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FIGURE 1. Location of northern Estonia. The area of Arachnostega gastrochaenae Bertling localities in the Ordovician of northern Estonia is marked with red.

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FIGURE 2. Stratigraphic distribution and abundance of Arachnostega gastrochaenae Bertling in the Ordovician gastropods of Estonia.

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FIGURE 3. 1. Arachnostega gastrochaenae Bertling in a gastropod from Haljala Regional Stage (Sandbian), Aluvere Quarry, northern Estonia. GIT 399-948-1. 2. Arachnostega gastrochaenae Bertling in a gastropod from the Kunda Regional Stage (Darriwilian), Kunda Ojaküla, northern Estonia. GIT 404-355-1. 3. Arachnostega gastrochaenae Bertling in a bivalve from the Haljala Regional Stage (Sandbian), Aluvere Quarry, northern Estonia. GIT 399-1590-1. 4. Arachnostega gastrochaenae Bertling in a bivalve from the Haljala Regional Stage (Sandbian), Aluvere Quarry, northern Estonia. GIT 399-1601-1. 5. Arachnostega gastrochaenae Bertling in a cephalopod from the Uhaku Regional Stage (Darriwilian), Püssi, northern Estonia. GIT 695-12-1.

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FIGURE 4.Arachnostega gastrochaenae Bertling in a hyolith from Kukruse Regional Stage (Sandbian), Harku, northern Estonia. GIT 696-15-1.

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