| 11. | Septal necks are straight, making the siphuncle orthochoanitic.
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| 12. | Septal necks are strongly recumbent; connecting rings thick, with inflated bullettes.
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| 13. | Septal necks are cyrtochoanitic, outwardly curved and recumbent.
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| 14. | Septal necks are short and abruptly recurved along brims.
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| 15. | Septal necks are short, brims long and recumbent.
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| 16. | Septal necks are short, narrowly rounded or sharply recurved, but never recumbent.
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| 17. | Septal necks flare outwardly and unlike " Oocerina ", are empty.
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| 18. | Connecting rings are thick, septal necks cyrochoanitic to recumbent, bullettes markedly swollen.
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| 19. | Septal necks of the siphuncle are straight, suborthochoanitic, nearly reaching he previous septa.
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| 20. | The pseudorthocerids are thought to be distinct because their protoconch and septal necks are so different.
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