Petrarca morula, antennules and mouthparts. A, right antennule, segments numbered. B, C, terminal (fifth) segments of right and left antennules respectively, lateral view. D, labrum, lateral view. E, mandible. F, maxillule. G, cutting edge of maxillule. H, maxillae. Abbreviations: ae, aesthetasc; cl, claw; clg, claw guard; ml, medial languette; mo, mouth opening; oe, oesophagus. Scale bars in µm.