Question
ट्राइलोबाइट की आकारिकी और भूवैज्ञानिक इतिहास की चर्चा कीजिए।
Answer :
Word Count : 495
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ट्राइलोबाइट प्राचीन समुद्री जीवों में से एक हैं, जो आर्थ्रोपोडा (Arthropoda) समूह से सम्बंधित हैं। उनका शरीर कठोर बाहरी कवच द्वारा ढका होता था, जिसे चिटिन और कैल्शियम कार्बोनेट के मिश्रण से बना माना जाता है। आकारिकी दृष्टि से ट्राइलोबाइट का शरीर तीन मुख्य भागों में विभाजित होता है – सिरभाग (Cephalon), मध्य भाग या छाती (Thorax), और अंतिम भाग या पुच्छ (Pygidium)। सिरभाग में प्रमुख आँखे होती थीं, जो कई लेंसों वाले युग्मित दृष्टि अंग थे, और अक्सर जटिल आकृतियों के साथ सज्जित होती थीं। इसके अलावा सिरभाग में संवेदन अंग और जबड़े जैसे संरचनाएँ भी पाई जाती थीं। छाती में कई शरीरखंड होते थे, जिनकी संख्या प्रजातियों के अनुसार भिन्न होती थी, और ये शरीरखंड केंद्रीय अक्ष के चारों ओर लचीले ढांचे
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