Evidence that more than a third of Paleozoic articulate brachiopod genera (Strophomenata) lived infaunally

Steven M. Stanley
The Strophomenata, which includes two large orders, the Strophomenida and Productida, was the largest group of Paleozoic brachiopods. Nearly all uncemented strophomenatans possessed an unusual concave brachial valve. Most of these animals have been considered to have lived epifaunally, but had they rested on the sea floor, not only would they have faced intense predation, but their physical instability would have been fatal. I conclude that nearly all strophomenatans, like similar, concavo-convex pectinid bivalves, lived...
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These counts follow the COUNTER Code of Practice, meaning that Internet robots and repeats within a certain time frame are excluded.
What does this mean?