DNA Barcoding in Animals for Integrative Taxonomy and Biodiversity

DNA barcoding has been accepted as one of the exceptional methods in biodiversity and integrative taxonomy studies, which offers a molecular approach to the discovery and classification of species. This technique analyzes a standardized segment of the gene encoding for mitochondrial cytochrome c oxidase I (COI) enzyme to enable precise and efficient species recognition. Thus, DNA barcoding facilitates ecological studies, conservation efforts, and biodiversity assessment. Integrating other taxonomic approaches with DNA barcoding improves the reliability and resolution of species classification, clarifies phylogenetic relationships, and helps uncover cryptic species. The practical application of DNA barcoding in several animal taxa is highlighted by various case studies, indicating the utility of this technique in supporting the legal framework for the protection of wildlife and monitoring of ecosystem health. Thus, this technique is a powerful tool for exploring animal diversity, driving more effective strategies for conserving the biological heritage of this planet. This chapter focuses on the methodologies, principles, and application of DNA barcoding in animals, highlighting its role in linking traditional taxonomy and modern molecular techniques.