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

Figure H2-1. Water vascular system. (a) Longitudinal section of adult specimen’s aboral area, periproct, and madreporite. (b) Moderate-power magnification of (a) showing the madreporite. (c) Tangential section of the adult specimen's madreporite. (d) High-power magnification view of (c) showing the madreporite. (e) Longitudinal section of adult’s test ambulacral plate showing the arrangement of the tube foot, test ossicle, and ampullae. (f) Tangential section of adult’s tube foot, ampullae, and piece of nerve cord shown. (g) Longitudinal section of juvenile specimen’s test showing the arrangement of the tube foot, test ossicle, and ampullae. (h) Tangential section of juvenile specimen’s test showing the water vascular system; the relationship to the tube foot, tubes within the ossicle connecting to the ampullae and radial water vessel. Note that sphaeridia shown with the surrounding nerve ring in this photomicrograph. Ampu = ampullae; Arrow = nerve ring; Arrow head = sphaeridia; Go = gonad; Mad = madreporite; NC = nerve cord; Os = ossicle; Pproct = periproct; RWV = radial water vessel; TF = tube feet.

Credit: Yasunari Kiryu, FWC/FWRI