Fig. 1

SEM micrographs of Pyrrhosoma nymphula larva. a-d Head capsule e-j. Mouthparts a. Frontal view b. Ventral view c. Lateral view d. Dorsal view e. Maxilla, dorsal view f. Mandible, ventral view g. Mandible, dorso-lateral view h. Maxilla, median view i. Maxilla, lateral view j. Labium, dorsal view. Abbreviations: acl – anteclypeus, antb – antennal base, ce – compound eye, ca – cardo, cl – cleavage line, dse – dentisetae, eh – end hook, fl – flagellum, fr – frons, inc – incisivi, lac – lacinia, lb. – labium, lbr – labrum, lp – labial palp, ls – labial sutur, loc – lateral occellus, ma – membranous area, mh – movable hook, ml – median lobe, mo – mola, moc – median occellus, mp – maxillar palpus, oc – occiput, ocr – occipital ridge, pcl – postclypeus, pe – pedicellus, pm – postmentum, poc – post occiput, por – postoccipital region, prm – praementum, sc – scapus, set – setae, st – stipes