和C. chilcaensis n. gen.， n. sp.，它们出现于上弗洛世(下奥陶统)，消失于中达里威廉世(中奥陶统)。在弗洛世晚期，东科迪勒拉被认为是Condorodus n. geng谱系的起源地，然后这个属通过冈瓦纳的西部边缘分散开来，在Darriwilian早期到达Precordillera，在Darriwilian晚期，它可能从那里分散到冈瓦纳、Perigondwana和Laurentia的不同地区，并可能在晚奥陶纪产生类似形态的牙形刺装置。

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来源期刊

Comptes Rendus Palevol 地学-古生物学

CiteScore

2.10

自引率

0.00%

发文量

审稿时长

17.6 weeks

期刊介绍： Comptes Rendus Palevol is a fully electronic and peer-reviewed journal, with a continuous publication stream, devoted to palaeontology, prehistory and evolutionary sciences. It publishes original research results, in French or English, in the following domains: systematic and human palaeontology, prehistory, evolutionary biology and macroevolution, and history of sciences. Thematic issues may also be published under the responsibility of a guest editor. All articles published in Comptes Rendus Palevol are compliant with the different nomenclatural codes. A copyright assignment will be signed by the authors before publication.