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Cyrtolites is an extinct genus of monoplacophorans in the family Cyrtolitidae.Names brought to synonymy Cyrtolites elegans S.A. Miller 1874, a synonym for Phragmolites elegans

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Helcionopsis is an extinct genus of paleozoic monoplacophoran in the family Tryblidiidae.

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Helcionopsis radiatum is an extinct species of paleozoic monoplacophoran in the family Tryblidiidae.

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Helcionopsis striata is an extinct species of paleozoic monoplacophoran in the family Tryblidiidae.

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Pilina is an extinct genus of paleozoic monoplacophorans in the family Tryblidiidae.

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Pilina solarium is an extinct species of a paleozoic Silurian monoplacophoran. It was first named as Palaeacmaea solarium and described by Gustaf Lindström from Silurian of Gotland in Sweden in 1884.

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Pilina unguis is an extinct species of Paleozoic Silurian monoplacophoran. It was first named as Tryblidium unguis and described by Gustaf Lindström in Latin from the Silurian deposits of Gotland in Sweden, in 1880.

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Tryblidiidae is an extinct family of paleozoic monoplacophorans in the superfamily Tryblidioidea.

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Tryblidium is a paleozoic genus of Ordovician and Silurian monoplacophorans.

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Tryblidium reticulatum is an extinct species of a paleozoic Silurian monoplacophoran.