Figure 5
From: Two developmental switch points for the wing polymorphisms in the pea aphid Acyrthosiphon pisum
Histological comparisons of wing primordial development/degeneration among morphs. (a) Wingless male; (b) winged male; (c) wingless viviparous female; (d) winged viviparous female; (e) oviparous female; (f) fundatrix. Transverse planes of second to third thoracic segment are shown. Wing primordia in wingless viviparous females and wingless males degenerate during postembryonic development. Primordia are not observed in fundatrices and oviparous females. Ordinal numbers indicate the nymphal stadia (instars).