| 1. | The suture is with shallow ventral, lateral, and dorsal lobes.
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| 2. | Sutures are close spaced laterally, but with broad ventral and dorsal lobes.
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| 3. | Sutures are straight ventrally but have dorsal lobes.
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| 4. | Its suture has a distinct ventral and dorsal lobe and an angular lateral saddle.
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| 5. | Additional sutural elements are two umbilical, an inner lateral and a dorsal lobe.
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| 6. | The caudal fin has a strong ventral lobe and undulations on the dorsal lobe margin.
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| 7. | Sutures form slight lateral lobes, dorsal lobes, and broad ventral and umbilical saddles.
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| 8. | Sutures have shallow ventral and dorsal lobes.
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| 9. | The suture is with ventral and dorsal lobes, the siphuncle very close to the venter.
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| 10. | Its noseleaf has long dorsal lobe with stiffened central ridge and broad convex flaps on the sides.
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