Source / 来源: 讲解手册/珍奇柜-颌展签五审_0923.pdf
Page / 页码: 7
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。

奇迹秀山鱼
最早的完整保存有颌脊椎动物
奇迹秀山鱼生活于约 4.36 亿年前的志
留纪早期，全长约 3 厘米，属于早期
盾皮鱼类。它具有宽阔的头甲、发达
的背棘和覆盖细小鳞片的躯干，身体
背腹扁平，鳍和尾部结构保存完整。
奇迹秀山鱼的头甲融合了多个盾皮鱼
类群的特征，并呈现出向硬骨鱼类头
顶骨片构型转变的若干特点。它的发
现将完整有颌脊椎动物的化石记录向
前推进了约 1100 万年，表明有颌脊椎
动物在早志留世已经发生了显著的多
样化，为认识有颌类早期身体构型与
演化提供了关键证据。
Xiushanosteus mirabilis
The Earliest Complete Gnathostome Vertebrate Fossil
Xiushanosteus mirabilis was a tiny jawed vertebrate that 
lived in the Early Silurian. Measuring approximately 3 
centimetres in total length, it had a broad, semicircular 
head shield and a short trunk enclosed by dermal armour. 
Its body was dorsoventrally flattened, with paired fins and a 
nearly complete tail preserved in remarkable detail.The 
dermal skeleton of Xiushanosteus mirabilis combines 
features found in several major placoderm groups. The 
discovery of complete specimens—pushing back the fossil 
record of complete jawed vertebrates by approximately 11 
million years—provides direct evidence that jawed 
vertebrates had already undergone substantial 
morphological diversification early in their evolutionary 
history and offers an unprecedented view of their early 
body plans.