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TABLE 1. Occurrence of Arachnostega in the Aluvere Quarry (Sandbian).

Taxa

Total number of specimens

Number of specimens with Arachnostega

Gastropoda

506

60 (12%)

Bivalvia

106

28 (26%)

Cephalopoda

70

13 (19%)

Hyolitha

16

3 (19%)

TABLE 2. Distribution of Arachnostega in gastropods from the Ordovician (global stages) of Estonia.

Stage

Total gastropods

Gastropods with Arachnostega

Katian

282

8 (3%)

Sandbian

765

85 (11%)

Darriwilian

93

16 (17%)

TABLE 3. Arachnostega diameter in gastropods in the Ordovician of Estonia.

Stage

Arachnostega burrows diameter in gastropods

Katian

0.35-1.14 mm (N=7, Mean 0.55, sd 0.28)

Sandbian

0.22-1.00 mm (N=37, Mean 0.57, sd 0.23)

Darriwilian

0.24-1.37 mm (N=15, Mean 0.76, sd 0.34)

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