FIGURE 3 in The 20 Anniversary Of A Model Mite: A Review Of Current Knowledge About Archegozetes Longisetosus (Acari, Oribatida)

FIGURE 3: Schematic representation of different scenarios of genital system ontogenesis in Archegozetes longisetosus. Dorsal view, ontogenetic series top to bottom. Left column shows oviducts as anterograde developing coelomoducts following the 'classical' view of Goodrich (1945) and Anderson (1973). Right column shows an alternative description by Warren (1945), interpreting the oviducts as retrograde developing ectodermal invaginations. Middle column shows two scenarios derived from the information obtained in studies of A. longisetosus (Bergmann et al. 2008, Bergmann and Heethoff 2012b). It is unclear whether the oviducts derive from a fold at the rim of the gonocoel with a primary contact site at the ovary (a) or are retrograde developing tubular extensions with a secondary contact site at the ovary (b), and whether their lumen is primary (coelomic cavity) or secondary.