Fig. 6

Scanning electron micrographs of larvae of Oligobrachia haakonmosbiensis. a. Panoramic view of a larva showing two ciliary rings, the anterior prototroch (pt) and the posterior telotroch (tt), and the ventral ciliary band, neurotroch (nt). b. The same from the dorsal side. c. The extremely anterior tip of a larva showing the prototroch and no apical tuft. d. One chaeta on the larval opisthosoma. e. Two chaetae on the larval opisthosoma. f. Cilia (arrows) around the apical bulge. g. High-magnification inset of the bottom of (a) showing the bilobed pigidium with one cilium on each lobe (arrows). h. Clumped cilia (arrowhead) on the dorsal side of the larva behind the prototroch. i. Solitary cilia scattered through the body of the larva (arrow). Abbreviations: ab – apical bulge, nt – neurotroch, pt – prototroch, tt – telotroch