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The collar is diaphragmatic in Bockiella, but vestibular in the flustrellidrids. Lophophores are similar among the investigated species with a rejection tract in the flustrellidrids. The digestive tract shows differences in the extent and proportions of the caecum, which is large in the flustrellidrids and small in Bockiella; the anus is vestibular in all species. A funicular muscle of variable location is present in each species. Elzerina binderi has additional thin strands emanating from the digestive tract to the body wall. The parie
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