Source / 来源: 讲解手册/珍奇柜-活化石展签五审_0923.pdf
Page / 页码: 23
Material / 材料类型: exhibit_context
Text extraction / 提取方式: native

Source transcription; wording is retained as supplied. OCR may contain recognition errors; consult the PDF/image.
来源转录；保留原展签措辞。OCR可能包含识别误差，请核对PDF或图像。

长背鳍燕鲟
现代鲟形鱼类的远古近亲
燕鲟是一类生活于早白垩世淡水湖泊中
的早期鲟形鱼类，体长可达约45厘米。其
最显著的特征是异常延长的背鳍，背鳍
具有大量鳍条，形成独特的身体构型。与
现代鲟形类相比，燕鲟保留了更多早期
鲟形鱼类的骨骼特征，并在鳍条等结构
中保存了一些古老特征。该类群为研究
鲟形鱼类早期演化、身体结构变化及淡
水生态适应提供了重要证据。
Yanosteus longidorsalis
An Ancient Relative of Modern Sturgeons
Yanosteus was an early acipenseriform fish that inhabited 
freshwater lakes during the Early Cretaceous and reached 
approximately 45 cm in length. Its most distinctive feature 
was an exceptionally elongated dorsal fin composed of 
numerous fin rays, forming a unique body configuration. 
Compared with modern acipenseriform fishes, Yanosteus
retained more ancestral skeletal features of early 
acipenseriforms and preserved primitive characteristics in 
structures such as its fin rays. This taxon provides 
important evidence for understanding the early evolution, 
morphological transformation, and freshwater ecological 
adaptations of acipenseriform fishes.