The book Invertebrate Embryology and Reproduction covers the theoretical and practical goals of studying the descriptive embryology of invertebrates as well as discussions of reproduction in these animal groups. It covers the embryology of invertebrate animals, from the protozoa to the protochordates, echinodermata, and tunicates, and it explains various morphological and anatomical expressions in the field. These groups include medically significant invertebrates, economic arthropods, and economically significant aquatic invertebrates like crustaceans. The taxonomy of the species or phylum under discussion comes before each chapter so that the reader can find the systematic position. Brings together hard-to-find research data from the field, not only in Egyptian libraries but globally, and previously found through specialized references not widely available. Covers phylum definition, general characteristics, classification, reproduction, agametic reproduction, gametic reproduction, spawning, fertilization, development, and embryogenesis. Includes recent findings in the area, along with detailed figures and photos that illustrate important concepts. Clarifies descriptions with striking photos and electron microscopical studies of different species.