systématique

Systématique, or systematics in English, is the scientific study of the diversity of life and the relationships among organisms. It encompasses taxonomy—the naming, description, and classification of organisms—and phylogenetics, the investigation of their evolutionary relationships. More broadly, the term denotes a rigorous, methodical approach to organizing knowledge and constructing systematic classifications in various disciplines.

Practices in systematics rely on data from morphology, anatomy, genetics, and genomics. Traditional taxonomy groups organisms based on shared characters, while cladistics emphasizes monophyletic groups through branching trees. Modern systematics often uses model-based phylogenetics to infer evolutionary trees, incorporating molecular sequences and whole-genome data. The naming of taxa follows nomenclature codes that regulate how organisms are formally described.

Historically, taxonomy emerged with Linnaeus’s binomial nomenclature and hierarchical classification. The development of cladistics by Willi Hennig in the mid-20th century reshaped thinking about evolutionary relationships. In recent decades, advances in DNA sequencing and computational methods have transformed systematics, enabling genome-scale analyses and more comprehensive phylogenies.

Applications of systematics include documenting biodiversity, informing conservation priorities, guiding ecological and biogeographic studies, and aiding paleontological research. Debates continue over concepts of species, the balance between rank-based taxonomy and clade-based nomenclature, and the integration of different data types. Systematics remains an evolving field at the interface of taxonomy and evolutionary biology.