Source / 来源: 讲解手册/珍奇柜-活化石展签五审_0923.pdf
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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。

Atractosteus tristoechus
An Ancient Gars Lineage Surviving Today
The Cuban gar is one of the larger representatives of the
family Lepisosteidae and one of the most ancient lineages 
of living ray-finned fishes. It has an elongated body, an 
extended snout, and densely arranged sharp teeth, with 
the entire body covered by hard rhomboid ganoid scales, 
displaying the distinctive adaptations of gars. The Cuban 
gar is an ambush predator that primarily feeds on fishes 
and other aquatic animals. Its swim bladder contains a 
rich network of blood vessels and can function as an 
accessory respiratory organ, allowing it to tolerate 
low-oxygen aquatic environments. Gars have a long 
evolutionary history, first appearing in the Mesozoic, and 
have retained many distinctive morphological features. 
They provide important insights into the evolutionary 
history and ecological adaptations of ray-finned fishes.
银杏类植物（化石银杏类）
穿越亿年的扇形叶
银杏类植物是一支古老的裸子植物谱
系，在中生代曾广泛分布于全球陆地生
态系统，并在侏罗纪和白垩纪达到繁盛。
约1.7亿年前的银杏类化石已经具有与
现代银杏相似的扇形叶结构及部分生殖
特征，展示了这一类群长期保守的形态
特征。通过研究银杏化石，可以了解古植
物群落组成、裸子植物演化以及中生代
陆地生态系统的变化。
Ginkgoales
Fan-Shaped Leaves Across Deep Time
Ginkgoales represent an ancient lineage of gymnosperms 
that were widely distributed in terrestrial ecosystems during 
the Mesozoic and reached their greatest diversity during 
the Jurassic and Cretaceous. Fossil ginkgoaleans from 
approximately 170 million years ago already possessed 
fan-shaped leaves and some reproductive features similar 
to those of modern ginkgo, demonstrating the long-term 
morphological conservatism of this lineage. The study of 
fossil ginkgoaleans provides important insights into ancient 
plant communities, the evolution of gymnosperms, and 
changes in Mesozoic terrestrial ecosystems.