Yunnan is the oldest reference books of new finfish fossil 244 million years Yunnan luoping | | fish fossils _ news
Luster ribbed scale fish male specimen
Female specimens and female specimens restoration plan

Scientists in luoping County, Yunnan province, China found fish fossils of 244 million years ago, named shine rib, fish scales, this is found in the oldest, most primitive reference books new finfish species. The study, published in the current issue of the scientific bulletin.

According to reports, the new fin-fish is the largest evolutionary lineage of finned fish subclass, distributed in various water environments on Earth. Apart from fishes and sturgeon, all other living finned fish belonging to the new fin-fish species. New fin-fish is the ancient origins and early radiation of fishes and an important subject in the study of evolutionary biology.

On this subject, in recent years the Institute of ancient vertebrate and ancient human Research Institute research team Xu Guanghui field work carried out in Yunnan, access to a large number of beautifully preserved fossil specimens of new finfish. At luoping County Qujing city, according to the middle Triassic marine strata of the shianni period of 11 save delicate fish fossils, postgraduate Ma Xinying Xu Guanghui and naming a new backbone for new finfish species: gloss fin fish scales.

Gloss fin fish scales is the ribs, fish scales the most ancient, the most representative of the original, ribbed scales of fish than previously found in Europe as early as 2 million years earlier than discovered in Guizhou, China Oriental rib, fish scales for 4 million years. And other ribs similar to the scales of fish, with gloss fin fish scales of the male mate (gonopodium), for internal fertilization. Internal fertilization is a necessary precondition for reference books, the male genitalla was ovoviviparous Teleost, the key identification characteristics of new finfish.

Xu Guanghui said of ovoviviparous Teleost fish to adapt to particular environments have evolved a reproductive strategy. Triassic appearance of ovoviviparous Teleost fish may be there is some kind of link with the marine environment. But fish reference books of unclear origins and environment, further research is needed. (Reporter Yang Zhigao)

Responsible editor: Wu Yan

Article keywords:
Luoping County, Yunnan province fish fossil

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云南现最古老卵胎生新鳍鱼类化石 距今2.44亿年|云南罗平|鱼类化石_新闻资讯
光泽肋鳞鱼雄性标本
雌性标本和雌性标本复原图

　　中国科学家在云南罗平发现了2.44亿年前的鱼类化石，命名为光泽肋鳞鱼，这是目前发现的最古老、最原始的卵胎生新鳍鱼物种。该研究成果发表在最新一期的《科学通报》上。

　　据介绍，新鳍鱼类是辐鳍鱼亚纲最大的演化支系，几乎分布于地球上各种水环境。除了多鳍鱼和鲟鱼，其他所有的现生辐鳍鱼类都属于新鳍鱼类。新鳍鱼类的起源和早期辐射是目前古鱼类学和进化生物学研究中的重要课题。

　　围绕这一课题，近年来中科院古脊椎动物与古人类研究所徐光辉研究团队在云南开展野外工作，获得了大量保存完好的新鳍鱼类化石标本。根据采集于曲靖市罗平县中三叠世安尼期海相地层的11块保存精美的鱼化石，徐光辉及其研究生马昕莹命名了一种新的基干新鳍鱼物种： 光泽肋鳞鱼。

　　光泽肋鳞鱼是目前肋鳞鱼目最古老、最原始的代表，它比此前在欧洲发现的肋鳞鱼类要早两百万年，比中国贵州发现的东方肋鳞鱼要早四百万年。和其他肋鳞鱼类相似，光泽肋鳞鱼的雄鱼具有交配器（特化的臀鳍），用于体内受精。体内受精是卵胎生的必要前提条件，雄鱼交配器则是卵胎生新鳍鱼类的关键鉴定特征。

　　徐光辉说，卵胎生是鱼类为适应特定环境进化出的一种生殖策略。三叠纪卵胎生鱼类的出现可能与当时的海洋生态环境存在某种联系。但目前鱼类卵胎生的起源和环境关系还不清楚，需要进一步的研究。（云报全媒体 记者杨质高）

责任编辑：吴颜

文章关键词：
云南罗平 鱼类化石

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