| 21. | The horseshoe crab is an arthropod of the family Limulidae.
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| 22. | The horseshoe crabs have been swimming in the Earth's waters for 400 million years.
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| 23. | The other three extant species in the family Limulidae are also called horseshoe crabs.
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| 24. | I read about the horseshoe crabs and their medical products.
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| 25. | In a world so grim, compared to horseshoe crabs, Darrell became a school dropout.
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| 26. | The aquarium participates in the annual Nantucket Horseshoe Crab Survey.
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| 27. | The same behavior can be seen in modern horseshoe crabs.
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| 28. | Although most arthropods have mandibles, the horseshoe crab is jawless.
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| 29. | They feed on horseshoe crabs, clams, mussels and other invertebrates.
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| 30. | Horseshoe crabs have barely changed from their 200 million-year-old ancestors.
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