Hearts of chelicerates.

<p>A: Heart of <i>Limulus polyphemus</i> (lateral view, μCT). B: Heart of <i>Hottentotta hottentotta</i> (dorsal view, cLSM). C: Ostium and proximal part of cardiac artery of <i>Euscorpius tergestrinus</i> (lateral view, cLSM; red cyan anaglyph, use goggles), arrowhead indicates longitudinal fibers of the epicard. D: Ostium and proximal part of cardiac artery of <i>Lasiodora parahybana</i> (lateral view, cLSM), arrowhead indicates longitudinal fibers of the epicard. aa: anterior aorta; ca: cardiac artery; os: ostium; pa: posterior aorta.</p>