🦴 化石This P. paradoxissimus specimen at the Copenhagen Zoological Museum was described by Carl Linnaeus
照片: FunkMonk · CC BY-SA 3.0 · Wikimedia Commons 原文件
三叶虫
Paradoxides davidis (Trilobite (Paradoxides) · 三葉虫)
仅见于化石的物种。IUCN红色名录仅评估公元1500年以来生存或灭绝的物种，因此无评估等级。
💡 用日常生活实例看体型·体重·速度
- 📏 体长 45cm — 约为A4纸长边(29.7厘米)的 1.5倍
- 🧍 体长 45cm — 约为A4纸长边(29.7厘米)的 1.5倍
参考基准：大巴车约12米、中型轿车约4.9米、小型汽车约1吨、篮球筐3.05米、银行卡8.56厘米等通用规格。
📖 1. 概览
古生代统治海洋约2亿7,000万年的代表性标准化石。
🌐 Wikipedia 摘要摘录Paradoxides is a genus of large to very large trilobite found throughout the world during the Middle Cambrian period. One record-breaking specimen of Paradoxides davidis, described by John William Salter in 1863, is 37 cm (15 in). The cephalon was semicircular with free cheeks ending in long, narrow, recurved spines. Eyes were crescent shaped providing an almost 360° view, but only in the horizontal plane. Its elongate thorax was composed of 19–21 segments and adorned with longish, recurved pleural spines. Its pygidium was comparatively small. Paradoxides is a characteristic Middle-Cambrian trilobite of the 'Atlantic' (Avalonian) fauna. Avalonian rocks were deposited near a small continent called Avalonia in the Paleozoic Iapetus Ocean. Avalonian beds are now in a narrow strip along the East Coast of North America, and in Europe.
🦴 2. 身体结构与特征
三叶虫拥有由方解石（碳酸钙）晶体构成晶状体的复眼，属于保存为化石的最古老眼睛之一。
🔍 3. 化石记录与古生态
在二叠纪末大灭绝时从地球上彻底消失。
🇰🇷 4. 与韩国的关联
在江原道太白、宁越的古生代朝鲜超群地层中发掘出大量三叶虫化石。
📚 来源与参考资料
- • Wikipedia “Paradoxides”
- • Wikidata Q7134471
- • Fossil taxon — the IUCN Red List assesses only species living or extinct since 1500
- • 剪影: PhyloPic — Charles Doolittle Walcott (vectorized by T. Michael Keesey) · Public Domain Mark 1.0 (近缘分类群剪影 — Olenellus thompsoni)
数值为公开文献中广泛引用的代表性估计值，可能因研究或个体而异。