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云南罗平中三叠世辐鳍鱼下纲干群一新种:尼尔森翼鳕

发表日期:2014-11-19来源:放大 缩小

编辑:徐光辉,沈辰辰,赵丽君

摘要:翼鳕(Pteronisculus)是辐鳍鱼下纲干群中一个已绝灭的属,以泪骨构成口缘为典型特征。直到最近,该属仅发现于欧洲、马达加斯加和北美的早三叠世地层;可能的中三叠世化石记录发现于斯匹次卑尔根岛。根据最近采自云南罗平中三叠世安尼期(242~247 Ma)海相地层中保存良好的化石标本,命名了翼鳕属一新种,尼尔森翼鳕(Pteronisculus nielseni sp. nov.)。该种代表了翼鳕属在亚洲的首次发现,它的发现为支撑三叠纪时期东、西特提斯洋之间存在生物交流的假说提供了新证据。另外,作为翼鳕属最晚的代表种之一,尼尔森翼鳕的发现表明翼鳕属在早三叠世末并没有灭绝,至少延续到中三叠世早期。
关键词:云南罗平生物群;中三叠世;辐鳍鱼亚纲,辐鳍鱼下纲

卷期:第52卷,第4期

 

Pteronisculus nielseni sp. nov., a new stem-actinopteran fish from the Middle Triassic of Luoping, Yunnan Province, China

 

XU Guang-Hui,  Shen Chen-Chen Zhao Li-Jun

 

Abstract  Pteronisculus is a genus of extinct marine stem-actinopteran fishes, characterized by the lachrymal contributing to the oral margin. Until recently, it has been known only from the Early Triassic of Europe, Madagascar, and North America, and possibly from the Middle Triassic of Spitzbergen. Here, we report the discovery of a new species of this genus, Pteronisculus nielseni sp. nov., on the basis of 12 well-preserved specimens from the Middle Triassic (Anisian, 242–247 Ma) marine deposits in Luoping, Yunnan Province, China. The new species is the first record of Pteronisculus in Asia, providing new evidence to support the Triassic biological exchanges between the eastern and western Palaeotethys Ocean. Moreover, as one of the youngest members of Pteronisculus, the new finding provides convinced evidence to support that Pteronisculus lived through the Early Triassic and survived at least at the early stage of the Middle Triassic.

Key words  Luoping Biota, Yunnan, China; Middle Triassic; Actinopterygii, Actinopteri

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