Round 9: Tossup 21

These animals’ ganglial structure features T-, P-, and N-neurons innervating S cells and non-spermatogenic Leydig cells. A. L. Willard discovered that these animals enhance their swimming ability when immersed in a solution containing serotonin. These animals’ Ozobranchus genus exclusively parasitizes green sea turtles. Members of the Rynchobdellida (“ryne-kohb-DEH-lih-dah”) order of these animals lack a “jaw” and feed using a flattened, protrusible proboscis. When not in water, these animals typically perform a vermiform (*) crawling form of locomotion facilitated by their front and rear suckers. Many of these annelids inject (-5[1])hirudin into their hosts (10[2])to inhibit thrombin activity, thereby preventing coagulation. For 10 points, what worms were historically used in bloodletting? ■END■ (10[1])

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Summary