Fig. 13

Frontal histological sections of Zoea IV (Holländer stain). a - section through the median part of the cardiac stomach (CS), see Fig. 2c for section plane; b - higher magnification of the cardiac stomach with the gastric mill that comprises two lateral teeth (LT) and one median tooth (MT), note the thickened cuticle of the teeth as indicated by black arrowheads; c - higher magnification of the antennal gland; c` - the bladder (BL) of the antennal gland opens to the outside through a nephropore (No). Abbreviations: AA - anterior aorta, AC - anterior caecum, AG - antennal gland, Bl - bladder, CEC - circumoesophageal connective, CMsc - contractor muscles of the cardiac stomach, CoeSac - coelomosac, CS - cardiac stomach, CSac - cardiac sac, DG - digestive gland, DGM - dorsal gastric muscles, Eso - oesophagus, LT - lateral tooth, Ly - labyrinth, MA - mandibular adductor musculature, Md - mandible, MdP – mandibular palp, MT - median tooth, No - nephropore, TC – tritocerebrum