| 1. | Despite their rich fossil record with thousands of described hypostome.
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| 2. | Many variations in shape and placement of the hypostome have been described.
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| 3. | Partly because of this, and partly because of their rather indistinct hypostome.
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| 4. | Variation in trilobite hypostome morphology is crucial in modern discussions of trilobite phylogeny.
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| 5. | It includes three hypostome that creates an indention superior to the gastric cavity.
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| 6. | The hypostome, a small rigid plate comparable to the ventral plate in other arthropods.
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| 7. | The " hypostome " is inserted and this provides the initial attachment strength.
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| 8. | Functional interpretations of hypostome shape also allow for reasonable speculation on the feeding habits of trilobite species.
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| 9. | Of particular interest are " macula ", the small areas of thinned cuticle on the underside of the hypostome.
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| 10. | A toothless mouth and stomach sat upon the hypostome with the mouth facing backward at the rear edge of the hypostome.
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