The Manual adheres to the scope and sequence of most one major course nationwide also strives to make the PRACTICAL MANUAL OF DIVERSITY AND FUNCTION OF INVERTEBRATES&CHORDATS (ALLIED ZOOLOGY PRACTICAL-I) (A Revised Syllabus based on Periyar University) as a discipline, interesting and accessible to students. In addition to a comprehensive coverage of core concepts and foundational invertebrates &chordates and its importance features that draw learners into the discipline in meaningful ways. This Manual provides a fundamental concept of invertebrates & chordates with a scope that is manageable for instructors and students alike with this; it is my pleasure to write a brief foreword to this wonderful book on the text book of invertebrates & chordates.