Cranial veins of the remora, Echeneis naucrates, post-perfusion with iodixanol (blue). (a) Lateral view. (b) Dorsolateral view, disc digitally removed. ACS, anterior cardinal sinus; DA, dorsal aorta; DC, ductus Cuvieri; DCV, dorsal collector vein; OS, orbital sinus; SV, sinus venosus. (c) Diagram of transverse view or remora cranium at mid-orbit, left lamellae is depressed, right lamellae is erected. CE central erector muscle; D, depressor muscle; LE, lateral erector muscle; ME, medial erector muscle; SP, spinules. In this orientation, spinules are not visible on the depressed lamellae. An interactive model of the micro CT scan is available both as a 3D PDF in Supplementary Materials and online here: https://skfb.ly/6oLuR.