Figure 1. Mouth apparatus of Cherax quadricarinatus. A, line drawing of the head region giving a medial view of the left side of the mouth apparatus. Striated area indicates sectioned tissue. Position of mouthparts resembles the live animal when not eating. B, labrum seen ventrally. Ch. quadricarinatus is the only species with setae on the labrum. C, left mandible seen dorso-laterally. All species have a heavy setation on the mandibular palp with the major part on the distalmost segment. D, left maxilla 1 seen dorsally. Most setae are found on the medial rim. E, left maxilla 2 seen dorsally. The scaphognathite has a setal rim but most of the other setae are found on the medial edge of the basis and coxa. (F) left maxilliped 1 seen dorsally. Most setae are found on the exopod and the medial rim of the basis and coxa. (G) left maxilliped 2 seen dorsally. Most setae are on the medial side of the endopod and on the exopod. (H) left maxilliped 3 seen dorsollay. The medial side of the endopod has heavy setation. Abbreviations Bas, basis; Cox, coxa; Endo, endopod; Epi, epipod; Exo, exopod; IP, incisor process; Lb, labrum; Mdp, mandibular palp; MP, molar process; Mx1, maxilla 1; Mx2, maxilla 2; Mxp1, maxilliped 1; Mxp2, maxilliped 2; Mxp3, maxilliped 3; Scapho, scaphognathite.