"Axial Character Seriation in Mammals: An Historical and Morphological Exploration of the Origin, Development, Use, and Current Collapse of the Homolog" by Aaron G. Filler is a comprehensive academic textbook that delves into the fascinating world of axial character seriation in mammals. The book meticulously examines the historical development of this concept, tracing its origins and evolution through the lens of comparative anatomy and evolutionary biology. Through a rich exploration of morphological data, Filler unravels the complexities of axial character seriation, highlighting its critical role in understanding the development and adaptation of mammalian forms. He skillfully analyzes the use of this concept in diverse scientific fields, showcasing its profound implications for evolutionary studies, developmental biology, and paleontology. The book culminates in a thought-provoking analysis of the current "collapse" of the homolog, investigating the challenges faced by this concept in modern research and its potential future trajectory. This meticulously crafted textbook offers a nuanced and insightful perspective on axial character seriation, making it an indispensable resource for students, researchers, and anyone seeking a deeper understanding of mammalian evolution and comparative anatomy.