Histochemical data indicate that the glue in Idiosepius,Euprymna, and S. tuberculata (Cyran and von Byern, 2010; Klinger et al., 2010; von Byern et al., 2010b) consists of a viscous carbohydrate-based gel as known in gastropods (Smith, 2002,
2006). Regardless of whether the glue in Nautilus is derived from the columnar cells alone or from all three cell types of the oral ridges, the histochemical results show that all cell types contain mainly neutral sugars and therefore the animals probably adhere via such a carbohydrate-based gel.