English: An Anastrophia internascenslampshell, Order Pentamerida, Family Parastrophinidae, 31mm along the axis, brachial valve, collected at the Waldron Shale, Indiana, USA, from the Middle Silurian (Homerian). Note the two symetrically positioned epibionts of the species Cornulites proprius, tentatively classified as Phylum Mollusca, Class Tentaculita, Order Cornulitida, Family Cornulitidae
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