holometabolizm

Holometabolism (Polish: holometabolizm) is a developmental pattern in which an insect passes through four distinct life stages: egg, larva, pupa, and adult. In holometabolous lineages, the larval form typically specializes in feeding and growth, often with morphology and ecology very different from the adult, while the adult stage focuses on reproduction and dispersal. The pupal stage is a non-feeding, transformative phase during which larval tissues are broken down and reorganized into adult organs and structures, such as wings. The process is hormonally regulated, with ecdysone triggering molts and juvenile hormone levels controlling the timing and nature of the molts.

Holometabolism is one of three major insect metamorphosis patterns, alongside hemimetabolism (incomplete metamorphosis) and ametabola. In hemimetabolous insects, nymphs resemble small adults and molt gradually without a pupal stage; in holometabolous species, the larva and adult occupy different ecological niches, reducing competition for resources between life stages.

Most insect orders with high species richness are holometabolous, including Lepidoptera (butterflies and moths), Coleoptera (beetles), Diptera (flies), and Hymenoptera (bees, wasps, ants). The strategy is linked to rapid diversification and wide ecological distribution, contributing to the dominance of holometabolous insects in many environments.