Long-solid (Fusconaia subrotunda) In 1831, Isaac Lea described the longsolid, a medium-sized mussel, up to five inches long, which potentially live up to 50 years. It is found in small streams to large rivers, and prefers a mixture of sand, gravel, and cobble substrates. The mussel is found in Alabama, Kentucky,... FWS Focus Species Kingdom Animalia Taxonomic Rank Species