Fig. 14

Frontal histological sections of Zoea IV (Holländer stain). a - section of the cephalothorax with the cardiac stomach (CS) in the centre. Dorsally, the paired anterior caeca (AC) are located. Ventrally the oesophagus (Eso) opens to the mouth field, laterally flanked by the mandibles (Md); compare Fig. 2c for section plane; b - posterior part of the cardiac stomach with sclerotized lateral teeth (LT). Ventrally, the ventral gastric muscles are attached (VGM). c - details of the pyloric stomach with gastric mill. d - higher magnification of the sclerotized mandible (Md), note the massive cuticle (Cu) of the molar process (MP); e - detail of the dilatator muscles (DMsc) attached to the oesophagus (Eso). Abbreviations: AA - anterior aorta, AC - anterior caecum, AG - antennal gland, AR - ampullary ridge, ASS - ampullary setal screen of the gland filter, CEC - circumoesophageal connective, CMsc - dilatator muscles of the cardiac stomach, CS - cardiac stomach, Cu - cuticle, DG - digestive gland, DGM - dorsal gastric muscles, DLC - dorsolateral pyloric channel, DMsc - dilatator muscles of the oesophagus, DPC - dorsal region of the pyloric chamber, DPF - dorsal pyloric fold, Eso - oesophagus, FP - filter press, IAR - interampullary ridge, IP – incisor process, LAC - lower ampullary chamber, MA - mandibular adductor musculature, Md - mandible, MdP – mandibular palp, MP – molar process, MT - median tooth, PPO - prepyloric ossicle, PSS - pyloric setal screen, UAC - upper ampullary chamber, VGM – ventral gastric muscle