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Genus: Jiangxispira Pan & al., 2003 † (DB: 1 SP)
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Jiangxispira yangouensis
Pan & al., 2003 † (FOSSIL)
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Genus: Laxella Pan & Erwin, 2002 † (DB: 1 SP)
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Laxella micra
Pan & Erwin, 2002 † (FOSSIL)
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Genus: Mapesella Bandel, 2002 † (DB: 1 SP)
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Mapesella meeki
(Knight, 1931 †) (FOSSIL)
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Genus: Streptacis Meek, 1871 † (DB: 12 SP)
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Streptacis complanata
Hoare & al., 1997 † (FOSSIL)
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Streptacis fragilis
Pan & Erwin, 2002 † (FOSSIL)
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Streptacis inflata
Erwin, 1988 † (FOSSIL)
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Streptacis ingens
Hoare & al., 1997 † (FOSSIL)
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Streptacis orientalis
A. Nützel & Nakazawa, 2012 † (FOSSIL)
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Streptacis permiana
(Beede, 1907 †) (FOSSIL)
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Loxonema permiana Beede, 1907 † =» Streptacis permiana
(Beede, 1907 †)
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Streptacis piercei
Erwin, 1988 † (FOSSIL)
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Streptacis pravis
Pan & Erwin, 2002 † (FOSSIL)
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Streptacis regularis
Pan & Erwin, 2002 † (FOSSIL)
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Streptacis scalpta
Knight, 1931 † (FOSSIL)
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Streptacis subgracilis
(Netschajew, 1894 †) (FOSSIL)
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Loxonema subgracilis Netschajew, 1894 † =» Streptacis subgracilis
(Netschajew, 1894 †)
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Streptacis whitfieldi
F.B. Meek, 1871 † (FOSSIL)
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