Source / 来源: 讲解手册/珍奇柜-脊梁骨展签五审_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。

文昌鱼
脊索动物活化石
文昌鱼体长约50毫米，身体侧扁、半透
明，两端尖细，外形似鱼，但没有明显的
头部、头骨和脊椎。其脊索沿身体背侧
纵贯全身，并一直延伸至体前端。文昌
鱼保留了脊索、背神经管和咽鳃裂等脊
索动物的基本身体结构，是研究脊索动
物身体构型及脊椎动物早期演化的重
要现生参照。
Branchiostoma
A Living Fossil of the Chordates
Branchiostoma is a small, translucent marine 
cephalochordate about 50 mm long. Its body is laterally 
compressed and tapers at both ends, giving it a fish-like 
appearance. However, it lacks a distinct head, cranium, 
and vertebral column. Instead, a notochord extends nearly 
the full length of the body and reaches its anterior tip. It 
also retains key features of the basic chordate body plan, 
including a notochord, a dorsal hollow nerve cord, and 
numerous pharyngeal slits. As a living representative of 
Cephalochordata, Branchiostoma provides an important 
comparative reference for understanding the chordate 
body plan and the early evolution of vertebrates.