Avian-symbionts
Guides
Astigmata
Astigmata is a diverse suborder of mites characterized by the absence of stigmata (respiratory openings) and tracheal systems. The group encompasses three major ecological radiations: permanent ectosymbionts of birds (feather mites), inhabitants of decaying organic matter and stored products, and parasites of vertebrates and arthropods. Feather mites represent the most species-rich component, with three superfamilies (Analgoidea, Pterolichoidea, Freyanoidea) colonizing all feather types of birds worldwide. Many non-feather-associated lineages exhibit a specialized dispersal stage, the heteromorphic deutonymph (hypopus), adapted for phoretic transport on arthropods. The suborder shows remarkable morphological and ecological diversification, with life cycles ranging from entirely host-bound to complex multi-habitat strategies.