Invertebrate is a complete, trusted, and engaging textbook whose comprehensive coverage makes it an invaluable resource for both undergraduate courses and professional research. The 3rd edition has been widely praised for its detailed classifications, high-quality illustrations, and coverage of contemporary debates in the field. The 4h edition will continue to feature recent scholarship and current perspectives, while streamlining the text to improve accessibility for intro-level students. Also, Gonzalo Giribet will join as a coauthor, contributing his perspective as a systematist to the text's approach to phylogenetics.