Don't know if this helps but -
During the early Paleozoic, epifaunal and primitive infaunal siphonate suspension feeding was the most common bivalve life mode. Infaunal siphon feeders appeared in the middle and late Paleozoic, but they gained prominence after the Permo-Triassic extinctions. The infaunal and epifaunal forms increased in diversity throughout the Mesozoic until the Cretaceous-Tertiary extinction event, when the epifaunal suspension feeders were decimated. During the Cenozoic, the infaunal siphonate clams continued to diversify. The labial palp deposit feeders and the mucus-tube builders evolved early in the Paleozoic and remained relatively unaffected by the extinctions and diversifications of the remainder of the class.
Clarkson, ENK (1993) Invertebrate Palaeontology and Evolution [4th ed.]. Chapman and Hall, 434 pp.