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Upper Triassic semionotids from western Gondwana

冈瓦纳西部的上三叠世半兽类

基本信息

批准号：
42000879
负责人：
Dr. Adriana López-Arbarello
金额：
--
依托单位：
Sektion Paläontologie und Geobiologie
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2007
资助国家：
德国
起止时间：
2006-12-31 至 2007-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/42000879?language=en
关键词：
Upper Triassic semionotids western Gondwana

项目摘要

Semionotids are among the most important, though less understood basal neopterygian fishes. They represent one of the first and most important radiations of this group, which also includes the teleosts and thus most of the Recent bony fishes. Therefore, knowledge of basal neopterygian phylogenetic relationships and evolution is essential to understand teleost evolution and biodiversity. Since teleosts originated in the late Triassic, the early history of basal neopterygians like the semionotiformes is of special interest. The early fossil record of the semionotiforms is largely biased to the Northern Hemisphere and very little is known about the origin and first radiation of this group in Gondwana. The continental Upper Triassic Cacheuta Formation (Norian) in Argentina has yielded one of the very few records of the group in the Triassic of Gondwana and the only Triassic articulated semionotid remains in South America. This fish, Semionotus vallejensis, thus represents a unique opportunity to have an insight into the early history of semionotiforms in Western Gondwana. The aim of this project is to carry out a fieldwork campaign to collect more material of Semionotus vallejensis, so far represented by a single incompletely preserved specimen. With the new material, the taxon will be studied in detailed, including a taxonomic revision and analysis of its phylogenetic relationships.

半齿鱼是最重要但了解较少的基础新翅目鱼类之一。它们代表了该类群中最早也是最重要的辐射之一，该类群还包括硬骨鱼以及大多数近代硬骨鱼。因此，了解新翅目基础系统发育关系和进化对于了解硬骨鱼进化和生物多样性至关重要。由于硬骨鱼起源于三叠纪晚期，像半潜鱼目这样的基部新翅目动物的早期历史特别令人感兴趣。半翁类的早期化石记录很大程度上偏向于北半球，人们对冈瓦纳古陆这一类群的起源和首次辐射知之甚少。阿根廷大陆上三叠纪卡舒塔组（诺里安）是冈瓦纳三叠纪极少数记录之一，也是南美洲唯一的三叠纪铰接半节虫遗迹。因此，这种名为 Semionotus vallejensis 的鱼代表了了解冈瓦纳西部半带鱼早期历史的独特机会。该项目的目的是开展实地调查活动，收集更多的 Semionotus vallejensis 材料，迄今为止，该材料仅以一个未完全保存的标本为代表。利用新材料，将对该分类单元进行详细研究，包括分类学修订和系统发育关系分析。