George Gaylord Simpson's "Principles of Classification and a Classification of Mammals" (AMNH Bulletin v. 85, 1945) was the original source for the taxonomy listed here. Simpson laid out a systematics of mammal origins and relationships that was universally taught until the end of the 20th century. Since Simpson's classification, the paleontological record has been recalibrated, and the intervening years have seen much debate and progress concerning the theoretical underpinnings of systematization itself, partly through the new concept of cladistics. Though field work gradually made Simpson's classification outdated, it remained the closest thing to an official classification of mammals.
সিম্পসন স্তন্যপায়ী প্রাণীর উৎসের পদ্ধতিগুলি স্থাপন করেছিলেন এবং কোন শতাব্দীর শেষ পর্যন্ত সর্বজনীনভাবে শেখানো হয়েছিল?
20th