Fig. 8

a - Zoea IV, isosurface of micro-CT-scans showing the external pores of the dorsal organ (black arrowheads) between the attachment sites of the mandibular adductor muscles (circles). Asterisks indicate the attachment of single muscle bundles. Crossed arrows indicate the orientation (a - anterior, d – dorsal, p – posterior, v - ventral). b – Zoea IV, consecutive frontal semi-thin sections through the pores (arrowheads) of the dorsal organ (anterior is towards the top). Abbreviations: AA - anterior aorta, Cu - cuticle, DS - dorsal spine, Ey - compound eye, MA - mandibular adductor musculature, RS - rostral spine