| 1. | The species has a black spot on the upper opercular margin.
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| 2. | One difference between the two species is their opercular flap.
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| 3. | The convergently evolved an opercular structure during the Early Cretaceous to Paleocene.
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| 4. | A black opercular spot is prominent and often extends onto the shoulder.
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| 5. | The opercular lobe is winged on each side.
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| 6. | The most commonly used techniques involve counting natural growth rings on the opercular series.
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| 7. | One of his major discoveries was the homology of the opercular plates of the nemesis.
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| 8. | Sources could also include one from the right opercular part of the inferior frontal gyrus.
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| 9. | The foot is large but narrow, broad anteriorly, with conspicuous opercular lobes behind.
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| 10. | Small openings to the mouth and opercular cavities of the male are maintained on both sides.
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