FIGURE 1. Location of northern Estonia. The area of Arachnostega gastrochaenae Bertling localities in the Ordovician of northern Estonia is marked with red.
FIGURE 2. Stratigraphic distribution and abundance of Arachnostega gastrochaenae Bertling in the Ordovician gastropods of Estonia.
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.
FIGURE 4.Arachnostega gastrochaenae Bertling in a hyolith from Kukruse Regional Stage (Sandbian), Harku, northern Estonia. GIT 696-15-1.
