Fig. 4From: Catostylus tagi: partial rDNA sequencing and characterisation of nematocyte structures using two improvements in jellyfish sample preparationNematocytes of C. tagi viewed with Masson’s trichrome staining using optical microscopy. Arrows highlight operculum. Collagenous materials in green or blue. Red colour is attributed to cationic proteins. a and b Euryteles; shaft stained in red and around it a green material filling the capsule. c Undefined nematocyst with a green material filling the core. d Birhopaloid, all stained in red due to its tubule which fulfills the inner capsule. Bars: (a and b) 5 μm; (c and d) 4 μmBack to article page