#evolutionism

• Agriotype — An ancestral primitive, wild, or native form of a plant or animal species, considered the original type from which cultivated varieties and modern domesticated breeds developed through artificial selection, hybridization, or domestication. It represents the structural genetic reference in the study of taxonomic evolution.
• Anagenesis — A macroevolutionary mechanism or process characterized by the linear and progressive evolution of a single phyletic lineage, wherein an entire species undergoes structural and genetic transformations accumulated over time, gradually transforming into a new species without branching. This evolutionary phenomenon, opposite to cladogenesis, involves the complete replacement of the old gene pool through continuous adaptation to the environment, leading to the emergence of superior morphological and physiological traits.
• Ancestor — A rare scientific term or neologism used as a direct equivalent for ancestor, original ascendant, or primordial organism from which a phylogenetic lineage or modern species evolved. In a biological structural sense, it represents the starting point in a cladogram or evolutionary tree.
• Aristogenesis — An idealistic evolutionary theory, formulated by paleontologist Henry Fairfield Osborn, stating that the evolution of living organisms is determined by the gradual emergence of new, superior adaptive genes and characters directly from the internal potential of the germ plasm, independent of natural selection or the direct influence of the environment. In modern biology, the term is considered historical, describing a predetermined biological improvement mechanism.
• Aromorphic — Pertaining to aromorphosis; relating to a major evolutionary shift or characterized by a profound morphophysiological transformation that increases structural complexity. As a noun, it denotes the newly acquired anatomical trait that enhances adaptive capacity.
• Aromorphosis — A primary direction or mechanism in the progressive evolution of living systems (introduced by Alexey Severtsov) consisting of the acquisition of major, complex morphophysiological changes that raise the general level of organismal organization.