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VM244: Diagnostic Methods for the Comprehensive Health Assessment of the Long-Spined Sea Urchin, Diadema antillarum

Figure G4. Hemal system. (a) In situ view showing location of the axial organ at the aboral side. (b) Extracted axial organ. (c) In situ view showing location of axial organ at the Aristotle’s Lantern and esophagus connection area. (d) Extracted axial organ. (e) In situ view showing location of hemal vessel attached to the large intestine. (f) Extracted hemal vessel attached to the small intestine. AL = Aristotle’s lantern; Arrow = hemal vessel; Arrow head = axial organ; Esoph = esophagus; Go = gonad; LI = large intestine; Rect = rectum; SI = small intestine.

Credit: Yasunari Kiryu, FWC/FWRI