Answer to Case 631

 Answer: Trichuris trichiura (whipworm), male

As nicely pointed out by Florida Fan, "No, this worm is not so straight. It’s totally so convoluted like the whip of “Dr. Jones” in the movie . Such a beautiful sample with all the identification details including that curved tail and copulatory spicule specific to its sex. No trick, just Trichuris trichura. This is a classic case."

Here are some of the key identifying features:

The male is slightly smaller than the female; males are 3.0 to 4.5 cm long, while females are 3.5 to 5.0 cm long. Note that the head is at the skinny end - not what you might think!