slipper limpet
noun
1- a mollusc which has an oval shell with an internal ledge, giving the empty shell a slipper-like appearance履螺, 履贝。〈北美〉亦称BOAT SHELL.
1.1
- Genus Crepidula, family Crepidulidae, class Gastropoda: many species, especially the North American C. fornicata, which has become a serious pest of oyster beds in Europe.履螺属, 履螺科, 腹足纲, 多种, 尤指北美拱形履螺, 它已成为欧洲牡蛎养殖场的一种严重的有害生物。