Packet 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 (-5[1])Rynchobdellida (“ryne-kohb-DEH-lih-dah”) order of these animals lack a “jaw” and feed using a flattened, (-5[1])protrusible proboscis. (-5[1])When not in water, these animals typically perform a vermiform (*) crawling form of locomotion facilitated (-5[1])by their front and rear (-5[1])suckers. (-5[4])Many of these (10[1]-5[1])annelids (-5[1])inject (-5[1])hirudin (10[2])into (10[1])their hosts (10[9])to (10[1])inhibit (-5[1])thrombin (10[2])activity, (10[3])thereby preventing (10[2])coagulation. (10[8])For 10 points, what worms were historically used (10[1])in bloodletting? (10[1])■END■ (10[11])

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