Healing of wounds in the foot of Siphonaria petinata (Linne) was compared with healing vertebrates and in other molluscs. Wounds were two mm long and one mm deep. Animals were maintained in the laboratory in artificial sea water at 25C and were observed and sectioned at intervals for 28 days. Within one day, the wound filled with fluids, leucocytes and debris. Within two days, leucocytes formed a cot against the damaged muscle tissues. By the eighth day, some repair tissue had formed and epithelium covered most of the wound surface. Epithelium and supporting tissues regenerated within 18 days. Muscle and granulated cells had partially regenerated within 28 days. Healing of wounds in S. pectinata is more similar to healing in prosobranch molluscs than to healing in bihalves or in vertebrates.
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