Order Tetraphyllidea Scolex with 4 bothridia (leaflike muscular structure); vitellaria located in lateral margins of proglottids; genital pores lateral; parasites of elasmobranchs; about 200 species. Order Lecanicephalidea Reproductive system similar to Tetraphyllidea, but scolex divided into an upper disklike or globular part and a lower collarlike…
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