Trichiurida

The order Trichiurida includes the following families of roundworms:

• Trichuridae, which includes whipworms
• Trichinellidae, which includes trichina worms

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All members of this order are histiotrophic, meaning that in at least one stage of their life cycle, they develop in cells or tissues. The anterior end is narrower than the posterior end in most of these worms, and the esophagus is slender and embedded in cells called stichocytes which form a stichosome. Eggs of members of this order have bipolar or biopercular plugs (except in a few species).