Abstract
After completing a histological study of an endoparasitic rhabdocoel from the Pacific Coast sea urchin, Strongylocentrotus franciscanus, the following conclusions have been reached:1. This parasite belongs to the rhabdocoel family Umagillidae but differs in certain characteristics from the eight known genera of the family.2. The distinguishing characteristics are a single intestine, paired and lobed ovaries and testes, a tubular single-walled cuticular penis stylet, and cuticular ducts connecting the bursa seminalis to the bursal canal and seminal receptacle.3. A characteristic structure typical of this parasite and not present in other genera of the family is the bursal valve composed of two cuticular tubes, the insemination canal and proximal end of the bursal canal, which enter the bursa seminalis through a cuticular cup-like sheath.4. The parasite here described is given the name Syndisyrinx franciscanus, gen. et sp. nov.
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