University of FloridaSolutions for Your Life

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

Figure G6-1. Gastrointestinal tissues. (a) Esophagus connects at the Aristotle’s lantern and axial organ. (b) Small intestine connects to the esophagus junction. (c) Large and small intestine. (d) High-magnification view of the large intestine and orientation to the gonad and small intestine. (e) Extracted view of the rectum and head process ( = aboral diverticulum) which connects to axial organ. (f) Periproct and madreporite. (g) Transition between small intestine and large intestine. AL = Aristotle’s lantern; Arrow = axial organ; Dashed arrow = head process; Esoph = esophagus; Go = gonad; LI = large intestine; Mad = madreporite; Pproct = periproct; Rect = rectum; SI = small intestine.

Credit: Yasunari Kiryu, FWC/FWRI