[VFB] One for the biologists!

[Wes Wada]

Into another phase on the research I am doing, and wish to streamline 
things if at all possible.  I am looking these up one at a time, but 
help would be appreciated.

The Question:  Which of the following biological families would contain 
creatures eaten by trout?

Many thanks,
Wes Wada
Bend, Oregon
Echinoderms
Acteonidae
Angariidae
Atyidae (Haminoeidae)
Bullidae
Cypraeidae
Fissurellidae
Hydatinidae
Marginellidae
Muricidae
Neritidae
Ovulidae
Phasianellidae
Stomatellidae
Strombidae
Triviidae
Trochidae
Turbinidae
Volutidae
Dentaliidae
Limidae
Malleidae
Pteriidae
Veneridae
Solpugids
Palpigrads