Figure 4
From: Induced metamorphosis in crustacean y-larvae: Towards a solution to a 100-year-old riddle
'Plump' type ypsigon escaping from the y-cyprid. Ypsigon escaping from the y-cyprid after 28 hours exposure to 20-hydroxyecdysone. This 'plump' type of ypsigon differs from the more elongated forms shown in Figures 1–3 and Additional files 1, 2, 3, 4, 5. It illustrates that the different 'species' of y-larvae recognized from molted naupliar skins (exuviae) is at least to some extent matched by variations in the shape of the juvenile ypsigon stage.