Fig. 1

External morphology of Pycnophyes kielensis. SEM micrographs, specimens are oriented with the anterior end upwards, numbers indicate segment numbers and the scale bars equal 10 µm. a Dorsal view of P. kielensis with four dorsal placids, partly everted introvert, eleven trunk segments, and lateral terminal spines. b Ventral view of a female with everted mouth cone and the scalid bearing introvert, 11 segments of the trunk and lateral terminal spines. c Mouth cone with outer oral styles, introvert with primary spinoscalids of the primary scalid ring, spinoscalids of the subsequent rings, as well as trichoscalids of ring 07. d Dorsal view of segments 8 and 9 with sensory spots. e Ventral view of segments 3 and 4 with cuticular hairs and setae in lateral and ventral position. ch cuticular hairs, in introvert, lts lateral terminal spine, mc mouth cone, oos outer oral styles, pl placids, psc primary spinoscalids, sc scalids; se setae, ss sensory spot, tr trichoscalid