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

Figure H5-1. Gastrointestinal system. (a) Mouth. (b) Pharynx, vertically run through the Aristotle’s Lantern. (c) Junction of esophagus and pharynx at the Aristotle’s Lantern (pharynx not shown in this photograph). (d) Cross-section of the esophagus. (e) Longitudinal section of the esophagus. (f) Esophagus abundant with mucus; cells line the lumen of the esophagus. (g–i) Small intestine with less abundant mucus cells. (j–l) The nonglandular enterocytes line the large intestine. (m–o) Rectum. (p and q) Aboral area showing periproct or anus. Arrow = madreporite; Esoph = esophagus; LI = large intestine; Mo = mouth; Phrnx = pharynx; Pproct = periproct; Rect = rectum; SI = small intestine; TC = tooth coelom.

Credit: Yasunari Kiryu, FWC/FWRI