Fig. 10

Muscles of the opisthosomal chaetae in the competent larva of Siboglinum fiordicum. Surface rendering in AMIRA of the longitudinal muscles of the first septum between trunk segment and the first segment of the opisthosoma. Musculature is shown in red; nuclei stained with DAPI as well as autofluoresce of the opisthosomal chaetae are shown in yellow. A Ventral view from the inside the larva body; B, E ventral view of the left side from the inside the larva body; C, F the same fragment from the outside; D, G ventral view of the right side from the inside. co—opisthosomal chaetae; mcch1-3—circular muscles of the chaetal apparatus, mlch1-10—longitudinal muscles of the chaetal apparatus, mls—longitudinal muscles of the first septum, mvvl—ventral component of the ventrolateral longitudinal muscle strand, moc1-2—the first and the second circular muscle bundles in the opisthosoma, mv—ventral longitudinal strand