polygenesis; polyphylesis
Technical term in biology referring to the origin of a taxon from multiple ancestral lineages, as opposed to monophylesis.
The concept of polygenesis is an important topic of debate in phylogenetics.
polygenesis
Compound of 多 (many), 原 (origin), and 発生 (genesis, development). The exact historical derivation is uncertain; the term is a modern scientific coinage.